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  Coating Ring-down Measurement Lab elog, Page 15 of 18  Not logged in ELOG logo
ID Date Author Type Category Subject
  181   Sun Nov 13 10:11:19 2016 GabrieleGeneralNoise huntingNoise due to air

The plot below compares the QPD signal spectra in different configurations (roughing pump on/off, air on/off).

The noise below ~<2kHz is making very hard to measure the Q of the first mode at 1100 Hz

The main source of noise are the clean air filters. I switched them to minimum for the moment being.

  180   Sat Nov 12 09:49:07 2016 GabrieleGeneralMeasurements12 substrates ready for Montreal

The 12 following substrates have been measured and are ready for the first coating experiment in Montreal:

  179   Sat Nov 12 09:39:46 2016 GabrieleGeneralMeasurementsS1600468

2016-11-12

  • 9:39am, in chamber, balanced
  • 9:39am, roughing pump on
  • 9:52, turbo pump on
  • 12:14pm, excitation: first band passed around 1100 Hz (using filter bank FM5) with amplitude 3kV, then usual broadband with amplitude 3 kV
    • quiet time after 1163016908
  • 2:50pm, excitation as above, quiet time before  1163026243, quiet time after 1163026429
  • 3:28pm, the previous excitations didn't work very well, done anothe one. Quiet time after 1163028556
  • 7:09pm, another excitation (3kV, 30s). Quiet time before 1163041791, quiet time after 1163041952. This is good
  • 9:04pm, another excitation (3kV, 60s). Quiet time before 1163048623, quiet time after 1163048849

2016-11-13

  • 10:00am pumps off

Results

2016-11-12 A

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1107.0        1.2271e+07        1.2230e+07        1.2313e+07
2538.2        6.7299e+06        6.7276e+06        6.7322e+06
2580.0        1.0201e+06        1.0045e+06        1.0363e+06
4420.2        3.3946e+06        3.3932e+06        3.3961e+06
4488.3        3.4539e+05        3.4499e+05        3.4579e+05
6742.6        3.4664e+06        3.4654e+06        3.4674e+06
6756.0        1.2338e+07        1.2297e+07        1.2379e+07
6820.8        2.7783e+06        2.7774e+06        2.7792e+06
9496.3        8.6303e+05        8.6269e+05        8.6338e+05
10183.4        1.0287e+06        1.0276e+06        1.0299e+06
12672.0        6.7333e+05        6.7053e+05        6.7615e+05
14139.4        4.5748e+06        4.5636e+06        4.5860e+06
16039.5        1.6091e+06        1.6057e+06        1.6126e+06
16053.5        8.2144e+06        8.2061e+06        8.2228e+06
16273.4        1.4619e+06        1.4573e+06        1.4666e+06
18594.2        5.2728e+05        5.2726e+05        5.2729e+05
20185.4        6.2639e+05        6.2637e+05        6.2641e+05
20243.0        4.9019e+05        4.9017e+05        4.9020e+05
23511.8        5.6831e+05        5.6830e+05        5.6832e+05
24645.2        5.2455e+05        5.2454e+05        5.2456e+05
25430.0        9.6495e+05        9.6493e+05        9.6497e+05
28797.5        1.8557e+06        1.8557e+06        1.8558e+06
28898.6        2.0557e+06        2.0417e+06        2.0699e+06
28996.1        3.8089e+06        3.7871e+06        3.8310e+06
29501.6        4.9763e+05        4.9762e+05        4.9764e+05
29575.6        2.9382e+06        2.9381e+06        2.9382e+06
31293.5        7.5105e+05        7.5104e+05        7.5106e+05

2016-11-12 B

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
2538.3        6.6590e+06        6.6535e+06        6.6646e+06
4420.1        3.3867e+06        3.3854e+06        3.3880e+06
4488.3        3.5406e+05        3.5393e+05        3.5419e+05
6742.6        3.4635e+06        3.4583e+06        3.4687e+06
6756.0        1.4419e+07        1.4103e+07        1.4750e+07
6820.9        2.7751e+06        2.7729e+06        2.7773e+06
9496.3        8.1276e+05        8.1239e+05        8.1313e+05
10183.4        1.0124e+06        1.0091e+06        1.0157e+06
11422.5        7.7922e+04        7.7919e+04        7.7926e+04
12672.0        6.6570e+05        6.6414e+05        6.6727e+05
14139.4        5.3701e+06        5.3570e+06        5.3832e+06
16039.5        1.7203e+06        1.7179e+06        1.7227e+06
16053.5        8.2568e+06        8.2438e+06        8.2699e+06
16273.4        1.4714e+06        1.4656e+06        1.4773e+06
18225.0        7.3060e+05        7.3058e+05        7.3062e+05
18594.2        5.3148e+05        5.3147e+05        5.3150e+05
20185.1        6.3606e+05        6.3604e+05        6.3607e+05
20243.1        4.9319e+05        4.9317e+05        4.9320e+05
23511.7        5.9188e+05        5.9187e+05        5.9189e+05
24251.5        5.1792e+05        5.1791e+05        5.1793e+05
24645.2        5.1672e+05        5.1671e+05        5.1674e+05
27387.0        2.8928e+05        2.8927e+05        2.8929e+05
28797.6        2.0240e+06        2.0239e+06        2.0240e+06
28898.6        2.0321e+06        2.0198e+06        2.0446e+06
28996.1        3.7763e+06        3.7127e+06        3.8421e+06
29473.0        2.5233e+05        2.5233e+05        2.5233e+05
29575.6        2.8365e+06        2.8364e+06        2.8365e+06
31293.4        7.5482e+05        7.5481e+05        7.5483e+05
31924.4        2.0841e+06        2.0840e+06        2.0841e+06
32187.5        1.0967e+06        1.0967e+06        1.0967e+06
  178   Fri Nov 11 16:38:23 2016 GabrieleGeneralMeasurementsS1600466

2016-11-11

  • 4:36pm, in chamber, balanced
  • 4:38pm roughing pump on
  • 4:48pm turbo pump on
  • 7:30pm excitation (2kV, 30s), quiet time before 1162956576+30s, quiet time after 1162956694+30s
  • three more excitation planned during the night`
    • Quiet time before excitation: 1162968737
      Excitation at 1162968781 (30 s)
      Excitation finished
      Quiet time after excitation: 1162968811

    • Quiet time before excitation: 1162979641
      Excitation at 1162979685 (30 s)
      Excitation finished
      Quiet time after excitation: 1162979715

    • Quiet time before excitation: 1162990545
      Excitation at 1162990589 (30 s)
      Excitation finished
      Quiet time after excitation: 1162990619

  • Those excitation didn't go through (I'll have to figure out what the problem wth the real time model is...)

2016-11-12

  • 7:15am, another excitation (2-3 kV, 30s). Quiet time before 1162998878, quiet time after 1162999026

  • 9:04am, pumps stopped

Results

2016-11-11

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1090.5        1.6675e+07        1.6206e+07        1.7172e+07
2501.2        1.1191e+07        1.1163e+07        1.1220e+07
2542.4        4.0691e+05        4.0503e+05        4.0880e+05
4355.2        7.2116e+06        7.2078e+06        7.2154e+06
4423.9        1.5223e+05        1.5221e+05        1.5225e+05
6644.0        4.3292e+06        4.3171e+06        4.3413e+06
6653.5        2.0495e+07        2.0453e+07        2.0537e+07
6722.2        1.6917e+06        1.6891e+06        1.6944e+06
9359.2        3.9201e+06        3.9166e+06        3.9236e+06
10191.7        2.0209e+06        1.9986e+06        2.0438e+06
12490.8        2.5034e+06        2.4804e+06        2.5268e+06
13931.5        1.1993e+07        1.1964e+07        1.2022e+07
15805.0        1.8647e+06        1.8485e+06        1.8812e+06
15811.9        1.1364e+07        1.1336e+07        1.1393e+07
16043.3        1.7186e+06        1.7092e+06        1.7280e+06
18284.5        8.9726e+05        8.9723e+05        8.9728e+05
18497.9        1.0294e+06        1.0208e+06        1.0381e+06
23172.4        4.9055e+06        4.8967e+06        4.9144e+06
24848.5        1.8458e+06        1.8458e+06        1.8458e+06
25987.0        7.9809e+06        7.7772e+06        8.1957e+06
26683.2        1.1400e+07        1.1386e+07        1.1415e+07
28376.3        6.5734e+06        6.5135e+06        6.6345e+06
28473.4        3.8361e+06        3.7811e+06        3.8928e+06
28568.4        1.3993e+07        1.3893e+07        1.4094e+07
30095.6        1.3830e+07        1.3633e+07        1.4032e+07
30952.0        3.3822e+06        3.3822e+06        3.3823e+06
31828.1        2.6835e+06        2.6834e+06        2.6835e+06
32406.5        2.0068e+06        2.0067e+06        2.0068e+06

2016-11-12

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1090.5        1.8006e+07        1.5301e+07        2.1867e+07
2501.0        1.0560e+07        1.0530e+07        1.0590e+07
2542.5        4.4638e+05        4.4567e+05        4.4710e+05
4355.2        7.1326e+06        7.1296e+06        7.1356e+06
4424.1        1.6117e+05        1.5314e+05        1.7008e+05
6644.0        4.5510e+06        4.5445e+06        4.5576e+06
6653.5        2.1827e+07        2.1806e+07        2.1848e+07
6722.2        2.1486e+06        2.1473e+06        2.1500e+06
9359.2        2.2299e+06        2.2212e+06        2.2388e+06
10191.7        2.1281e+06        2.0397e+06        2.2245e+06
12362.5        3.7022e+06        3.7021e+06        3.7024e+06
12490.9        2.7104e+06        2.6974e+06        2.7236e+06
13931.6        1.2366e+07        1.2325e+07        1.2408e+07
15805.1        1.8549e+06        1.8481e+06        1.8617e+06
15811.9        1.1797e+07        1.1776e+07        1.1819e+07
16043.4        2.5330e+06        2.5192e+06        2.5469e+06
18498.0        8.0772e+05        8.0770e+05        8.0774e+05
22735.0        8.2479e+06        8.2477e+06        8.2481e+06
23172.5        5.0380e+06        5.0154e+06        5.0608e+06
24301.0        1.8758e+06        1.8758e+06        1.8759e+06
24848.3        2.3044e+06        2.3043e+06        2.3044e+06
25987.0        7.6224e+06        7.6223e+06        7.6226e+06
26322.0        1.0341e+06        1.0341e+06        1.0341e+06
26683.4        1.1224e+07        1.1194e+07        1.1254e+07
28473.5        3.8882e+06        3.8157e+06        3.9636e+06
28568.5        1.4189e+07        1.4141e+07        1.4237e+07
29067.6        4.7110e+05        4.7110e+05        4.7111e+05
30095.4        1.3861e+07        1.3739e+07        1.3986e+07
30951.9        3.4868e+06        3.4626e+06        3.5112e+06
31828.0        2.9665e+06        2.9352e+06        2.9985e+06
32406.0        2.2123e+06        2.2123e+06        2.2124e+06

 

  177   Fri Nov 11 10:29:57 2016 GabrieleGeneralMeasurementsS1600454

Note: Marked at "damaged?" by Alena

2016-11-11

  • 10:28am, in chamber, balanced
  • 10:29am, roughing pump started
  • 10:42am, turbo pump started
  • 12:50am, excitation 2kV, 30s , quiet time before 1162929094+30s, quiet time after 1162929206+30s
    • something happened after ~850 seconds...
  • 1:42pm, excitation 2kV, 30s, quiet time before 1162935703+30s, quiet time after 1162935801+30s
  • 3:07pm, pumps stopped

Results

2016-11-11 A

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1113.5        1.1749e+07        1.1593e+07        1.1908e+07
2553.4        4.0388e+06        4.0359e+06        4.0417e+06
4446.6        4.6170e+06        4.6141e+06        4.6199e+06
4514.3        2.9059e+05        2.9012e+05        2.9107e+05
6782.6        1.0254e+06        1.0241e+06        1.0266e+06
6801.5        1.9269e+06        1.9255e+06        1.9282e+06
6860.7        1.3774e+06        1.3769e+06        1.3779e+06
9552.2        1.9909e+06        1.9848e+06        1.9971e+06
10407.0        2.5039e+06        2.5001e+06        2.5078e+06
12746.0        1.1864e+06        1.1843e+06        1.1885e+06
14230.5        8.0322e+05        8.0158e+05        8.0486e+05
16141.9        6.6250e+05        6.5746e+05        6.6761e+05
16160.8        3.9976e+06        3.9902e+06        4.0050e+06
16367.6        1.4247e+06        1.4121e+06        1.4376e+06
18888.5        1.1559e+05        1.1559e+05        1.1560e+05
21839.5        1.0733e+06        1.0733e+06        1.0734e+06
23660.1        5.7483e+05        5.7481e+05        5.7484e+05
24786.0        8.8886e+05        8.8884e+05        8.8887e+05
25534.0        6.0001e+05        6.0000e+05        6.0002e+05
27247.3        1.2955e+06        1.2955e+06        1.2956e+06
28977.5        1.2581e+06        1.2581e+06        1.2581e+06
29076.5        1.2993e+06        1.2934e+06        1.3052e+06
29342.0        1.2664e+06        1.2664e+06        1.2665e+06
31088.0        4.7656e+05        4.7655e+05        4.7657e+05
31713.0        1.6862e+06        1.6862e+06        1.6862e+06

2016-11-11 B

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1113.5        4.6063e+06        4.5931e+06        4.6196e+06
2553.5        4.8384e+05        4.7913e+05        4.8864e+05
2594.3        6.9375e+05        6.9006e+05        6.9748e+05
4446.5        3.6254e+06        3.6244e+06        3.6265e+06
4514.3        2.8637e+05        2.8360e+05        2.8918e+05
6782.7        1.6890e+06        1.6826e+06        1.6954e+06
6801.5        3.6093e+06        3.5426e+06        3.6786e+06
6860.7        1.3362e+06        1.3356e+06        1.3368e+06
9552.2        1.6879e+06        1.6392e+06        1.7395e+06
10407.1        2.6518e+06        2.6339e+06        2.6699e+06
12746.1        1.1566e+06        1.1388e+06        1.1750e+06
14230.6        8.4460e+05        8.3550e+05        8.5390e+05
16142.0        6.0038e+05        6.0036e+05        6.0039e+05
16160.9        3.5967e+06        3.5844e+06        3.6090e+06
16367.8        1.0885e+06        1.0782e+06        1.0991e+06
27247.6        1.1635e+06        1.1039e+06        1.2299e+06
28977.8        1.2100e+06        1.2100e+06        1.2100e+06
29076.9        1.7618e+06        1.7392e+06        1.7851e+06
29186.8        3.2163e+06        3.2162e+06        3.2164e+06
29341.5        1.0715e+06        1.0714e+06        1.0715e+06
29680.0        1.1609e+06        1.1608e+06        1.1609e+06
31976.4        1.0149e+06        1.0149e+06        1.0149e+06

 

Attachment 5: spectra.png
spectra.png
  176   Thu Nov 10 17:04:05 2016 GabrieleGeneralNoise huntingTemporary second QPD

This morning I installed temporarily a second QPD to monitor the input beam. The goal was to understand where the vibrations at frequencies below 2kHz couple from. As shown in the photo, the second QPD was close to the first one.

