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ID Date Authorup Type Category Subject Text Attachments
  2423   Tue Sep 10 20:03:02 2019 anchalDailyProgressNoiseBudgetLoss angle value updated again.As presented in LIGO-G1901676 and   ComparisonOfUsingDifferentLossAngles2.pdf 
  2424   Wed Sep 11 10:42:50 2019 anchalDailyProgressNoiseBudget500 Hz hump gone!

Checkout the latest noisebudget.
  
  2425   Fri Sep 13 16:40:56 2019 anchalDailyProgressBEATNew channel added; BNSignUpdate made better
I added C3:PSL-PRECAV_BEATNOTE_FREQ_SLOPE2
as a new channel. This holds the seconds
derivative of precavtybeatnote frequency
  
  2426   Fri Sep 13 16:46:54 2019 anchalSummaryTempCtrlCavity heater resistances remeasuredPresent understanding


CTN:2035
was the last measurement of cavity shield
  
  2427   Fri Sep 13 16:59:39 2019 anchalDailyProgressPMCSouth PMC Servo Card changesGain was way too low


The
header H1 was not shorted on the board.
This
reduced the gain of first stage to only 2,
  
  2428   Mon Sep 16 17:05:00 2019 anchalSummaryBEATBeatnote Frequency stabalizationOver the weekend, I ran Relay Tuning method
for the PID of beatnote frequency control.
After CTN:2426 this
 BeatnotePIDPerformance.pdf 
  2429   Mon Sep 16 18:03:33 2019 anchalNotesBEATQuick note: Detector changed to Sn101
Beatnote is stabalized to 27.3
MHz. Changing detector to SN101.
Reduced
South PMC Variable Gain to -2dB from -1dB
  
  2430   Fri Sep 20 18:34:19 2019 anchalNotesVacuumPossible reflected lights on upgradeAttached is a first attempt at tracing
the rays on reflection from the wedged and
tilted window together with the cavity mirror.
 CTNPrompReflectionAfterUpgrade.pdfCTNPrompReflectionAfterUpgrade.zip 
  2431   Tue Sep 24 15:40:33 2019 anchalDailyProgressNoiseBudgetAdding specifics of discepancy 2Today I ran the two codes with the same
parameter values to check if the effective
reflectivities calculated during the calculation
 ComparisonEffReflectivities.pdf 
  2432   Tue Sep 24 17:11:13 2019 anchalDailyProgressNoiseBudgetAdding specifics of discepancy 2 (More)Also, I found that the effective reflectivities
from the top surface of layers calculated
in Evans
 ComparisonEffReflectivitiesSignChange.pdf 
  2433   Tue Sep 24 19:39:06 2019 anchalDailyProgressNoiseBudgetChecking variation in estimated Coating Brownian Noise with Loss AnglesGabriele suggested that I plot the estimated
coating Brownian noise for different values
of bulk and shear loss angles and compare
 VariationOfCoatingBrownianNoiseEstimate.pdfVariationOfCoatingBrownianNoiseEstimate.zip 
  2434   Fri Sep 27 16:40:49 2019 anchalDailyProgressNoiseBudgetChecking variation in estimated Coating Brownian Noise with Loss Angles Better PlotsBetter Plots attached.  VariationOfCoatingBrownianNoiseEstimate.pdfVariationOfCoatingBrownianNoiseEstimate.zip 
  2435   Mon Sep 30 11:14:41 2019 anchalDailyProgressNoiseBudgetChecking variation in estimated Coating Brownian Noise with Loss Angles 2D Plots2D Heat Maps

Edit: Added comparison plot as
well.
 VariationOfCoatingBrownianNoiseEstimate2.pdfVariationOfCoatingBrownianNoiseEstimate2.zip 
  2437   Mon Sep 30 16:47:15 2019 anchalDailyProgressNoiseBudgetAdding links again; Comparison with Old Estimates on same plotWith comparison with old estimates:

CTN_Latest_BN_Spec_With_OldEst.pdf
  
  2438   Mon Sep 30 20:08:42 2019 anchalDailyProgressNoiseBudgetChecking variation in estimated Coating Brownian Noise with Beam RadiusVariation of the estimate of coating Brownian
noise as beam spot radius on the mirror changes.
Plotted in displacement noise as the frequency
 VariationOfCoatBrEstBeamRadius.pdfVariationOfCoatBrEstBeamRadius.zip 
  2439   Tue Oct 1 13:46:49 2019 anchalDailyProgressNoiseBudgetUsing bayesian inference to estimate loss AnglesI used the method described in Section
V of https://arxiv.org/abs/1406.4467,
to do a bayesian inference using mechanical
 BayesianAnalysis.pdfBayesianAnalysis.zip 
  2440   Tue Oct 1 17:28:25 2019 anchalNotesBEATQuick note: Moku connected with USBLiquid Instrument's Application Engineer
at La Jolla told me that connection with
moku might be mroe stable if it is directly
  