The signals in the two QPDs were quite different, and the coherence between them wasn't great. So I concluded that the main coupling path is not through input beam of QPD vibration, but more likely real motion of the disk.

I removed the additional QPD and restored the setup to its nominal configuration. The readout infrastructure is still in the model.

  175   Thu Nov 10 16:13:46 2016 GabrieleGeneralMeasurementsS1600450 again

Noticed a small chip on the side, marked as damaged

2016-11-10

  • 4:00pm, optical setup realigned to horizontal reference
  • 4:12pm, sample in chamber, balanced
  • 4:13pm, roughing pump on
  • 4:24pm, turbo pump on
  • 7:40pm excitation (2kV, 30 s), quiet time before 1162870778, quiet time after 1162870905
  • Three more excitations planned for the night
    • Quiet time before excitation: 1162886983
      Excitation at 1162887027 (30 s)
      Quiet time after excitation: 1162887057

    • Quiet time before excitation: 1162897887
      Excitation at 1162897931 (30 s)
      Quiet time after excitation: 1162897961

    • Quiet time before excitation: 1162908791
      Excitation at 1162908835 (30 s)
      Quiet time after excitation: 1162908865

 

2016-11-11

  • 7:50am pumps off

Results

2016-11-10 A

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1102.0        5.3024e+06        5.2839e+06        5.3211e+06
2527.2        2.9856e+06        2.9823e+06        2.9889e+06
2567.4        8.6286e+05        8.5588e+05        8.6995e+05
2788.4        4.6339e+06        4.5542e+06        4.7165e+06
4401.7        1.8540e+06        1.8535e+06        1.8545e+06
4467.4        2.2187e+05        2.2126e+05        2.2248e+05
6713.8        1.4683e+06        1.4679e+06        1.4688e+06
6724.1        6.5991e+06        6.5929e+06        6.6053e+06
6787.9        1.1469e+06        1.1464e+06        1.1474e+06
6853.4        1.1702e+05        1.1657e+05        1.1748e+05
9456.6        1.1755e+06        1.1751e+06        1.1759e+06
10293.0        1.7976e+05        1.7975e+05        1.7977e+05
12619.6        5.9997e+05        5.9686e+05        6.0312e+05
12741.1        2.0405e+05        2.0224e+05        2.0589e+05
14079.9        3.5517e+06        3.5500e+06        3.5535e+06
15976.5        8.4967e+05        8.4690e+05        8.5246e+05
16205.5        9.4038e+05        9.3824e+05        9.4252e+05
18518.2        4.1016e+05        4.0891e+05        4.1141e+05
20106.4        3.0991e+05        3.0990e+05        3.0991e+05
23418.5        1.6833e+06        1.6780e+06        1.6886e+06
25592.6        1.3253e+06        1.3253e+06        1.3254e+06
26956.2        1.3545e+06        1.3545e+06        1.3545e+06
28687.0        9.9537e+05        9.8974e+05        1.0011e+06
28776.0        1.0314e+06        1.0254e+06        1.0374e+06
28861.5        4.1845e+06        4.1844e+06        4.1846e+06
29732.6        1.0816e+06        1.0815e+06        1.0816e+06

2016-11-10 B

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1101.7        5.2606e+06        5.2430e+06        5.2782e+06
2527.4        2.9196e+06        2.9186e+06        2.9206e+06
2567.3        8.0586e+05        8.0324e+05        8.0850e+05
4401.8        1.8612e+06        1.8609e+06        1.8616e+06
4467.4        2.1847e+05        2.1824e+05        2.1869e+05
6713.8        1.4727e+06        1.4724e+06        1.4730e+06
6724.0        6.6231e+06        6.6191e+06        6.6271e+06
6787.9        1.1299e+06        1.1296e+06        1.1302e+06
6853.2        1.2340e+05        1.2273e+05        1.2408e+05
9456.6        1.1774e+06        1.1772e+06        1.1777e+06
14079.8        3.7293e+06        3.7020e+06        3.7570e+06
15976.3        9.2595e+05        9.2298e+05        9.2894e+05
16205.5        9.2283e+05        9.1471e+05        9.3111e+05
18518.1        3.9478e+05        3.9477e+05        3.9479e+05
23418.5        1.4435e+06        1.4305e+06        1.4567e+06
26956.3        4.3919e+06        4.3824e+06        4.4015e+06
28686.9        8.1295e+05        8.0911e+05        8.1682e+05
28776.0        9.3826e+05        9.3824e+05        9.3827e+05
28861.5        3.1460e+06        3.1028e+06        3.1903e+06

 

  174   Thu Nov 10 16:07:13 2016 Alena, CalumGeneralGeneralAnnealing run

Annealing run (466-471) on 3" wafers - Crime 11/10/2016

https://dcc.ligo.org/LIGO-T1600524

  173   Thu Nov 10 14:13:34 2016 gabrieleElectronicsConfigurationMATLAB code to control Thorlabs stages

To be used to automate the laser polishing.

Attachment 1: move_complete.m
function move_complete(varargin)
    global moving;
    moving = false;
end
Attachment 2: throlabs_activex.m
%% init the controllers
f1 = figure();
f2 = figure();
tstage = actxcontrol('MGMOTOR.MGMotorCtrl.1', [20 20 600 400], f1);
rstage = actxcontrol('MGMOTOR.MGMotorCtrl.1', [20 20 600 400], f2);
set(tstage, 'HWSerialNum', 27001029);
set(rstage, 'HWSerialNum', 27501183);
tstage.StartCtrl();
rstage.StartCtrl();

... 119 more lines ...
Attachment 3: animation.m
% try a sequence of movements

figure()

% laser position
a0 = acos(36/(75/2));  
laser = [-75/2*sin(a0), 75/2*cos(a0)];

% initial position
t = 0;
... 59 more lines ...
Attachment 4: draw_wafer.m
function draw_wafer(translation, angle, laser)
    d = 75; % diameter
    f = 36; % distance of flat from center
    
    a = acos(f/(d/2));  % half angle opening of the flat
    
    % build wafer in reference position and orientation
    phi = [linspace(a, pi-a, 100), linspace(pi+a, 2*pi-a, 100)];
    coordinates = [-d/2*cos(phi); d/2*sin(phi)]';
    coordinates(end+1,:) = coordinates(1,:);
... 25 more lines ...
  172   Thu Nov 10 10:03:17 2016 GabrieleGeneralMeasurementsS1600465

2016-11-10

  • 10:01am, in chamber, balanced
  • 10:03am, roughing pump on
  • 10:23am, turbo pump on
  • 12:16pm excitation (3kV, ~20s), quiet time before 1162844853, quiet time after 1162844912.
    • This was lost because the frame disk was full and the wiper.pl script was not running!!! The crontab was pointing to x1 instead of x3
    • I deleted some old frame files and updated the crontab. The problem should be fixed now
  • 1:50pm, excitation (3kV, ~30s), quiet time before 1162850776, quiet time after 1162850868
  • 2:50pm, excitation (1.9kV, ~30s), quiet time before 1162853341, quiet time after 1162853481
  • 3:40pm, pumps off

Results

Q's are low!

2016-11-10 A



% Freq        Q                Q (C.I. 95%)       Q (C.I. 95%)
1095.0        1.2015e+06        1.1994e+06        1.2036e+06
2472.1        1.2645e+06        1.2565e+06        1.2726e+06
2510.4        1.2525e+06        1.2519e+06        1.2531e+06
2548.4        7.3296e+05        7.3138e+05        7.3454e+05
2587.0        7.5560e+05        7.4510e+05        7.6639e+05
4371.3        1.0427e+06        1.0421e+06        1.0432e+06
4433.9        1.8185e+05        1.8162e+05        1.8209e+05
6667.0        8.1669e+05        8.1586e+05        8.1753e+05
6680.7        3.9680e+06        3.9658e+06        3.9703e+06
6739.0        1.0240e+06        1.0235e+06        1.0244e+06
6799.2        4.1092e+05        4.1047e+05        4.1137e+05
9388.7        7.9932e+05        7.9878e+05        7.9987e+05
10217.9        1.7660e+05        1.7609e+05        1.7713e+05
11445.0        5.8959e+04        5.8957e+04        5.8962e+04
12527.0        4.6659e+05        4.6255e+05        4.7070e+05
13982.6        1.1515e+06        1.1474e+06        1.1556e+06
15869.2        3.1943e+05        3.1778e+05        3.2111e+05
15877.7        3.0831e+05        3.0830e+05        3.0832e+05
16084.0        1.8992e+05        1.8991e+05        1.8992e+05
23254.4        1.8849e+05        1.8848e+05        1.8849e+05
26771.4        1.1868e+06        1.1776e+06        1.1960e+06
28495.1        3.9945e+05        3.9944e+05        3.9945e+05
28679.0        6.9279e+05        6.9278e+05        6.9280e+05

2016-11-10 B

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1095.0        1.1892e+06        1.1858e+06        1.1927e+06
2472.0        1.2834e+06        1.2655e+06        1.3017e+06
2510.4        1.2882e+06        1.2870e+06        1.2894e+06
2548.4        7.5857e+05        7.5706e+05        7.6009e+05
2558.0        5.0671e+05        4.6908e+05        5.5088e+05
2586.7        7.6939e+05        7.5984e+05        7.7918e+05
4371.3        1.0269e+06        1.0262e+06        1.0276e+06
4433.9        1.8067e+05        1.8050e+05        1.8085e+05
6667.0        8.1092e+05        8.0996e+05        8.1188e+05
6680.7        3.9209e+06        3.9199e+06        3.9219e+06
6739.1        1.0166e+06        1.0162e+06        1.0169e+06
6777.0        9.9454e+05        9.7718e+05        1.0125e+06
6799.4        4.1306e+05        4.1258e+05        4.1354e+05
9388.7        7.9169e+05        7.9094e+05        7.9243e+05
10218.0        1.7477e+05        1.7442e+05        1.7512e+05
11445.0        6.0272e+04        6.0269e+04        6.0274e+04
12526.8        4.6954e+05        4.6279e+05        4.7648e+05
13982.6        1.1871e+06        1.1852e+06        1.1889e+06
15869.4        3.5465e+05        3.5146e+05        3.5791e+05
15877.6        3.4842e+05        3.4841e+05        3.4843e+05
26771.5        1.7623e+06        1.7588e+06        1.7659e+06
28495.2        1.0461e+06        1.0343e+06        1.0582e+06
28679.3        2.5088e+06        2.5088e+06        2.5089e+06
Attachment 1: spectra.png
spectra.png
Attachment 2: peaks.png
peaks.png
  171   Wed Nov 9 16:25:21 2016 GabrieleGeneralMeasurementsS1600463

2016-11-09

  • 4:24pm, in chamber, balanced
  • 4:25pm, roughing pump on
  • 4:37, turbo pump on
  • 6:44pm: excitation 3kV, ~30s. Quiet time before 1162781217, quiet time after 1162781428
  • 9:12pm; excitation 3kV, ~30s, Quiet time before 1162789967, quiet time after 1162790079
  • two more excitations planned for the night

2016-11-10

  • 8:46am, pumps off

Results

2016-11-09 A

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1099.5        1.0066e+07        1.0046e+07        1.0086e+07
2521.9        5.7421e+06        5.7384e+06        5.7458e+06
4392.7        3.5549e+06        3.5484e+06        3.5613e+06
4458.8        1.1698e+05        1.1608e+05        1.1790e+05
6701.0        3.0215e+06        3.0192e+06        3.0239e+06
6719.8        1.1624e+07        1.1611e+07        1.1637e+07
6777.1        1.8900e+06        1.8890e+06        1.8910e+06
9438.3        2.4180e+06        2.4002e+06        2.4362e+06
10129.8        1.2106e+06        1.2093e+06        1.2120e+06
10284.4        1.3457e+06        1.3388e+06        1.3527e+06
12595.2        1.6405e+06        1.6305e+06        1.6507e+06
14065.3        8.5283e+06        8.5246e+06        8.5320e+06
15952.1        1.8901e+06        1.8839e+06        1.8964e+06
15966.8        7.1163e+06        7.1087e+06        7.1239e+06
16177.1        1.5698e+06        1.5615e+06        1.5782e+06
21197.9        6.1736e+06        6.1661e+06        6.1812e+06
23390.2        3.3534e+06        3.3460e+06        3.3608e+06
24497.3        1.4166e+06        1.4166e+06        1.4166e+06
25987.4        6.7031e+05        6.7029e+05        6.7032e+05
26935.8        3.9783e+06        3.9417e+06        4.0156e+06
28641.0        2.5059e+06        2.4891e+06        2.5229e+06
28845.9        4.8941e+06        4.8735e+06        4.9149e+06
29758.0        6.6465e+06        6.6350e+06        6.6580e+06

2016-11-09 B

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1099.5        9.7632e+06        9.7168e+06        9.8100e+06
2521.9        5.2682e+06        5.2631e+06        5.2733e+06
4392.7        3.3298e+06        3.3290e+06        3.3307e+06
4458.8        1.1263e+05        1.1219e+05        1.1307e+05
6700.9        2.8184e+06        2.8131e+06        2.8237e+06
6719.7        1.1530e+07        1.1520e+07        1.1540e+07
6777.1        1.8290e+06        1.8255e+06        1.8325e+06
9438.4        2.2950e+06        2.2714e+06        2.3191e+06
10129.8        1.1372e+06        1.1363e+06        1.1381e+06
10284.4        1.3204e+06        1.3176e+06        1.3231e+06
12595.2        1.5333e+06        1.5294e+06        1.5373e+06
14065.3        7.9394e+06        7.9358e+06        7.9431e+06
15952.1        9.8727e+05        9.8514e+05        9.8941e+05
15966.8        5.4806e+06        5.4721e+06        5.4892e+06
16177.1        1.5194e+06        1.5113e+06        1.5275e+06
23390.1        3.1415e+06        3.1342e+06        3.1489e+06
24497.0        1.3865e+06        1.3865e+06        1.3865e+06
26935.7        4.8356e+06        4.8222e+06        4.8491e+06
28641.0        2.3571e+06        2.3347e+06        2.3799e+06
28845.9        4.6321e+06        4.6008e+06        4.6638e+06
29757.9        4.3171e+06        4.2818e+06        4.3530e+06

 

  170   Wed Nov 9 15:32:11 2016 GabrieleGeneralNoise huntingNoise below 2 kHz is not due to the roughing pump, but to the clean air filters

The two spectra below show basically no difference (blue roughing pump on, red, roughing pump off)

Instead, below is another comparison: blue same as before, standard condition, red with one of the two clean air filters momentarily off. There is some clear improvement. The second filter is too hard to switch off!

  169   Wed Nov 9 09:56:50 2016 GabrieleGeneralMeasurementsS1600461

2016-11-09

  • 9:45am in chamber, balanced
  • 9:46am roughing pump on
  • 9:57am turbo pump on
  • 1:02pm: quiet time before excitation 1162760526, excitation ampl. 3kV, duration ~20s, quiet time after 1162760661
  • 2:25pm, another excitation, quiet time after 1162765583
  • 3:30pm, pumps off

Results

2016-11-08 A

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1112.3        1.5917e+07        1.5885e+07        1.5948e+07
1944.9        2.7053e+07        2.6225e+07        2.7935e+07
2512.9        5.8309e+05        5.8297e+05        5.8321e+05
2551.4        6.1779e+05        6.1606e+05        6.1953e+05
4444.4        6.9722e+05        6.9646e+05        6.9798e+05
4471.6        1.6717e+05        1.6715e+05        1.6719e+05
4502.5        5.2860e+04        5.2854e+04        5.2866e+04
4510.2        1.7001e+05        1.6995e+05        1.7008e+05
4518.0        5.2761e+04        5.2755e+04        5.2767e+04
4548.8        1.6907e+05        1.6906e+05        1.6909e+05
6741.5        1.6607e+06        1.6606e+06        1.6608e+06
6780.0        1.6527e+06        1.6523e+06        1.6531e+06
6803.6        9.9399e+06        9.9362e+06        9.9437e+06
6818.5        1.6635e+06        1.6633e+06        1.6636e+06
6856.0        1.2917e+06        1.2866e+06        1.2968e+06
9548.9        6.6037e+05        6.5927e+05        6.6147e+05
10252.2        1.1877e+07        1.1873e+07        1.1881e+07
10406.4        9.5454e+05        9.5449e+05        9.5458e+05
12742.3        2.5129e+05        2.5128e+05        2.5130e+05
14231.9        5.2480e+05        5.2478e+05        5.2482e+05
16143.0        2.1547e+06        2.1546e+06        2.1547e+06
16165.5        9.9736e+06        9.9305e+06        1.0017e+07
16324.1        2.0684e+06        2.0684e+06        2.0685e+06
16362.7        2.0847e+06        2.0838e+06        2.0857e+06
16401.2        2.0931e+06        2.0931e+06        2.0932e+06
18713.5        3.0002e+06        3.0001e+06        3.0002e+06
20305.5        3.7687e+05        3.7686e+05        3.7688e+05
20356.6        5.7487e+05        5.7486e+05        5.7488e+05
21448.8        5.5873e+06        5.5759e+06        5.5988e+06
23660.7        3.4572e+06        3.4454e+06        3.4690e+06
24779.6        6.1454e+05        6.1453e+05        6.1455e+05
27248.5        4.3485e+06        4.3485e+06        4.3486e+06
29080.9        3.2828e+06        3.2828e+06        3.2829e+06
29192.0        1.1073e+07        1.0994e+07        1.1153e+07
29668.3        1.1949e+06        1.1949e+06        1.1949e+06
31978.4        3.9904e+06        3.9904e+06        3.9905e+06

2016-11-09 B

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1112.3        1.5872e+07        1.5840e+07        1.5903e+07
1945.0        2.9329e+07        2.8527e+07        3.0177e+07
2224.4        1.6491e+07        1.6262e+07        1.6727e+07
2512.9        7.2946e+05        7.2513e+05        7.3384e+05
2551.5        7.7884e+05        7.7715e+05        7.8054e+05
4444.4        6.8441e+05        6.8422e+05        6.8459e+05
4471.6        1.7717e+05        1.7715e+05        1.7719e+05
4502.5        6.9790e+04        6.9783e+04        6.9798e+04
4510.3        1.7365e+05        1.7357e+05        1.7373e+05
4517.7        6.9972e+04        6.9964e+04        6.9980e+04
4548.8        1.7984e+05        1.7982e+05        1.7986e+05
6741.5        1.7916e+06        1.7915e+06        1.7917e+06
6780.0        1.8821e+06        1.8817e+06        1.8825e+06
6803.6        1.1061e+07        1.1050e+07        1.1071e+07
6818.5        1.8161e+06        1.8160e+06        1.8163e+06
6855.9        1.3496e+06        1.3472e+06        1.3521e+06
9549.0        6.6677e+05        6.6557e+05        6.6798e+05
10252.1        1.1961e+07        1.1945e+07        1.1977e+07
10406.4        9.8990e+05        9.8647e+05        9.9336e+05
12742.4        2.3726e+05        2.3725e+05        2.3727e+05
12829.0        3.7039e+05        3.7038e+05        3.7041e+05
12860.0        1.6576e+05        1.6576e+05        1.6577e+05
12867.9        3.7196e+05        3.6849e+05        3.7549e+05
12875.0        1.6658e+05        1.6657e+05        1.6658e+05
14231.9        5.1978e+05        5.1976e+05        5.1980e+05
16143.0        2.2069e+06        2.2068e+06        2.2069e+06
16165.5        1.0126e+07        1.0110e+07        1.0143e+07
16324.3        2.0036e+06        2.0035e+06        2.0036e+06
16362.7        2.0305e+06        2.0295e+06        2.0316e+06
16401.4        2.0320e+06        2.0319e+06        2.0320e+06
20356.7        5.8725e+05        5.8724e+05        5.8727e+05
21449.0        7.7227e+06        7.6377e+06        7.8096e+06
23660.8        3.2698e+06        3.2604e+06        3.2792e+06
24779.8        6.2124e+05        6.2123e+05        6.2125e+05
27248.5        4.2218e+06        4.2217e+06        4.2219e+06
29081.0        3.3153e+06        3.3152e+06        3.3153e+06
29192.1        1.0923e+07        1.0847e+07        1.1000e+07
29668.0        1.2406e+06        1.2406e+06        1.2407e+06
31978.4        3.5580e+06        3.5580e+06        3.5581e+06

 

Attachment 3: ringdowns.png
ringdowns.png
  168   Tue Nov 8 17:09:20 2016 GabrieleGeneralMeasurementsS1600460

2016-11-08

  • 5:08pm, in chamber, balanced
  • 5:09pm, roughing pump on
  • 5:18pm, turbo pump on
  • 7:56: excitation. Quiet time before excitation 1162698977, excitation ampl. 3kV duration ~30s, quiet time after 1162700079
  • Three more excitation planned for the night
    • Quiet time before excitation: 1162710917
      Excitation at 1162710961 (30 s)
      Quiet time after excitation: 1162710991

    • Quiet time before excitation: 1162721821
      Excitation at 1162721865 (30 s)
      Quiet time after excitation: 1162721895

    • Quiet time before excitation: 1162732725
      Excitation at 1162732769 (30 s)
      Quiet time after excitation: 1162732799

  • The last two automatic excitation didn't go through. It seems to be the same problem as yesterday (which I "solved" by restarting the models)

2016-11-09

  • 8:37am, pumps off

Results

2016-11-08 A

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1119.5        6.6404e+05        6.4444e+05        6.8484e+05
2504.0        5.3952e+06        5.3663e+06        5.4245e+06
2505.5        5.4008e+06        5.3791e+06        5.4226e+06
2510.6        1.0237e+06        9.9922e+05        1.0495e+06
2537.5        5.5690e+05        5.5679e+05        5.5701e+05
2545.0        9.5810e+05        9.5676e+05        9.5944e+05
2552.0        7.5631e+05        7.5616e+05        7.5646e+05
2582.3        1.0468e+06        1.0373e+06        1.0565e+06
3377.5        1.2974e+06        1.2972e+06        1.2975e+06
4361.5        2.9905e+06        2.9870e+06        2.9940e+06
4390.0        1.5871e+05        1.5869e+05        1.5873e+05
4428.9        1.6234e+05        1.6226e+05        1.6242e+05
4467.5        1.6373e+05        1.6371e+05        1.6375e+05
6653.7        3.0794e+06        3.0779e+06        3.0809e+06
6670.1        1.0338e+07        1.0326e+07        1.0350e+07
6730.4        1.4921e+06        1.4893e+06        1.4949e+06
6798.0        3.5459e+05        3.5456e+05        3.5461e+05
9372.3        2.1885e+06        2.1875e+06        2.1895e+06
10055.0        1.6518e+06        1.6517e+06        1.6519e+06
10210.3        2.7007e+05        2.7005e+05        2.7008e+05
12507.3        1.6391e+06        1.6391e+06        1.6392e+06
13961.7        7.0939e+06        7.0387e+06        7.1500e+06
15837.2        2.0382e+06        2.0365e+06        2.0399e+06
15850.6        5.9047e+06        5.8559e+06        5.9543e+06
16064.1        1.8247e+06        1.8246e+06        1.8247e+06
18532.6        3.1042e+05        3.1041e+05        3.1043e+05
18797.0        1.8528e+06        1.8527e+06        1.8528e+06
19983.2        1.3315e+06        1.3196e+06        1.3436e+06
21043.9        6.7756e+06        6.3946e+06        7.2047e+06
22640.6        2.6064e+06        2.6063e+06        2.6064e+06
23218.7        4.4360e+06        4.4359e+06        4.4361e+06
24331.4        1.2956e+06        1.2955e+06        1.2956e+06
26268.9        5.9110e+05        5.9109e+05        5.9111e+05
26740.4        3.9234e+06        3.9234e+06        3.9235e+06
28436.5        2.8936e+06        2.8858e+06        2.9014e+06
28636.0        2.4942e+06        2.4941e+06        2.4942e+06
29140.0        5.9494e+05        5.9493e+05        5.9495e+05
30906.6        2.0991e+06        2.0991e+06        2.0991e+06
32340.0        1.9250e+06        1.9250e+06        1.9250e+06

2016-11-08 B

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1112.1        1.0416e+06        1.0354e+06        1.0479e+06
2224.6        1.0526e+06        1.0498e+06        1.0555e+06
2506.2        6.2467e+06        6.2222e+06        6.2715e+06
2511.0        9.1074e+05        8.9608e+05        9.2589e+05
2544.9        9.2936e+05        9.2745e+05        9.3127e+05
2579.0        9.3199e+05        9.2088e+05        9.4336e+05
2583.3        9.1765e+05        9.1228e+05        9.2308e+05
2778.1        2.6436e+06        2.6213e+06        2.6664e+06
3657.0        9.4905e+05        9.4892e+05        9.4918e+05
4323.0        2.7441e+06        2.6975e+06        2.7924e+06
4361.4        2.9870e+06        2.9852e+06        2.9887e+06
5618.3        9.7528e+05        9.7519e+05        9.7536e+05
6653.7        2.9851e+06        2.9799e+06        2.9903e+06
6670.0        1.0065e+07        1.0049e+07        1.0081e+07
6691.7        1.4940e+06        1.4774e+06        1.5110e+06
6723.0        9.4356e+04        9.4349e+04        9.4363e+04
6730.5        1.5010e+06        1.5000e+06        1.5021e+06
6737.7        9.3824e+04        9.3817e+04        9.3831e+04
6769.0        1.4817e+06        1.4683e+06        1.4954e+06
6797.8        3.4621e+05        3.4618e+05        3.4623e+05
7842.6        1.3638e+06        1.3637e+06        1.3639e+06
9372.2        2.1002e+06        2.0979e+06        2.1025e+06
10055.0        1.6575e+06        1.6417e+06        1.6735e+06
10210.0        2.7696e+05        2.7694e+05        2.7697e+05
12507.3        1.5841e+06        1.5824e+06        1.5858e+06
13961.5        6.9382e+06        6.8656e+06        7.0122e+06
15837.2        1.9985e+06        1.9964e+06        2.0006e+06
15850.6        5.9234e+06        5.9232e+06        5.9236e+06
16064.0        1.7705e+06        1.7704e+06        1.7705e+06
18361.4        2.5816e+06        2.5815e+06        2.5817e+06
19983.2        1.3972e+06        1.3907e+06        1.4038e+06
21043.9        9.7066e+06        8.8724e+06        1.0714e+07
22640.9        2.8173e+06        2.8173e+06        2.8174e+06
23218.7        4.2100e+06        4.2099e+06        4.2101e+06
24331.1        1.2336e+06        1.2336e+06        1.2336e+06
28436.4        2.7860e+06        2.7860e+06        2.7861e+06
28635.6        2.7569e+06        2.7568e+06        2.7569e+06

 

  167   Tue Nov 8 11:39:20 2016 GabrieleGeneralMeasurementsS1600459

2016-11-08

  • 11:23, in chamber, balanced
  • 11:25 roughing pump on
  • 11:38 turbo pump on
  • 1:38pm excitation (3kV, ~20s). Quiet time before: 1162677138, quiet time after 1162677462
  • 3:27pm excitation. (3kV, 30s). Quiet time after 1162682879
  • 4:37pm, pumps stopped

Results

2016-11-08 A

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1108.3        1.5638e+07        1.5570e+07        1.5708e+07
2503.6        7.2192e+06        6.8796e+06        7.5940e+06
2542.2        7.3800e+06        7.3760e+06        7.3839e+06
4389.0        5.3514e+06        5.3121e+06        5.3913e+06
4427.6        5.3885e+06        5.3869e+06        5.3901e+06
4466.2        5.4399e+06        5.4000e+06        5.4803e+06
4495.0        2.1932e+05        2.1899e+05        2.1966e+05
6754.2        3.8355e+06        3.8326e+06        3.8383e+06
6767.2        1.3227e+07        1.3213e+07        1.3240e+07
6793.5        2.1749e+06        2.1747e+06        2.1751e+06
6832.1        2.1373e+06        2.1366e+06        2.1380e+06
6870.6        2.2276e+06        2.2274e+06        2.2278e+06
9512.8        2.9775e+06        2.9723e+06        2.9828e+06
10200.3        2.5862e+06        2.5812e+06        2.5913e+06
10357.0        1.7162e+06        1.7161e+06        1.7163e+06
12694.6        5.9843e+05        5.9841e+05        5.9845e+05
14162.4        4.9621e+06        4.9386e+06        4.9860e+06
16069.7        1.1980e+06        1.1979e+06        1.1980e+06
16080.1        2.6316e+06        2.6237e+06        2.6395e+06
16301.9        1.4163e+06        1.4162e+06        1.4163e+06
18623.9        3.6294e+06        3.6258e+06        3.6330e+06
20280.4        8.2385e+05        8.2383e+05        8.2387e+05
23548.3        4.6763e+06        4.6762e+06        4.6764e+06
24690.0        1.1723e+06        1.1723e+06        1.1724e+06
25694.0        5.4900e+05        5.4899e+05        5.4901e+05
27116.0        2.5536e+06        2.5536e+06        2.5537e+06
28845.1        1.6430e+06        1.6430e+06        1.6430e+06
29041.5        2.5349e+06        2.5348e+06        2.5349e+06
29519.0        2.5811e+06        2.5811e+06        2.5812e+06
30419.5        1.8440e+06        1.8439e+06        1.8440e+06
31263.4        1.5940e+06        1.5940e+06        1.5941e+06
32136.9        4.5330e+06        4.5330e+06        4.5331e+06