  2441   Wed Oct 2 12:22:44 2019 anchalDailyProgressBEATBeatnote Frequency long time series dataAfter the new PID parameters were tuned
(CTN:2428),
I waited for some time and the beatnote was
 BeatnoteLongTimeSeries.pdf 
  2442   Wed Oct 2 15:13:27 2019 anchalDailyProgressNoiseBudgetChecking variation in estimated Coating Brownian Noise with Beam RadiusI updated this calculation by adding curves
for contribution through bulk loss angle
and shear loss angle separately. Rana suspected
 VariationOfCoatBrEstBeamRadius.pdfVariationOfCoatBrEstBeamRadiusv2.zip 
  2443   Wed Oct 2 19:09:31 2019 anchalDailyProgressFSSTTFSS OLTFs; Repeated this 5 year old measurementI repeated the measurement done by Tara
and Evan to update residual NPRO noise in
our noise budget.
 FSS_OLTF.pdf 
  2444   Fri Oct 4 13:41:44 2019 anchalNotesFSSFSS Plant ModelI and Ian discussed what the transfer functions
would look like. Then today, using some old
calculations, I put up this notebook which
 FSS_Plant_Zero_Sim.pdfPlantModel.pdfPlantModel.zip 
  2447   Tue Oct 8 10:41:43 2019 anchalNotesFSSFSS Plant ModelThe nodes at input and output of buffer
in the PZT path are connected together. That
is wrong. Also, If possible, you should name
  
  2449   Wed Oct 9 16:08:39 2019 anchalDailyProgressBEATBeatnote Frequency long time series dataWhoever commented last, suggested a good
idea. So I've here plotted the NPRO slow
control voltage signals, converted into the
 BeatnoteLongTimeSeriesPart2.pdf 
  2450   Mon Oct 14 12:54:41 2019 anchalNotesFSSFSS Plant Model v2I have updated the plant model to contain
the cavity pole also. Cavity pole is a pair
of positive and negative real poles, so it
 FSS_Plant_Zero_Sim.pdfPlantModelv2.pdfPlantModelv2.zip 
  2451   Mon Oct 14 17:01:43 2019 anchalNotesLaserSouth Laser Switched Off!On Oct 11th at 15:04:04, the south laser
switched off on its own. I would like to
know if anyone entered the lab around this
 SouthLaserStopped.pdf 
  2452   Mon Oct 14 18:30:14 2019 anchalNotesPMCSouth PMC Error Signal OscillationsSouth PMC Error signal is showing huge
weird capacitor charging type oscillations.
Attached is an oscilloscope measurement of
 SPMCMixerOutOscillations.pdf 
  2453   Tue Oct 15 13:23:16 2019 anchalNotesSafetyQuick note: Shutting Down Lasers as Safety Sign is not workingFollowing up after CTN:2452,
the laser safety sign is not working. Hence
the lab has been shut down now. All lasers
  
  2454   Tue Oct 15 18:53:00 2019 anchalNotesSafetyQuick note: Lasers started againI have taken the bulb from ATF lab inside
sign for now. I'm ordering a new one
to replace that soon.
  
  2455   Tue Oct 15 18:54:16 2019 anchalNotesPMCSouth PMC further problemsWith Laser actuation not connected, I see
that the South PMC Servo board is acting
up. Firstly, it is not responding to changes
  
  2456   Wed Oct 16 16:56:43 2019 anchalNotesPMCSouth PMC won't work with it's own Servo Card onlyI have a wierd observation. The following
two combination work:


North
  
  2458   Wed Oct 16 18:46:58 2019 anchalNotesPMCSouth PMC started working somehow :(Yeah, the cables are isolated and no inversion
could happen.

  
  2460   Wed Oct 16 19:11:11 2019 anchalNotesBEATQuick note: Cavities locked; Changed BN Freq Counter Poll Rate
Follow discussion in thread 
CTN:2451.
Changed
polling rate of beatnote frequency counter
  
  2461   Fri Oct 18 17:47:49 2019 anchalNotesBEATQuick note: BN Noise bakc to where it was.Latest BN
Spectrum: CTN_Latest_BN_Spec.pdf

Daily
  
  2463   Wed Oct 23 13:21:12 2019 anchalDailyProgressNoiseBudgetFixed all discrepancies.I ran the code for aLIGO coating structure
and tried to reproduce fig5 and fig7 of Hong
 aLIGOComplexReflectivityVariationFig5.pdfaLIGOBreakDownThermalNoiseFig7.pdfaLIGOCoatingBrNoiseCalculations.zip 
  2464   Wed Oct 23 17:39:44 2019 anchalNotesPMCSouth PMC started working somehow :(The same thing happened again. This time,
not just with the SPMC actuation voltage,
but the South Laser slow voltage control
  