2016-11-08 B

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1108.4        1.3404e+07        1.3360e+07        1.3447e+07
2542.2        6.9483e+06        6.9392e+06        6.9574e+06
4389.0        4.5933e+06        4.5528e+06        4.6345e+06
4427.6        5.0578e+06        5.0565e+06        5.0591e+06
4466.1        4.7063e+06        4.6660e+06        4.7473e+06
4495.1        2.2376e+05        2.2324e+05        2.2427e+05
6754.3        3.5768e+06        3.5759e+06        3.5777e+06
6767.1        1.2441e+07        1.2411e+07        1.2470e+07
6793.7        1.9583e+06        1.9581e+06        1.9584e+06
6832.2        2.0323e+06        2.0318e+06        2.0329e+06
6870.7        2.0027e+06        2.0026e+06        2.0029e+06
9512.8        2.7522e+06        2.7497e+06        2.7546e+06
10200.4        2.4866e+06        2.4793e+06        2.4938e+06
10357.0        1.6884e+06        1.6837e+06        1.6931e+06
12694.7        6.2234e+05        6.2231e+05        6.2236e+05
14162.3        5.4381e+06        5.4299e+06        5.4463e+06
16069.8        1.1596e+06        1.1595e+06        1.1596e+06
16080.2        2.5075e+06        2.5002e+06        2.5148e+06
16302.0        1.3303e+06        1.3302e+06        1.3303e+06
18624.0        3.6265e+06        3.6207e+06        3.6322e+06
20280.6        7.8640e+05        7.8638e+05        7.8642e+05
21342.5        6.1946e+06        6.1945e+06        6.1948e+06
23548.5        3.9191e+06        3.9190e+06        3.9191e+06
24690.1        1.0713e+06        1.0713e+06        1.0713e+06
28845.3        1.6909e+06        1.6909e+06        1.6910e+06
29041.7        2.6668e+06        2.6668e+06        2.6669e+06
29518.6        2.4022e+06        2.4022e+06        2.4022e+06
30419.3        1.5929e+06        1.5929e+06        1.5930e+06
31263.0        1.4750e+06        1.4750e+06        1.4751e+06
32136.8        4.1712e+06        4.1711e+06        4.1713e+06

 

  166   Mon Nov 7 16:59:10 2016 GabrieleGeneralMeasurementsS1600458

2016-11-07

  • 4:46pm installed and balanced
  • 4:47pm, roughing pump started
  • 4:59pm turbo pump started
  • 8:23pm: excitation, quiet time before 1162613072, excitation 1 kV, quiet time after 1162614126
  • Three more excitations (1.5 kV, 20 seconds) planned for the night
    • Quiet time before excitation: 1162624994
      Excitation at 1162625037 (20 s)
      Quiet time after excitation: 1162625057

    • Quiet time before excitation: 1162635887
      Excitation at 1162635930 (20 s)
      Quiet time after excitation: 1162635950

    • Quiet time before excitation: 1162646780
      Excitation at 1162646823 (20 s)
      Quiet time after excitation: 1162646843

  • Not clear why, but the overnight excitation didn't go through.
    Trying again amplitude 3kV, quiet time before 1162657046, quiet time after 1162657246

2016-11-08

  • pumps stopped at 10:15am

Results

2016-11-07

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
2551.8        3.7876e+06        3.7330e+06        3.8438e+06
4443.7        3.5381e+06        3.5361e+06        3.5400e+06
4511.3        2.3349e+05        2.3326e+05        2.3373e+05
6778.3        2.7169e+06        2.7161e+06        2.7178e+06
6790.6        8.5771e+06        8.4590e+06        8.6985e+06
6856.4        1.5505e+06        1.5497e+06        1.5513e+06
6918.0        5.2488e+04        5.2484e+04        5.2492e+04
9546.1        2.5680e+06        2.5632e+06        2.5729e+06
10236.2        1.5916e+06        1.5915e+06        1.5917e+06
10392.6        1.9989e+06        1.9988e+06        1.9990e+06
11331.0        1.2034e+06        1.2033e+06        1.2035e+06
12738.7        1.3389e+06        1.3365e+06        1.3414e+06
12865.9        5.5771e+05        5.5768e+05        5.5773e+05
14212.1        4.5965e+06        4.5963e+06        4.5966e+06
16123.7        2.8340e+06        2.8253e+06        2.8427e+06
16136.4        8.1131e+06        8.0328e+06        8.1950e+06
16357.3        2.3864e+06        2.3820e+06        2.3908e+06
18688.6        3.6459e+06        3.6459e+06        3.6460e+06
18865.2        2.2149e+06        2.2149e+06        2.2150e+06
20348.7        1.5629e+06        1.5628e+06        1.5629e+06
21415.2        1.7095e+06        1.7095e+06        1.7095e+06
21904.5        3.6954e+06        3.6953e+06        3.6955e+06
23630.5        1.3725e+06        1.3724e+06        1.3725e+06
23787.0        3.3216e+05        3.3215e+05        3.3216e+05
24771.6        1.1522e+06        1.1522e+06        1.1523e+06
25236.5        1.9997e+06        1.9996e+06        1.9997e+06
25543.0        5.9194e+05        5.9193e+05        5.9195e+05
25562.4        8.3780e+05        8.3778e+05        8.3782e+05
27208.6        2.2973e+06        2.2972e+06        2.2973e+06
28226.8        6.0508e+06        6.0507e+06        6.0509e+06
28228.5        5.1058e+06        5.1057e+06        5.1058e+06
28233.5        2.8462e+06        2.8461e+06        2.8462e+06
28946.1        3.0162e+06        3.0161e+06        3.0162e+06
29045.1        1.5018e+06        1.5018e+06        1.5018e+06
29139.3        4.5280e+06        4.5280e+06        4.5281e+06
29398.6        6.9469e+06        6.9468e+06        6.9470e+06
29622.5        1.2690e+06        1.2690e+06        1.2690e+06
30303.0        1.8432e+06        1.8431e+06        1.8432e+06
31149.4        1.0890e+06        1.0890e+06        1.0891e+06
32024.0        2.0661e+06        2.0660e+06        2.0661e+06

2016-11-08

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1112.6        6.0778e+06        6.0522e+06        6.1037e+06
2551.8        4.2832e+06        4.2750e+06        4.2915e+06
4405.0        3.7124e+06        3.6470e+06        3.7801e+06
4443.7        3.4543e+06        3.4532e+06        3.4554e+06
4511.3        2.3471e+05        2.3442e+05        2.3500e+05
6778.3        2.7676e+06        2.7667e+06        2.7685e+06
6790.5        9.3077e+06        9.2532e+06        9.3628e+06
6818.0        1.5965e+06        1.5964e+06        1.5966e+06
6856.4        1.5612e+06        1.5607e+06        1.5617e+06
6895.0        1.5618e+06        1.5617e+06        1.5619e+06
6918.3        5.5271e+04        5.5267e+04        5.5275e+04
9546.1        2.4813e+06        2.4792e+06        2.4834e+06
10236.1        1.4156e+06        1.4156e+06        1.4157e+06
10392.6        1.9300e+06        1.9232e+06        1.9369e+06
11331.6        1.4138e+06        1.4137e+06        1.4138e+06
12738.7        1.5267e+06        1.5254e+06        1.5281e+06
12865.8        6.3722e+05        6.3719e+05        6.3724e+05
14211.9        4.4968e+06        4.4967e+06        4.4970e+06
16123.6        2.6170e+06        2.6169e+06        2.6171e+06
16136.4        7.7399e+06        7.6976e+06        7.7827e+06
16357.2        1.9119e+06        1.9077e+06        1.9161e+06
18688.5        3.1745e+06        3.1745e+06        3.1746e+06
18865.0        2.0300e+06        2.0299e+06        2.0300e+06
20348.7        1.4390e+06        1.4390e+06        1.4391e+06
21415.1        1.6406e+06        1.6405e+06        1.6406e+06
23630.5        1.5226e+06        1.5225e+06        1.5226e+06
25237.0        2.5215e+06        2.5214e+06        2.5215e+06
25543.0        8.4456e+05        8.4455e+05        8.4458e+05
27208.5        2.8485e+06        2.8484e+06        2.8485e+06
28946.0        2.7426e+06        2.7426e+06        2.7427e+06
29622.3        1.2209e+06        1.2209e+06        1.2209e+06

 

 

  165   Mon Nov 7 11:27:16 2016 GabrieleGeneralVacuumTurbo pump excites some resonance at 58 Hz

I looked into a couple of turbo pump switch on periods, and in both cases when the pump speed hits 58 Hz, a resonance is excited. I'm not sure what's resonating.

Today I let the roughing pump reduce the pressure to a level lower than usual, and this seems to mitigate the effect. The disk wasn't shaking as much as it did in previous pump-downs.

  164   Mon Nov 7 10:39:08 2016 GabrieleGeneralMeasurementsS1600457

2016-11-07

  • 10:30am, re-aligned optical system to horizontal reference
  • 10:37am, in chamber balanced
  • 10:38am, started roughing pump
  • 10:52am, started turbo pump, pressure was <2 Torr
    • disk got briefly excited when the pump was at ~60 Hz, and again at ~200 Hz,
    • centered QPD with picomotors at 10:54am,49
    • pump at 500 Hz at 10:55am, no more disk excitations.
    • IGM on at 10:55am, disk moved briefly afterwards, not sure if correlated since the IGM controlled is still showing "STARTING".
    • Disk definitely moved at 10:57:40, when the IGM controller started showing pressure.
      IGM switched off at 10:58:45am, disk is not going back!
    • QPD recentered using picomotors.
    • IGM on again at 11:00am, no disk displacement this time.
  • 12:20pm:
    • quiet time before excitation 1162585209
    • excitation
    • quiet time after excitation 1162585348
  • 1:49pm: excitation again, 2kV, quiet time after 1162585348
  • In both the previous excitations the QPD got misaligned at the beginning, resulting in not very good ring-downs
  • Another trial at 1162597014, amplitud 1.5kV. Somebody switched on the light in the lab...
  • pumps stopped at 4:09pm

Results

2016-11-07 A

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1109.0        6.0358e+06        6.0221e+06        6.0496e+06
2543.3        2.8271e+06        2.8234e+06        2.8309e+06
2581.0        9.1904e+05        9.1711e+05        9.2097e+05
2619.5        7.6167e+05        7.4294e+05        7.8136e+05
3413.6        1.1513e+06        1.1511e+06        1.1514e+06
4390.0        2.5891e+06        2.5308e+06        2.6501e+06
4428.7        2.4948e+06        2.4938e+06        2.4958e+06
4467.4        2.6014e+06        2.5551e+06        2.6494e+06
6754.1        1.9049e+06        1.8972e+06        1.9126e+06
6770.9        6.5053e+06        6.4828e+06        6.5279e+06
6825.1        9.5015e+05        9.4829e+05        9.5201e+05
10206.7        7.1637e+06        7.1482e+06        7.1792e+06
12689.2        1.3788e+06        1.3788e+06        1.3789e+06
14169.7        5.2321e+06        5.1965e+06        5.2682e+06
16078.8        1.3844e+06        1.3844e+06        1.3844e+06
16089.5        7.6177e+06        7.5997e+06        7.6358e+06
16289.4        1.1658e+06        1.1658e+06        1.1658e+06
18631.4        2.4582e+06        2.4581e+06        2.4582e+06
20268.5        9.5666e+05        9.5663e+05        9.5668e+05
21348.3        1.2590e+07        1.2590e+07        1.2590e+07
23561.2        2.9089e+06        2.9088e+06        2.9090e+06
27121.0        5.1018e+06        5.1017e+06        5.1019e+06

2016-11-07 B

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1109.0        6.0358e+06        6.0221e+06        6.0496e+06
2543.3        2.8271e+06        2.8234e+06        2.8309e+06
2581.0        9.1904e+05        9.1711e+05        9.2097e+05
2619.5        7.6167e+05        7.4294e+05        7.8136e+05
3413.6        1.1513e+06        1.1511e+06        1.1514e+06
4390.0        2.5891e+06        2.5308e+06        2.6501e+06
4428.7        2.4948e+06        2.4938e+06        2.4958e+06
4467.4        2.6014e+06        2.5551e+06        2.6494e+06
6754.1        1.9049e+06        1.8972e+06        1.9126e+06
6770.9        6.5053e+06        6.4828e+06        6.5279e+06
6825.1        9.5015e+05        9.4829e+05        9.5201e+05
10206.7        7.1637e+06        7.1482e+06        7.1792e+06
12689.2        1.3788e+06        1.3788e+06        1.3789e+06
14169.7        5.2321e+06        5.1965e+06        5.2682e+06
16078.8        1.3844e+06        1.3844e+06        1.3844e+06
16089.5        7.6177e+06        7.5997e+06        7.6358e+06
16289.4        1.1658e+06        1.1658e+06        1.1658e+06
18631.4        2.4582e+06        2.4581e+06        2.4582e+06
20268.5        9.5666e+05        9.5663e+05        9.5668e+05
21348.3        1.2590e+07        1.2590e+07        1.2590e+07
23561.2        2.9089e+06        2.9088e+06        2.9090e+06
27121.0        5.1018e+06        5.1017e+06        5.1019e+06
  163   Sun Nov 6 10:14:51 2016 GabrieleGeneralMeasurementsS1600456

2016-11-06

  • 10:12am: installed in chamber, balanced
  • 10:14am: roughing pump on
  • 10:22am: turbo pump on
  • 12:40pm: excitation:
    • quiet before excitation 1162501864+30
    • quiet after excitation 1162501946+30
  • 4pm excitation
    • Quiet time before excitation: 1162512830
      Excitation at 1162512873 (20 s)
      Excitation finished
      Quiet time after excitation: 1162512893

  • 6:05pm: In both ringdowns the first mode at 1 kHz wasn't properly excited. I moved the laser beam on a different spot. Using brodband noise I still couldn't get it to ring up. So I injected bandlimited noise 1000-1200 Hz with amplitude of 10000. Mode are up.
    Quiet time after injection from 1162519598

  • 8:07pm, again band-limited excitation, quiet time after 1162526818

2016-11-07

  • 8:39am: pumps off

Results

2016-11-05 A

 

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
2509.1        4.0579e+06        4.0553e+06        4.0606e+06
2549.8        8.5490e+05        8.4709e+05        8.6286e+05
4370.0        1.6497e+06        1.6492e+06        1.6501e+06
4437.0        2.2329e+05        2.2310e+05        2.2347e+05
6666.4        2.6788e+06        2.6756e+06        2.6819e+06
6680.0        7.6174e+06        7.6026e+06        7.6322e+06
6743.0        1.8669e+06        1.8664e+06        1.8673e+06
6807.3        2.9358e+05        2.9335e+05        2.9382e+05
9389.2        2.3737e+06        2.3726e+06        2.3748e+06
10070.3        8.5206e+05        8.5202e+05        8.5211e+05
10225.0        6.2779e+05        6.2776e+05        6.2782e+05
12529.9        1.3218e+06        1.3217e+06        1.3218e+06
13983.0        1.5269e+06        1.5269e+06        1.5270e+06
15863.5        1.8321e+06        1.8320e+06        1.8321e+06
15875.4        5.0350e+06        5.0348e+06        5.0351e+06
16091.5        1.0913e+06        1.0912e+06        1.0913e+06
18389.0        5.3468e+06        5.3357e+06        5.3580e+06
21074.0        3.7649e+06        3.7648e+06        3.7650e+06
23252.3        3.0067e+06        2.9999e+06        3.0135e+06
24371.4        1.2491e+06        1.2490e+06        1.2491e+06
26778.6        2.5593e+06        2.5592e+06        2.5593e+06
28482.4        2.6427e+06        2.6426e+06        2.6427e+06
28579.0        1.8244e+06        1.8244e+06        1.8245e+06
28678.4        6.4318e+06        6.4317e+06        6.4319e+06
31701.4        1.3385e+06        1.3384e+06        1.3385e+06

2019-11-06 B

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
2509.0        4.3643e+06        4.3445e+06        4.3843e+06
4370.1        2.0745e+06        2.0560e+06        2.0935e+06
4437.0        3.5763e+05        3.4927e+05        3.6641e+05
6666.5        2.8583e+06        2.8327e+06        2.8845e+06
6680.0        9.7911e+06        9.7594e+06        9.8230e+06
6743.0        1.9479e+06        1.9265e+06        1.9698e+06
6807.3        5.0716e+05        4.9331e+05        5.2179e+05
9389.2        2.6386e+06        2.6104e+06        2.6675e+06
10070.3        1.0634e+06        1.0633e+06        1.0634e+06
10225.1        1.0434e+06        1.0433e+06        1.0434e+06
12529.9        1.6029e+06        1.5749e+06        1.6318e+06
13983.3        2.7379e+06        2.7016e+06        2.7751e+06
15863.7        2.2082e+06        2.2082e+06        2.2083e+06
15875.4        3.2435e+06        3.2434e+06        3.2436e+06
23252.2        3.6506e+06        3.6505e+06        3.6507e+06
24371.5        2.0111e+06        2.0110e+06        2.0111e+06
26779.0        2.1974e+05        2.1973e+05        2.1974e+05
28579.1        2.7341e+06        2.7341e+06        2.7342e+06
28679.0        6.2394e+06        6.2393e+06        6.2395e+06
31701.0        2.2893e+06        2.2893e+06        2.2893e+06

2016-11-06 First mode

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1094.0        1.0221e+07        1.0194e+07        1.0249e+07
1115.0        1.5958e+06        1.5885e+06        1.6031e+06

 

Attachment 9: ringdowns_1st.png
ringdowns_1st.png
Attachment 10: Qs_errorbars_1st.png
Qs_errorbars_1st.png
  162   Sat Nov 5 17:40:35 2016 GabrieleGeneralMeasurementsS1600453

2015-11-05

  • 5:39pm in chamber, balanced
  • 5:40pm roughing pump on
  • 5:50pm turbo on
  • 7:55pm: excitation. Quiet before 1162436202, excitation ampl. 2kV, quiet after 1162436358
  • Three more excitation set up (2kV, 20s) at 11pm, 2am and 6am
    • Quiet time before excitation: 1162447332
      Excitation at 1162447375 (20 s)
      Excitation finished
      Quiet time after excitation: 1162447395

    • Quiet time before excitation: 1162461825
      Excitation at 1162461868 (20 s)
      Excitation finished
      Quiet time after excitation: 1162461888

    • Quiet time before excitation: 1162476319
      Excitation at 1162476362 (20 s)
      Excitation finished
      Quiet time after excitation: 1162476382

  • Those didn't work because I forgot to set the ESD gain to 1!!!!

2015-11-06

  • 9:34am: pumps off
  • 10:08 removed from chamber

Results

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1098.1        1.5137e+07        1.5118e+07        1.5156e+07
2481.0        8.4768e+06        8.3498e+06        8.6077e+06
2519.4        7.9043e+06        7.9003e+06        7.9082e+06
2559.9        1.8115e+06        1.8024e+06        1.8206e+06
4388.9        4.7996e+06        4.7985e+06        4.8006e+06
4455.9        2.1908e+05        2.1905e+05        2.1910e+05
6696.4        4.0144e+06        4.0126e+06        4.0163e+06
6710.7        1.5767e+07        1.5747e+07        1.5787e+07
6772.8        2.6200e+06        2.6164e+06        2.6237e+06
9432.4        3.1762e+06        3.1742e+06        3.1782e+06
10116.4        4.2917e+06        4.2915e+06        4.2920e+06
10271.0        2.6169e+05        2.6168e+05        2.6170e+05
12587.8        2.4988e+06        2.4972e+06        2.5005e+06
14047.1        3.0949e+06        3.0846e+06        3.1052e+06
15936.5        3.3676e+06        3.3470e+06        3.3884e+06
15946.1        1.0214e+07        1.0164e+07        1.0264e+07
16166.6        2.3195e+06        2.3112e+06        2.3279e+06
18475.0        3.6992e+06        3.6991e+06        3.6993e+06
18525.5        2.4106e+06        2.4106e+06        2.4107e+06
20112.0        1.0591e+06        1.0591e+06        1.0591e+06
23361.8        6.6258e+06        6.6139e+06        6.6378e+06
24486.5        1.9252e+06        1.9252e+06        1.9253e+06
26010.0        1.0992e+06        1.0991e+06        1.0992e+06
26897.0        9.2142e+06        9.1310e+06        9.2990e+06
28618.0        3.6201e+06        3.6200e+06        3.6201e+06
28714.7        3.0597e+06        3.0597e+06        3.0598e+06
28804.0        1.2547e+07        1.2485e+07        1.2610e+07
29322.4        1.7786e+06        1.7786e+06        1.7786e+06
31536.4        1.9114e+06        1.9113e+06        1.9114e+06
  161   Sat Nov 5 10:49:17 2016 GabrieleGeneralMeasurementsS1600452

2015-11-05

  • 10:45am in chamber and balanced
  • 10:48am roughing pump on
  • 10:56am turbo pump on
  • 1:00pm: excitation. Quiet before 1162411289, excite (2 kV, 10s), quiet after 1162411438
  • 4:07pm: excitation. Quiet before 1162422382, excite (2kV, 20s), quiet after 1162422445
  • 5:08pm: pumps off

Results

The first mode at 1 kHz couldn't be measured. Not clear why.

2016-11-05 A
 

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
2488.7        6.2525e+06        6.2046e+06        6.3012e+06
2527.3        7.2443e+06        7.2391e+06        7.2496e+06
2567.0        9.8492e+04        9.8472e+04        9.8511e+04
4363.0        3.4808e+06        3.4060e+06        3.5590e+06
4401.4        5.8009e+06        5.7966e+06        5.8052e+06
4427.7        1.6106e+05        1.6104e+05        1.6108e+05
4466.5        1.7637e+05        1.7623e+05        1.7651e+05
4505.0        1.6860e+05        1.6858e+05        1.6862e+05
6713.4        4.4123e+06        4.4106e+06        4.4139e+06
6725.3        1.7867e+07        1.7854e+07        1.7880e+07
6750.5        1.9213e+06        1.9079e+06        1.9348e+06
6789.1        2.3629e+06        2.3617e+06        2.3642e+06
6827.7        1.9619e+06        1.9487e+06        1.9754e+06
9454.4        3.0169e+06        3.0136e+06        3.0203e+06
10138.7        8.3140e+06        8.3026e+06        8.3255e+06
10290.4        8.9211e+05        8.9206e+05        8.9215e+05
12615.5        6.3311e+05        6.3308e+05        6.3313e+05
12738.9        2.4194e+05        2.4193e+05        2.4195e+05
14078.0        8.8470e+06        8.8231e+06        8.8710e+06
15974.6        1.5678e+06        1.5649e+06        1.5707e+06
16198.2        6.8727e+05        6.8725e+05        6.8729e+05
18512.9        4.6128e+06        4.5972e+06        4.6286e+06
20103.2        5.6830e+05        5.6829e+05        5.6831e+05
20153.5        1.0308e+06        1.0308e+06        1.0309e+06
21211.0        2.7134e+06        2.7133e+06        2.7135e+06
23409.3        7.0470e+06        7.0469e+06        7.0472e+06
24533.4        1.5102e+06        1.5101e+06        1.5102e+06
25926.0        9.7012e+05        9.7010e+05        9.7014e+05
26951.6        9.2671e+06        9.2669e+06        9.2673e+06
28680.1        5.3425e+06        5.3424e+06        5.3426e+06
28777.7        3.7576e+06        3.7575e+06        3.7576e+06
29370.5        6.4020e+05        6.4019e+05        6.4021e+05
31459.5        1.3127e+06        1.3127e+06        1.3128e+06

2016-11-05 B

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
2525.0        7.0757e+06        7.0674e+06        7.0841e+06
2526.3        7.0794e+06        7.0710e+06        7.0879e+06
4401.5        5.5472e+06        5.4910e+06        5.6046e+06
4465.8        1.9017e+05        1.9015e+05        1.9019e+05
6713.5        4.1401e+06        4.1258e+06        4.1545e+06
6789.1        2.3060e+06        2.3003e+06        2.3117e+06
9454.4        3.1170e+06        3.0629e+06        3.1730e+06
10290.5        9.9500e+05        9.9495e+05        9.9505e+05
14077.6        8.3035e+06        8.2846e+06        8.3225e+06
15975.0        1.7004e+06        1.7004e+06        1.7005e+06
16198.4        9.3526e+05        9.3523e+05        9.3529e+05
23409.0        6.9232e+06        6.8897e+06        6.9570e+06
26951.5        8.9906e+06        8.9904e+06        8.9907e+06
28680.0        5.1012e+06        5.1011e+06        5.1012e+06
Attachment 3: ringdowns.png
ringdowns.png
Attachment 4: Qs_errorbars.png
Qs_errorbars.png
  160   Fri Nov 4 16:16:23 2016 AlenaGeneralGeneralAnnealing run

Annealing run (454-459) on 3" wafers - Crime 11/02/2016 https://dcc.ligo.org/LIGO-T1600510

Annealing run (460-465) on 3" wafers - Crime 11/04/2016 https://dcc.ligo.org/T1600513-x0

  159   Fri Nov 4 14:56:35 2016 GabrieleGeneralMeasurementsS1600451

2016-11-04

  • 2:45pm: re-aligned optical setup to horizontal reference
  • 2:55pm: installed in chamber, balanced
  • 2:56pm, starting roughing pump
  • 3:06pm, starting turbo pump
  • 4:37pm, excitation at GPS 1162337817: apparently I excited too much and the QPD signals are saturating!

  • 7:58pm: new excitation, amplitude 1kV, duration ~20s. Stopped at ~1162349974. This excitation looks good
  • 9:07pm:Started auto_excite.py script. It will wait 5 hours, then perfom two excitation with above parameters, separated by 3 hours
    • excitations at 1162372099 and 1162382978

2016-11-05

  • pumps stopped at 10:00am

Results

2016-11-04

 

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1097.0        1.1219e+07        1.1201e+07        1.1236e+07
2515.7        6.3988e+06        6.2433e+06        6.5622e+06
4379.6        9.6150e+06        9.6117e+06        9.6182e+06
4440.9        3.8684e+06        3.8668e+06        3.8701e+06
6678.8        2.7195e+05        2.7170e+05        2.7220e+05
6696.5        2.9698e+06        2.9684e+06        2.9712e+06
6750.6        1.3442e+07        1.3387e+07        1.3497e+07
6811.9        1.9344e+06        1.9288e+06        1.9402e+06
9403.6        1.4946e+05        1.4945e+05        1.4946e+05
10095.6        2.4035e+06        2.4001e+06        2.4069e+06
10237.1        6.5129e+05        6.4697e+05        6.5567e+05
12545.2        1.1434e+06        1.1392e+06        1.1476e+06
12662.5        1.7179e+06        1.7114e+06        1.7245e+06
15901.4        1.5770e+05        1.5769e+05        1.5770e+05
15914.3        2.6775e+06        2.6703e+06        2.6846e+06
16104.5        1.1722e+07        1.1685e+07        1.1760e+07
18110.0        2.1021e+06        2.0988e+06        2.1054e+06
18430.2        9.4278e+05        9.4276e+05        9.4281e+05
18594.0        4.3087e+06        4.3033e+06        4.3142e+06
21119.0        2.6590e+05        2.6589e+05        2.6590e+05
23305.8        2.9146e+06        2.9069e+06        2.9224e+06
24386.0        5.3982e+06        5.3779e+06        5.4187e+06
24654.5        1.2901e+06        1.2900e+06        1.2901e+06
24705.0        1.0320e+06        1.0319e+06        1.0320e+06
25798.0        2.0084e+06        2.0083e+06        2.0084e+06
26123.0        4.1997e+06        4.1996e+06        4.1998e+06
26831.0        5.9972e+05        5.9971e+05        5.9973e+05
28145.0        6.7827e+06        6.7546e+06        6.8110e+06
28555.7        3.7397e+06        3.7397e+06        3.7398e+06
28642.1        3.2190e+06        3.2189e+06        3.2190e+06
29175.0        2.3940e+06        2.3939e+06        2.3940e+06
29190.7        9.6877e+05        9.6876e+05        9.6879e+05
29885.0        1.1788e+06        1.1788e+06        1.1788e+06
30847.0        9.0157e+06        9.0155e+06        9.0158e+06
32238.4        2.3676e+06        2.3676e+06        2.3677e+06
32489.6        1.8718e+06        1.8718e+06        1.8719e+06