  2466   Fri Oct 25 16:50:12 2019 anchalNotesPMCSouth PMC problem debugging effortsToday, this problem happened again (check
history for details). I have done the following
investigative steps:
  
  2467   Tue Oct 29 19:10:59 2019 anchalNotesPMCSouth PMC problem debugging effortsI reduced the power falling on the PMC
to ensure the high signal level isn't
causing this problem. It was not. The problem
 SPMC_Diagnostics.pdf 
  2468   Wed Oct 30 15:15:28 2019 anchalNotesPMCReplacing U5A AD602 didn't solve the issue.I brought a new AD602AR from 40m and replaced
the U5A
AD602 which from the previous
  
  2469   Wed Oct 30 18:35:31 2019 anchalNotesPMCIssue closedIt turns out I did not have a full understanding
of the problem and it was not really a problem.
The blanking (pin 4) on U5A AD602 doesn't
  
  2470   Fri Nov 1 17:54:47 2019 anchalDailyProgressFSSFSS Diagnostics - RFPD RF Ouput under inspectionFirst step in FSS Diagnostics was to see
RF output from the RFPDs in FSS when they
are locked. I ran some extensive measurements
 NFSS_RFPD_Output_Oscilloscope.pdfSFSS_RFPD_Output_Oscilloscope.pdfNFSS_RFPD_RF_OUT_COUPLED.pdfSFSS_RFPD_RF_OUT_COUPLED.pdf 
  2471   Mon Nov 4 12:15:01 2019 anchalNotesPMCChanging the autolocking methodTrying gain sliding like 40m

Rana
told me that in 40m, the PMCs are autolocked
by reducing the gain of the loop and changing
  
  2472   Mon Nov 4 15:03:26 2019 anchalDailyProgressFSSRaised North TTFSS; Fixed the boxes.I raised the North TTFSS box by 6 inches
to make way for working on South box and
to reduce the congestion of connectors in
 signal-attachment-2019-11-04-161746.jpeg 
  2473   Mon Nov 4 20:13:44 2019 anchalNotesBEATQuick note: FSS Loop Gain ChangesSouth Common Gain: 24 dB! , Fast Gain:
14 dB

North Common Gain: 10 dB, Fast
  
  2474   Tue Nov 5 18:37:59 2019 anchalDailyProgressFSSFSS Diagnostics - TTFSS Testpoint Spectrum DataMeasurement method


All
measurements were taken withAG4395A for high
frequency and SR785 for low frequency and
 FSS_TP_Spectrum.pdf 
  2476   Sat Nov 9 19:28:36 2019 anchalDailyProgressFSSFSS Diagnostics - Loop nonlinearity TestMethod

I've
wrote this script, nonlinTF.py
which controls a Marconi 2023A and SR785
 NFSS_NonLinearity_Test.pngSFSS_NonLinearity_Test.pngsignal-attachment-2019-11-09-195635.jpeg 
  2477   Mon Nov 11 20:42:49 2019 anchalDailyProgressFSSFSS Diagnostics - Two Tone TestMethod


RFPD of the FSS loops were
tested through there Test input ports (Updated
 NFSS_RFPD_SN009_TF_11-11-2019_183131.pdfSFSS_RFPD_SN010_TF_11-11-2019_203310.pdfFSStwoToneTest.pdf 
  2478   Tue Nov 12 11:39:48 2019 anchalDailyProgressFSSFSS Diagnostics - RFPD RF Ouput under inspectionI calculated these values by integrating
in the 8 MHz neighborhood around the marked
harmonic peak, the power spectral density
  
  2479   Tue Nov 12 18:36:59 2019 anchalDailyProgressFSSFSS Diagnostics - Two Tone Third Order Intermodulation TestIn line with industrial practices, I did
two tone third order intermodulation test
today on the FSS RFPDs. This test was inspired
 FSStwoToneThirdOrderIM.pdf 
  2481   Tue Nov 19 18:51:02 2019 anchalDailyProgressFSSFSS Diagnostics - Second-order Distortion CalculationI did some theoretical calculations using
the datasheet value of second harmonic SFDR
 FSSDistortionCalc.pdfFSSDistortion.zip 
  2482   Wed Nov 27 13:59:24 2019 anchalDailyProgressFSSFSS Diagnostics - TTFSS TP1 TimeSeriesI took time-series data at TP1
on NFSS. This is just after
the elliptical filter which is after the
 NFSS_TP1_Oscilloscope.pdf 
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