2016-11-05 A

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1097.5        1.0150e+07        1.0127e+07        1.0174e+07
2515.7        5.5427e+06        5.5405e+06        5.5448e+06
4341.0        3.9407e+06        3.9204e+06        3.9613e+06
4379.5        3.7580e+06        3.7570e+06        3.7589e+06
4418.3        4.0055e+06        3.9839e+06        4.0272e+06
4479.5        1.8248e+05        1.8246e+05        1.8250e+05
6640.4        3.1482e+06        3.1137e+06        3.1834e+06
6678.8        2.9326e+06        2.9319e+06        2.9334e+06
6696.5        1.2999e+07        1.2995e+07        1.3004e+07
6712.1        1.8502e+06        1.8416e+06        1.8589e+06
6750.6        1.8423e+06        1.8418e+06        1.8428e+06
6789.1        1.8641e+06        1.8557e+06        1.8726e+06
6812.0        1.2882e+05        1.2875e+05        1.2888e+05
9403.7        2.2149e+06        2.2119e+06        2.2178e+06
10095.7        6.7624e+05        6.7532e+05        6.7716e+05
10237.1        8.8267e+05        8.8113e+05        8.8423e+05
12545.3        1.7193e+06        1.7154e+06        1.7231e+06
12662.9        1.3162e+05        1.3162e+05        1.3163e+05
14015.5        7.8470e+06        7.6850e+06        8.0159e+06
14749.0        8.7237e+05        8.7234e+05        8.7240e+05
15901.5        2.6799e+06        2.6757e+06        2.6840e+06
16104.6        1.8324e+06        1.8309e+06        1.8340e+06
18109.3        9.6584e+05        9.6582e+05        9.6587e+05
18430.3        4.5212e+06        4.5195e+06        4.5229e+06
18659.2        2.5315e+06        2.5315e+06        2.5316e+06
19997.4        6.2817e+05        6.2816e+05        6.2819e+05
20036.5        1.3129e+06        1.3129e+06        1.3130e+06
20278.0        6.2428e+05        6.2426e+05        6.2429e+05
21119.1        3.4785e+06        3.4784e+06        3.4786e+06
22490.4        4.4881e+06        4.4880e+06        4.4882e+06
23305.9        5.3494e+06        5.3429e+06        5.3559e+06
24386.2        1.3629e+06        1.3628e+06        1.3629e+06
24654.4        9.2395e+05        9.2393e+05        9.2397e+05
24704.5        1.9166e+06        1.9132e+06        1.9201e+06
26123.2        6.4702e+05        6.4700e+05        6.4703e+05
26831.0        5.9846e+06        5.9684e+06        6.0009e+06
28555.8        2.9833e+06        2.9832e+06        2.9833e+06
28642.1        2.1156e+06        2.1156e+06        2.1157e+06
28742.9        1.0233e+07        1.0233e+07        1.0233e+07
29175.0        9.1788e+05        9.1786e+05        9.1789e+05
29191.0        1.1637e+06        1.1637e+06        1.1637e+06
29885.1        8.3480e+06        8.3478e+06        8.3481e+06
30846.5        2.2345e+06        2.2345e+06        2.2345e+06
31607.5        3.6183e+05        3.6183e+05        3.6184e+05
32489.4        5.7409e+06        5.7408e+06        5.7410e+06

2016-11-05 B

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1098.0        8.1698e+06        8.1032e+06        8.2374e+06
2477.0        5.0803e+06        4.9987e+06        5.1646e+06
2515.6        5.5435e+06        5.5413e+06        5.5458e+06
4341.1        3.6399e+06        3.6069e+06        3.6736e+06
4379.6        3.7430e+06        3.7422e+06        3.7439e+06
4418.0        3.6883e+06        3.6647e+06        3.7122e+06
4440.9        1.8011e+05        1.8009e+05        1.8013e+05
6678.7        2.9283e+06        2.9246e+06        2.9320e+06
6696.5        1.2927e+07        1.2908e+07        1.2946e+07
6750.6        1.8937e+06        1.8911e+06        1.8963e+06
6812.1        1.3790e+05        1.3789e+05        1.3791e+05
9365.0        2.2626e+06        2.2625e+06        2.2627e+06
9403.7        2.2105e+06        2.2094e+06        2.2117e+06
10095.5        6.4293e+05        6.4290e+05        6.4296e+05
10237.2        9.2890e+05        9.2885e+05        9.2894e+05
12545.3        1.7237e+06        1.7080e+06        1.7398e+06
15901.4        2.6697e+06        2.6697e+06        2.6698e+06
15914.5        1.1338e+07        1.1245e+07        1.1432e+07
16104.5        1.7841e+06        1.7840e+06        1.7841e+06
18109.5        9.4816e+05        9.4814e+05        9.4819e+05
18430.3        4.6575e+06        4.6555e+06        4.6594e+06
21119.1        3.7468e+06        3.7338e+06        3.7599e+06
23305.9        5.3687e+06        5.3582e+06        5.3792e+06
24386.1        1.3616e+06        1.3616e+06        1.3616e+06
24654.5        9.7495e+05        9.7493e+05        9.7497e+05
24704.4        1.9229e+06        1.9229e+06        1.9230e+06
26831.1        5.8344e+06        5.8342e+06        5.8345e+06
28556.0        3.0677e+06        3.0676e+06        3.0677e+06
29175.2        8.7856e+05        8.7855e+05        8.7858e+05
29190.8        1.1455e+06        1.1454e+06        1.1455e+06
29885.1        8.9158e+06        8.9157e+06        8.9160e+06
30846.6        2.1943e+06        2.1943e+06        2.1944e+06
32489.5        5.2642e+06        5.2641e+06        5.2642e+06

 

  158   Fri Nov 4 11:31:11 2016 GabrieleElectronicsConfigurationAutocenter control and model modifications

Removed the peak meter lock from the model, since it's not used

Added and EPICS binary bit to control the autocenter, added corresponding buttons to the MEDM screen.

Now the GUI stops the autocentering when acquiring the reference spectrum.

The auto_excite.py also stops the autocentering 35 seconds before the excitation and until 35 second after the excitation, to provide for two reference quiet periods.

  157   Fri Nov 4 08:13:25 2016 GabrieleElectronicsGeneralPower outage?

This morning I found the cymac and the workstation rebooted, so I suspected a power cut in the last days. However, the function generator and the power supply for the QPD were off. So somebody must have turned them off.

Please write those actions in the elog!

  156   Fri Nov 4 08:11:57 2016 GabrieleGeneralMeasurementsS1600450

2016-11-04

  • 8:08am in chamber
  • 8:38am pumping down
  • 11:50am QUIET 1162320651 (11:50:34) + 30s, EXCITATION at 1162320710 this excitation didn't wotk very well
  • 12:40pm EXCITATION at 1162323596, again it doesn't look good
  • 2:00pm: measured Q are very low, it's very hard to excite the first mode. Stopping pumps
  • 2:41pm, venting
  • 2:45pm, removing sample

Results

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
2527.2        2.4665e+06        2.4648e+06        2.4683e+06
4401.5        1.6292e+06        1.6026e+06        1.6567e+06
4467.5        2.0848e+05        2.0822e+05        2.0874e+05
6713.6        4.6050e+05        4.6008e+05        4.6092e+05
6724.0        2.0244e+06        2.0163e+06        2.0326e+06
14079.4       3.7887e+06        3.7784e+06        3.7992e+06
15977.6       2.5322e+06        2.5321e+06        2.5322e+06
16204.9       7.6919e+05        7.6917e+05        7.6922e+05
24542.5       6.0480e+05        6.0479e+05        6.0482e+05
26955.4       1.7958e+06        1.7958e+06        1.7958e+06
28775.0       9.3100e+05        9.3098e+05        9.3102e+05

 

 

 

Attachment 3: ringdowns.png
ringdowns.png
  155   Tue Nov 1 15:34:49 2016 Alena, CalumGeneral Annealing run

Annealing run (449-453) on 3" wafers - Crime 11/01/2016 https://dcc.ligo.org/T1600507

  154   Mon Oct 31 12:51:13 2016 GabrieleGeneralMeasurementsSimulation of dilution factor and measured loss angles

I made a COMSOL simulation of our wafer (75 mm with flats, 1 mm thick) with a 1 micron thick coating (Tantala), and computed the dilution factor (E_coating / E_total). The result is shown in the plot below:

The dilution factor is slighly mode dependent, around a value of 5.7e-3.

The Q we measured on the latest two annealed wafers are in the range of 5e6 - 10e6 for the good modes, meaning that the total loss angle (subtrate, surface and edge combined) is 1e-7 - 2e-7.

Assuming an undoped tantala coating with loss angle of 4e-4 (http://authors.library.caltech.edu/55765/2/1501.06371.pdf), the disk loss angle after coating will be 2.2e-6, a factor 5 to 10 higher than our uncoated and annealed wafers.

So we can use the wafers as they are for our measurements.

 

  153   Sun Oct 30 17:05:47 2016 GabrieleGeneralMeasurementsS1600448 before and after annealing

The plot above compares the measured Q for #448 (second batch, flat machined during production), before and after annealing. The annealing improves significantly all Q's.

  152   Sat Oct 29 10:18:41 2016 GabrieleGeneralMeasurementsS1600447 before and after annealing

The plot above compares the measured Q for #447 (second batch, flat machined during production), before and after annealing. The annealing improves significantly all Q's.

 

  151   Sat Oct 29 10:12:39 2016 GabrieleGeneralMeasurementsS1600448 post annealing

2016-10-29

  • venting at 10:00am 10/29
  • sample installed, pumping down started at 10:12am, turbo pump on at 10:29am
  • Started automatic excitation at 10:46am. The first excitation will go off in 2 hours, then more at intervals of three hours. Amplitude 3kV, duration 30s

As with #447, the wafer moved during pum down. I clearly saw that the beam was moving as if the disk got kicked and rang down. Not sure what's going on, I've never seen such a behavior in past pump downs

Excitation at 1161805607 (30 s)
Excitation at 1161820052 (30 s)

There is something strange happening at frequencies below a few kHz. I tried stopping the autocenter, but that's not what is causing the problem. It looks like some king of saturations.

2016-10-30

I tried to move the beam, but I still see the same behavior in the spectrum. I think the disk has shift and it now touching the ESD. Stopped all pumps at 11:58am.

Chamber open at 12:50pm. I realigned all the optical setup to the horizontal reference, and moved the ESD a bit up. The sample was installed and leveled at 1:10pm, started again pumping down at ~1:12pm. Turbo pump started at ~1:19pm.

When the frequency of the turbo pump gets to ~150-200 Hz, the wafer gets highly excited. Apart from that and the slow drift of the QPD signals that is almost always present, everything looks ok.

Started autocentering at 1:27pm. Started a set of automatic excitations: initial wait is 2 hours, then three excitation intervalled by 3 hours wait, each 30s long at 3kV.

I noticed once again that switching on the IGM vacuum gauge moved the disk.

List of excitation times:

  • Excitation at 1161901681 (30 s)
  • Excitation at 1161912526 (30 s)
  • Excitation at 1161923370 (30 s)

2016-11-01

Excited at 7:56pm, duration 60s, amplitude 3kV

Results

Excitation at 1161901681 (30 s)

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1111.6        8.3731e+06        8.3256e+06        8.4210e+06
2591.0        8.2131e+05        8.0451e+05        8.3882e+05
4440.0        4.2299e+06        4.2263e+06        4.2335e+06
6773.1        3.2093e+06        3.2065e+06        3.2121e+06
6851.1        2.3048e+06        2.2687e+06        2.3421e+06
9538.3        2.5313e+06        2.5159e+06        2.5469e+06
14207.1       8.7731e+06        8.7408e+06        8.8057e+06
16115.0       2.6277e+06        2.6276e+06        2.6278e+06
16131.2       1.0409e+07        1.0379e+07        1.0439e+07
16344.5       2.1568e+06        2.1496e+06        2.1640e+06
18681.9       5.9537e+06        5.9390e+06        5.9685e+06
21409.8       7.7496e+06        7.7163e+06        7.7832e+06
23619.8       4.7146e+06        4.6909e+06        4.7386e+06
24106.0       1.7430e+06        1.7430e+06        1.7430e+06
24750.5       1.3804e+06        1.3804e+06        1.3804e+06
27200.5       5.4690e+06        5.4689e+06        5.4691e+06
28928.5       3.1942e+06        3.1941e+06        3.1942e+06
29029.0       2.2298e+06        2.2298e+06        2.2299e+06
29638.0       1.5518e+06        1.5518e+06        1.5518e+06
30320.6       1.9414e+06        1.9413e+06        1.9414e+06
31178.0       8.7520e+05        8.7519e+05        8.7522e+05

Results from the measurement on 11/01

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1112.0        9.3290e+06        9.3025e+06        9.3556e+06
2549.7        6.1599e+06        6.1549e+06        6.1648e+06
2591.0        1.0033e+06        9.9970e+05        1.0070e+06
4440.3        4.3031e+06        4.3021e+06        4.3041e+06
4508.3        1.7553e+05        1.7503e+05        1.7602e+05
6773.0        3.3336e+06        3.3331e+06        3.3341e+06
6789.2        4.1646e+06        4.1566e+06        4.1727e+06
6851.2        2.4309e+06        2.4265e+06        2.4353e+06
9538.7        2.5711e+06        2.5677e+06        2.5745e+06
10233.2       3.5483e+05        3.5481e+05        3.5485e+05
10390.0       1.3584e+06        1.3537e+06        1.3632e+06
12728.4       1.8895e+06        1.8895e+06        1.8896e+06
14207.0       8.8861e+06        8.8676e+06        8.9047e+06
16115.5       2.7365e+06        2.7200e+06        2.7533e+06
16131.5       1.0602e+07        1.0564e+07        1.0640e+07
16344.7       2.2292e+06        2.2184e+06        2.2401e+06
18682.0       6.7655e+06        6.7553e+06        6.7756e+06
20331.9       1.6072e+06        1.6011e+06        1.6134e+06
23620.0       5.5499e+06        5.5263e+06        5.5736e+06
24750.6       1.5454e+06        1.5453e+06        1.5454e+06
27201.0       6.6957e+06        6.6956e+06        6.6958e+06
28929.0       2.6420e+06        2.6419e+06        2.6420e+06
29029.4       1.7762e+06        1.7762e+06        1.7763e+06
29133.8       9.1385e+06        9.0987e+06        9.1787e+06
29406.0       9.3479e+06        9.3477e+06        9.3480e+06
29601.0       5.6104e+05        5.6103e+05        5.6105e+05
  150   Fri Oct 28 21:20:48 2016 GabrieleGeneralMeasurementsS1600447 post annealing

Installation

I had some problems in installing the wafer. I balanced it and started the pump down a couple of times, and the wafer moved so that the beam coming out of the chamber was clipping.

I decided to re-align the optical setup again. As before, I used a small container with water to have the horizontal reference, and aligned the output optics to center on the QPD. I also added a iris before the mirror with the picomotors, as additional reference.

During pump down I noticed a few sudden jumps of the QPD signals. The output beam moved a lot again, so my realignment didn't help. I even tried to slow down the pump, but this didn't help either. To recover the beam on the pick-off mirror, I had to move a bit the upper periscope mirror. So my horizontal reference is no more good.

It's not clear what's going on, but I'll keep pumping down.

  • installed on 10/28 at 9:00pm, pumping down. Turbo started at 9:09pm, The beam is slowly drifting but nothing to be worried about. Pressure is 5.9e-6 Tor at 9:20pm.
  • autocentering script on at 9:18pm
  • started a set of measurements at 9:20pm. Three excitations (3 kV, 30s). The first one will start in 2h, then the others will follow with an interval of three hours between them. A python script (auto_excite.py) is running on the workstation
  • stopped pumps at 9:30 am 10/29

I noticed another strange thing: when I switchec the IGM vacuum gauge on, the QPD signal changed, as if the beam moved. See figure below.

Measurements

Excitation at 1161757257 (30 s)
Excitation at 1161757309 (30 s)
Excitation at 1161757361 (30 s)

Something went wrog with the script (some python issue I still don't understand) so the three excitations were executed in sequence. In summary, only one ring-down measurement.

Results

Here are the plots from the ringdown measurement:

And the fitted Q factors:

% Freq        Q                 Q (C.I. 95%)      Q (C.I. 95%)
1115.3        1.2185e+07        1.2167e+07        1.2202e+07
2558.9        4.1466e+06        4.1430e+06        4.1501e+06
4456.9        2.5958e+06        2.5927e+06        2.5989e+06
4523.6        9.6000e+04        9.5990e+04        9.6011e+04
6798.5        1.9687e+06        1.9596e+06        1.9777e+06
6813.2        7.7644e+06        7.7608e+06        7.7680e+06
6876.3        1.0955e+06        1.0947e+06        1.0963e+06
9575.1        2.5100e+06        2.5061e+06        2.5139e+06
10270.5       8.1293e+06        8.0671e+06        8.1925e+06
12904.0       2.8481e+05        2.8480e+05        2.8482e+05
14259.5       4.9009e+06        4.8836e+06        4.9184e+06
16176.3       1.6116e+06        1.6097e+06        1.6135e+06
16187.8       5.7721e+06        5.7689e+06        5.7753e+06
16406.5       1.8723e+06        1.8676e+06        1.8769e+06
18751.4       1.0901e+06        1.0900e+06        1.0901e+06
20410.0       5.4342e+05        5.4341e+05        5.4343e+05
21485.0       7.3955e+06        7.3284e+06        7.4639e+06
23709.9       5.1619e+06        5.1426e+06        5.1813e+06
24845.0       1.3831e+06        1.3787e+06        1.3876e+06
29140.4       2.1742e+06        2.1742e+06        2.1742e+06
29231.0       6.8560e+06        6.8559e+06        6.8562e+06

 

 

Attachment 5: Qs.png
Qs.png
  149   Thu Oct 27 14:02:38 2016 AlenaGeneralGeneralAnnealing

Annealing run (447-448) on 3" wafers - Crime 10/27/2016 https://dcc.ligo.org/T1600485-v1

 

  148   Tue Oct 25 11:10:37 2016 GabrieleGeneralMeasurementsImage of S1600433

This is an image of the sample S1600433 under the microscope, courtesy of GariLynn:

Link to IMG_3150.JPG

The scale in the image is 20 microns per divison, 2 mm full scale

Attachment 1: IMG_3150.JPG
IMG_3150.JPG
  147   Tue Oct 25 09:12:31 2016 GabrieleGeneralMeasurementsComparison of first and second batch

The plot below compares a sample from the first batch and two samples from the second batch. All samples are as received from Mark Optics, no annealing or any other treatment.

Both samples in the second batch show consistently and significantly lower Q values.

GariLynn and I inspected the two samples under the microscope. Surprisingly, the edges and the flats look much better than the samples from the first batch. See elog 148 for an image of a sample from the first batch

Link to IMG_3158.JPG

Link to IMG_3157.JPG

Link to IMG_3156.JPG

Link to IMG_3155.JPG

Attachment 2: IMG_3155.JPG
IMG_3155.JPG
Attachment 3: IMG_3158.JPG
IMG_3158.JPG
Attachment 4: IMG_3157.JPG
IMG_3157.JPG
Attachment 5: IMG_3156.JPG
IMG_3156.JPG
Attachment 6: IMG_3155.JPG
IMG_3155.JPG
  146   Mon Oct 24 16:32:01 2016 GabrieleGeneralMeasurementsS1600448

Sample S1600447, as received from Mark Optics, second batch

  • in chamber, pumping down at 4:30pm (2016-10-24)
  • pumps stopped at 9:18am (2016-10-25)
  • vented, sample of the chamber at 10:00aa

Summary

Measured Q values are low.

2016-10-24

  • excited at 8:38:48pm, amplitude 3 kV, duration 30s

2016-10-25

  • excited at 8:05:20am, amplitude 3kV, duration 30s

  145   Mon Oct 24 14:33:46 2016 GabrieleGeneralMeasurementsEffect of annealing: Q increases

S1600439 has been measured as received (before annealing, elog 137) and after annealing (elog 144). 

Q values are significantly increased for almost all modes, see the plot below for a comparison. Only modes with low Q are not improved.

  144   Mon Oct 24 10:26:30 2016 GabrieleGeneralMeasurementsS1600439

S1600439, post annealing

Measurements before annealing reported in elog 137. Details on the annealing run here: T1600476

Installation

  • at 10:15am turbo pump switched off
  • installed at 11:15am, pumping down
  • pumps stopped at 2:49pm
  • sample out of the chamber at 4:25pm

Measurements

  • excited at 1:05:40pm, amplitude 3kV, duration 30 s

All Q values are increased with respect to pre-annealing

  143   Fri Oct 21 15:27:15 2016 GabrieleElectronicsConfigurationRemoved low pass filter in SUM

I removed the low pass filter in the QPD SUM signal, used for normalization. This reduced a lot the bump at ~20kHz due to laser intensity noise.

I also switched off the 500 Hz high pass filters in the X_NORM and Y_NORM signals.

  142   Fri Oct 21 14:03:17 2016 GabrieleGeneralVacuumRoughing pump moved

I moved the roughing pump out of the clean room, adding an extension hose.

 

This reduced a lot the vibrations induced by the pump. In the past when the pump was running we often saw very large noise, see the red trace in the figure below. Now, in the same conditions, we get the blue trace, which is much better.

The plot below shows a comparison of different configurations:

  • blue: what I sometimes manage to get tewking the pump position and keeping it on top of a plastic box
  • red: now, with the pump far away
  • green: with the pump off

We are quite close to the pump off condition.

  141   Fri Oct 21 13:45:21 2016 GabrieleGeneralMeasurementsS1600447

Sample S1600447, as received from Mark Optics, second batch

Measurements

  • Installed into the chamber, pumping down started at ~1:10pm

2016-10-21

  • Excited at 3:38pm, amplitude 2kV, duration 30 s
  • Excited at 5:01:30pm, amplitude 3kV, duration 30 s
  • Excited at 9:11:30pm, amplitude 3kV, duration 30 s

2016-10-23

  • Excited at 9:34:38am, amplitude 3kV duration 30 s

Results

All measured Q values are very low. Details below, here's a summary of all four measurements:

2016-10-21 3:38pm

2016-10-21 5:01pm

2016-10-21 9:11pm

  140   Thu Oct 20 14:38:24 2016 GabrieleCleanDaily ProgressCleaning of S1600433 and S1600438

Samples #433 (annealed and cleaned) and #438 (as received from Mark Optics) are now with GariLynn for deep cleaning.

Sample #438 was broken during annealing.

  139   Thu Oct 20 11:04:03 2016 GabrieleGeneralMeasurementsSample with flame polished edges

Sample with edges flame polished in Glasgow

Installation

  • into the chamber and balanced at 11am. Pump down started at 11:00am.
  • it looks like the turbo pump shaked the sample too much and moved it significantly. At 11:44am I had to tweak a bit the input steering periscope to avoid the outgoing beam to be clipped on the pickoff mirror
  • roughing pump off at 2:27pm
  • excitation at 2:36pm (2000 V, 30 s)

Results

% Freq        First Q of pair   Second Q of pair
1117.4        2.3392e+07        2.3392e+07
2555.9        1.8650e+07        1.8650e+07
4441.1        1.3003e+07        1.3003e+07
6759.2        1.6003e+07        1.5656e+07
6781.8        1.4795e+07        1.4795e+07
9499.2        5.6765e+06        5.6765e+06
10219.5       1.3148e+07        2.7060e+06
10222.3       1.3909e+07        4.2609e+04
11444.0       2.0756e+06        6.5364e+05
12649.4       1.0264e+07        8.7228e+06
12650.7       8.6808e+06        8.6808e+06
14176.3       1.0290e+07        1.0290e+07
14177.5       1.0185e+07        1.0185e+07
16113.7       1.0856e+07        9.7535e+06
16202.5       8.6733e+06        5.0176e+06
18619.0       1.3113e+07        1.3113e+07
18622.1       1.4864e+07        1.4864e+07
20149.0       1.4047e+06        1.4047e+06
21348.8       6.9944e+06        6.9944e+06
21353.3       8.0679e+06        3.1734e+05
23529.5       1.3076e+07        1.3076e+07
24482.3       9.6841e+06        9.6841e+06
24669.1       4.8629e+06        4.8629e+06
24670.5       6.3609e+06        6.3609e+06
25499.2       5.2216e+06        5.2216e+06
25828.0       3.3780e+06        3.3780e+06
27101.0       1.4934e+07        1.4934e+07
27103.5       1.4956e+07        1.4956e+07
28883.5       1.2076e+07        1.2076e+07
29068.6       1.1494e+07        1.1494e+07
29072.0       9.7555e+06        9.7555e+06
29190.0       5.9610e+06        5.9610e+06
29193.2       7.9280e+06        7.9280e+06
29502.2       7.8254e+06        7.8254e+06
30867.0       6.3681e+06        6.3681e+06
31267.0       1.6836e+06        1.4541e+05
32194.4       5.3275e+06        5.3275e+06
32200.0       5.9215e+06        2.6587e+06

The following plot compares the Q measured on this sample yesterday here at Caltech with the GeNS system, with the measurement perfomed by Raymond Robie in Glasgow.

- blue dots: measurements on the flame polished sample here at Caltech
- orange crosses and yellow triangles: Raymond’s measurements on the flame polished sample at in Glasgow (after annealing)
- purple crosses: typical Q values measured on disk samples (not annealed nor flame polished) here at Caltech

Flame polishing of the edges did not change significantly the Q we measure with the GeNS system. However, the GeNS system rovide systematically higher Q values for basically all measurable modes.

 

Attachment 7: ringdown_raw_data_2016_10_20.m
%% Parameters
prefix = '2016_10_20';  % name of the folder where result will be saved
gps0 = 1161034552;      % GPS time of clean data before excitation
gps1 = 1161034619;      % GPS time right after excitation
dt = 30;                % how much data to be used to search peaks

minsnr = 6;             % minimum peak SNR
minfr = 1000;           % minimum peak frequency
Dt = 3600;              % total amount of time for the ringdown measurement

... 303 more lines ...
  138   Wed Oct 19 17:08:47 2016 GabrieleGeneralMeasurementsS1600433 vs S1600438
  • S1600433 has been annealed, was contaminated by the iron oxide, and it was cleaned using first contact. No residual were visible on the surface during a simple eye inspection (no flash light)
  • S1600438 is as received from Mark Optics. Some particules are visible on the surfaces with a flash light

The plot below compares the Q values measured today for the two disks. The disk that was annealed and cleaned clearly shows lower Q's for almost all modes.

  137   Wed Oct 19 16:40:24 2016 sults:GeneralMeasurementsS1600349

S1600439, not annealed, as received from Mark Optics

Installation

  • installed and balanced, pump down started at 4:38pm (roughing pump), turbo started at 4:51pm
  • removed from the chamber on 10/20 at about 11:00am

Measurements

2016_10_19

  • QPD centered at 9:25pm, excited (2000 V, 10 s) at 9:27pm, measurement ongoing.

The spectrum was noise than usual due to the roughing pump. I already found out in the past that I can reduce the noise by tweaking the position of the pump. This time however I wasn't successful.

Here are the results:

% Freq        Q                 Qlow (C.I. 95%)   Qhi (C.I. 95%)
1111.5        6.0958e+06        6.0641e+06        6.1279e+06
2549.6        3.6416e+06        3.6305e+06        3.6528e+06
4441.7        2.6916e+06        2.6879e+06        2.6953e+06
4512.9        2.1090e+05        2.0993e+05        2.1188e+05
6777.5        1.1797e+06        1.1790e+06        1.1803e+06
6790.9        3.8621e+06        3.8540e+06        3.8701e+06
6858.4        1.2434e+06        1.2295e+06        1.2577e+06
9548.0        1.2177e+05        1.1878e+05        1.2491e+05
10234.6       3.9934e+05        3.9351e+05        4.0535e+05
10399.0       2.8135e+05        2.7455e+05        2.8849e+05
12744.2       1.3145e+06        1.3115e+06        1.3174e+06
14211.3       3.8414e+06        3.8136e+06        3.8696e+06
16123.3       2.0276e+06        2.0181e+06        2.0372e+06
16135.8       5.2811e+06        5.2770e+06        5.2852e+06
16370.0       1.4976e+06        1.4922e+06        1.5031e+06
18689.3       4.2954e+06        4.2738e+06        4.3172e+06
23632.0       2.2796e+06        2.2528e+06        2.3070e+06
24797.4       8.7545e+05        8.5819e+05        8.9341e+05
27214.5       1.2566e+06        1.2374e+06        1.2764e+06
28947.5       1.7367e+06        1.7130e+06        1.7611e+06
29144.0       3.2148e+06        3.1213e+06        3.3142e+06

 

2016_10_20

  • Roughing pump was creating too much noise, switched it off at 8:30am
  • Excitation at 8:35am (2000 V, 30 s)

Here are the results:

And the measured Q values:

% Freq        Q                 Qlow (C.I. 95%)   Qhi (C.I. 95%)
1111.4        6.2206e+06        6.2061e+06        6.2351e+06
2549.6        4.1538e+06        4.1498e+06        4.1579e+06
2592.9        1.0952e+06        1.0887e+06        1.1017e+06
4441.7        2.8521e+06        2.8513e+06        2.8529e+06
4513.0        2.0592e+05        2.0455e+05        2.0730e+05
6777.5        1.1013e+06        1.1006e+06        1.1020e+06
6790.9        3.9913e+06        3.9879e+06        3.9947e+06
6858.2        1.3100e+06        1.3078e+06        1.3122e+06
9547.8        1.2492e+06        1.2469e+06        1.2514e+06
10234.7       3.4336e+06        3.4209e+06        3.4463e+06
10398.7       4.3217e+05        3.2860e+05        6.3104e+05
12744.2       4.5274e+05        4.5177e+05        4.5371e+05
14211.3       2.0254e+06        2.0081e+06        2.0430e+06
16123.0       2.1225e+06        2.1173e+06        2.1276e+06
16135.8       4.6547e+06        4.6529e+06        4.6564e+06
16370.3       1.4781e+06        1.4762e+06        1.4800e+06
18689.2       4.5978e+06        4.5891e+06        4.6064e+06
20299.5       4.1859e+05        4.1375e+05        4.2353e+05
20364.6       1.1099e+06        1.0630e+06        1.1612e+06
21418.2       4.5814e+06        4.5718e+06        4.5911e+06
23631.9       2.8907e+06        2.8700e+06        2.9116e+06
24797.4       1.1241e+06        1.1121e+06        1.1363e+06
27214.5       2.1015e+06        2.0752e+06        2.1285e+06
28947.3       2.1285e+06        2.1162e+06        2.1410e+06
29054.7       1.4873e+06        1.4631e+06        1.5124e+06
29143.8       4.1250e+06        4.1050e+06        4.1453e+06
29647.5       4.5456e+05        4.4215e+05        4.6768e+05
31135.4       7.5136e+05        7.3331e+05        7.7033e+05
32013.4       1.1846e+06        1.1565e+06        1.2140e+06
Attachment 9: ringdown_rawdata_2016_10_19.m
%% Parameters
prefix = '2016_10_19';  % name of the folder where result will be saved
gps0 = 1160972805;      % GPS time of clean data before excitation
gps1 = 1160972852;      % GPS time right after excitation
dt = 30;                % how much data to be used to search peaks

minsnr = 6;             % minimum peak SNR
minfr = 1000;           % minimum peak frequency
Dt = 3600;              % total amount of time for the ringdown measurement

... 274 more lines ...
Attachment 10: ringdown_rawdata_2016_10_20.m
%% Parameters
prefix = '2016_10_20';  % name of the folder where result will be saved
gps0 = 1161012900;      % GPS time of clean data before excitation
gps1 = 1161012972;      % GPS time right after excitation
dt = 30;                % how much data to be used to search peaks

minsnr = 6;             % minimum peak SNR
minfr = 1000;           % minimum peak frequency
Dt = 3600;              % total amount of time for the ringdown measurement

... 274 more lines ...
  136   Wed Oct 19 13:35:23 2016 GabrieleGeneralMeasurementsS1600438

S1600438, not annealed, as received from Mark Optics

Installation

  • Turbo pump switched off at 11:42am (2016-10-19)
  • Turbo pumpo stopped (finally) at 1:11pm
  • Chamber vented and opened at 1:13pm
  • Sample installed and balanced at 1:18pm
  • Chamber closed, roughing pump on at 1:20pm, turbo pump on at 1:35pm
  • At 2:40pm pressure is about 2e-6 Torr
  • Excited at 2:54pm, results are being saved in ~/Measurements/S1600438/2016_10_19/ringdown_3pm_*
  • Roughing pump off at 3:57pm, turbo pump switched off
  • at 4:27pm the pump spins at 120 Hz, opening the venting valve slowly, the turbo pump went down to 0 Hz in a couple of minutes
  • at 4:35pm the sample was removed
Clean data: 1160949234 + 30s
Right after excitation: 1160949284 + 30s

Data have been analyzed with the attached MATLAB script ringdown_rawdata_2016_10_19.m

Results are shown below:

% Freq        Q                 Qlow (C.I. 95%)   Qhi (C.I. 95%)
1114.5        8.6842e+06        8.6163e+06        8.7530e+06
2600.0        1.5373e+06        1.5354e+06        1.5392e+06
4454.9        4.4458e+06        4.4439e+06        4.4476e+06
4526.4        3.1306e+05        3.1197e+05        3.1416e+05
6797.6        3.5778e+06        3.5758e+06        3.5799e+06
6809.8        9.1530e+06        9.1447e+06        9.1614e+06
6878.6        1.3829e+06        1.3784e+06        1.3873e+06
9576.6        3.0186e+06        3.0135e+06        3.0237e+06
10264.5       8.1674e+06        8.1534e+06        8.1815e+06
12782.6       2.5469e+06        2.5399e+06        2.5539e+06
14251.6       7.8253e+06        7.7982e+06        7.8525e+06
16171.7       3.3591e+06        3.3541e+06        3.3641e+06
16181.9       7.9905e+06        7.9842e+06        7.9969e+06
18743.0       5.4436e+06        5.3455e+06        5.5453e+06
20427.0       1.6445e+06        1.6275e+06        1.6618e+06
21479.0       3.0290e+06        2.9492e+06        3.1132e+06
21778.0       3.2835e+06        3.1820e+06        3.3918e+06
23700.5       3.6209e+06        3.5827e+06        3.6598e+06
27289.6       7.7802e+06        7.7398e+06        7.8211e+06
29031.4       4.5482e+06        4.5277e+06        4.5688e+06
29140.5       3.2060e+06        3.1774e+06        3.2352e+06
29225.4       8.4552e+06        8.3776e+06        8.5342e+06
29736.5       1.3035e+06        1.2968e+06        1.3103e+06
29786.7       1.7871e+06        1.7611e+06        1.8139e+06
31031.2       2.1918e+06        2.1512e+06        2.2338e+06
31920.7       6.5775e+06        6.5404e+06        6.6151e+06

 

 

Attachment 5: ringdown_rawdata_2016_10_19.m
%% Parameters
prefix = '2016_10_19';  % name of the folder where result will be saved
gps0 = 1160949234;      % GPS time of clean data before excitation
gps1 = 1160949284;      % GPS time right after excitation
dt = 30;                % how much data to be used to search peaks

minsnr = 6;             % minimum peak SNR
minfr = 1000;           % minimum peak frequency
Dt = 3600;              % total amount of time for the ringdown measurement

... 274 more lines ...
  135   Tue Oct 18 16:52:16 2016 GabrieleGeneralMeasurementsSample inspections from annealing run 10/10/2016

LIGO-T1600466

  • S1600432 shows some residual on face, close to the edge, probably from first contact
  • S1600433 looks ok
  • S1600434 shows a small residual on the face, the edge, probably from first contact, and a back spot, probably a residual of the contamination
  • S1600435 shows a large halo on the face, like what you get when solvents dry on the surface leaving some traces
  • S1600436 has some red residual on the edge, likely first contact
  • S1600437 the surface looks ok but the edge has a clear reddish color
  134   Tue Oct 18 16:29:37 2016 GabrieleGeneralMeasurementsS1600433

S1600433, annealing run 10/10/2016

Installation 

  • Installed in the measurement system, chamber closed
  • pump down started at 4:27pm LT
  • turbo pump started at 4:38pm
  • manually recentered the QPD at 4:39pm
  • HV amplifer turned on at 4:41pm.

NOTE: initally I opened the roughing pump valve just a bit, to avoid shaking the disk too much. The reflected beam was moving quite a lot, but after the pressure went below roughly 1/3 atm there was no visible motion anymore and I opened up the valve completely.

Attached a trend of the QPD signals during the pump down. The time of incresed noise was at the beginning of the pump down.

Measurements

2016-10-18

At 8:10pm, used the autocenter.py script to fine center the QPD. Cleaned the script log and started it again after the excitation.

Used the GUI to excite (amplitude 2000 V, duration 20s) and measure the ring downs at about 8:18pm. Results saved in ~/Measurements/S16004123/2016_10_18/ringdown_8pm_*

Clean reference time: 1160882205 + 30 s
Start of ringdown: 1160882395

The automated procedure did not identify many modes, I'll look at the result offline tomorrow.

Ringdown analyzed offline using the attached MATLAB script (ringdown_rawdata_2016_10_18.m). Some plots with the results:

The following plot shows the Q values, all quite low:

% Freq        Q
1111.8        3.4136e+06
2223.5        3.4789e+06
2550.2        1.9117e+06
2592.8        5.2546e+05
4442.2        1.3452e+06
6778.0        1.1197e+06
6789.2        5.4743e+06
6858.5        7.3921e+05
9548.2        7.9478e+05
10233.4       3.3426e+06
14209.2       3.6032e+06
16132.8       3.1556e+06
21414.5       4.9099e+06
27209.0       3.0791e+06
29136.6       5.4256e+06​

2016-10-19

  • Stopped autocentering at 7:45am
  • Excitation at 7:50am, ampltiude 1500 V, duration 30 s
  • Autocentering on right after the excitation
  • Measurement running, results saved in ~/Measurements/S16004123/2016_10_19/ringdown_8am_*

Ringdown analyzed offline using the attached MATLAB script (ringdown_rawdata_2016_10_19.m). Some plots with the results:

The following plot shows the Q values, all quite low:

% Freq        Q
1111.8        3.4159e+06
2550.2        1.9062e+06
2592.9        5.7773e+05
4442.3        1.3729e+06
6778.1        1.1435e+06
6789.5        5.8159e+06
6858.7        7.5672e+05
9548.4        8.9519e+05
10233.6       1.4926e+06
12744.3       7.9721e+05
14209.5       3.7492e+06
16123.8       1.0493e+06
16133.1       3.7737e+06
18686.6       1.7828e+06
21414.9       4.6938e+06
27209.6       3.5298e+06
29137.3       5.5508e+06
32020.0       1.8031e+06

2016-10-19

  • Excitation at 11:04am, ampltiude 2000 V, duration 30 s
  • Autocentering on during and after the excitation
  • Measurement running, results saved in ~/Measurements/S16004123/2016_10_19b/ringdown_11am_*
  • At 11:42am stopped the turbo pump

Ringdown analyzed offline using the attached MATLAB script (ringdown_rawdata_2016_10_19b.m). Some plots with the results:

The following plot shows the Q values, all quite low. Error bars are 95% confidence level from the fit.

% Freq        Q                 Qlow (C.I. 95%)   Qhi (C.I. 95%)
1111.7        3.4733e+06        3.4663e+06        3.4804e+06
2550.2        1.9189e+06        1.9141e+06        1.9238e+06
4442.2        1.3786e+06        1.3780e+06        1.3791e+06
4513.2        2.1947e+05        2.1809e+05        2.2087e+05
6778.1        1.1472e+06        1.1464e+06        1.1480e+06
6789.4        5.4143e+06        5.4015e+06        5.4272e+06
6858.7        7.9172e+05        7.8822e+05        7.9525e+05
9548.6        8.9155e+05        8.9070e+05        8.9240e+05
10233.8       1.4482e+06        1.4315e+06        1.4653e+06
12744.6       7.9081e+05        7.8886e+05        7.9276e+05
14209.6       3.7604e+06        3.7566e+06        3.7643e+06
16124.0       1.0353e+06        1.0331e+06        1.0374e+06
16133.3       3.8920e+06        3.8822e+06        3.9019e+06
16369.5       6.7332e+05        6.4937e+05        6.9910e+05
18687.0       2.0033e+06        1.9663e+06        2.0417e+06
20301.5       3.5757e+05        3.4389e+05        3.7239e+05
20366.0       5.7647e+05        5.6413e+05        5.8936e+05
23792.6       2.8356e+05        2.7808e+05        2.8927e+05
24798.0       4.9861e+05        4.9135e+05        5.0610e+05
27209.9       3.5452e+06        3.5176e+06        3.5732e+06
28945.0       1.3041e+06        1.2593e+06        1.3522e+06
29053.6       9.7020e+05        9.4791e+05        9.9356e+05
29137.7       5.4244e+06        5.3788e+06        5.4708e+06
31134.5       5.7329e+05        5.5971e+05        5.8754e+05
32019.6       1.9805e+06        1.9167e+06        2.0487e+06
Attachment 15: ringdown_rawdata_2016_10_18.m
%% Parameters
prefix = '2016_10_18';  % name of the folder where result will be saved
gps0 = 1160882205;      % GPS time of clean data before excitation
gps1 = 1160882395;      % GPS time right after excitation
dt = 30;                % how much data to be used to search peaks

minsnr = 6;             % minimum peak SNR
minfr = 1000;           % minimum peak frequency
Dt = 3600;              % total amount of time for the ringdown measurement

... 273 more lines ...
Attachment 16: ringdown_rawdata_2016_10_19.m
%% Parameters
prefix = '2016_10_19';  % name of the folder where result will be saved
gps0 = 1160923727;      % GPS time of clean data before excitation
gps1 = 1160923832;      % GPS time right after excitation
dt = 30;                % how much data to be used to search peaks

minsnr = 2;             % minimum peak SNR
minfr = 1000;           % minimum peak frequency
Dt = 3600;              % total amount of time for the ringdown measurement

... 275 more lines ...
Attachment 17: ringdown_rawdata_2016_10_19b.m
%% Parameters
prefix = '2016_10_19b';  % name of the folder where result will be saved
gps0 = 1160935440;      % GPS time of clean data before excitation
gps1 = 1160935526;      % GPS time right after excitation
dt = 30;                % how much data to be used to search peaks

minsnr = 5;             % minimum peak SNR
minfr = 1000;           % minimum peak frequency
Dt = 3600;              % total amount of time for the ringdown measurement

... 276 more lines ...
  133   Mon Oct 17 10:50:50 2016 GabrieleGeneralVacuumNo sign of problems in the electrostatic drive

I opened the chamber and took the etched disk out. Inspection of the electrostatic drive does not show any sign of burn or damage.

So it seems that the problem we had previously was due to contamination of the chamber (in the first case) or of the ESD (in the second case)

  132   Thu Sep 29 15:40:45 2016 GabrieleOpticsDesignBeam profile of new 21mW HeNe laser and tweak of optical lever design

I measured the beam profile of the new Thorlabs HeNe (21.8 mW measured). The beam waist is 355 microns, very close to the laser output port.

Using those numbers and the optical gain optimization algorithm, I tweaked the optical lever design. The simplest solution uses two lenses right after the laser to focus the beam down to about 300 microns on the QPD. The arm lever length is about 1.6 m, corresponding to an optical gain of about 18000/rad. I updated the DCC drawing in D1600213

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