| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
1938
|
Sun Oct 1 15:59:57 2017 |
rana | Misc | Computers | BURT | This is very similar to the BURT
and autoBURT system that we usually run with
EPICS. It does hourly snapshots of all settings |
|
|
1461
|
Tue Jul 29 11:40:09 2014 |
Evan | DailyProgress | optic | BRDF of AlGaAs mirror 143 | [Tara, Evan]
Yesterday we took a scatter measurement
of AlGaAs mirror #143. Instead of one bright |
|
|
1462
|
Wed Jul 30 17:47:56 2014 |
tara | DailyProgress | optic | BRDF of AlGaAs mirror 143 | I
used the setup to measure scattered loss
from an REO mirror (mirror for iLIGO refcav, |
|
|
1466
|
Tue Aug 5 08:14:14 2014 |
Evan | DailyProgress | optic | BRDF of AlGaAs mirror 141 after cleaning | Incident power: 20.0(1) mW
Exposure times used: 25 ms, 50 ms,
200 ms, 500 ms, 1000 ms |
|
|
1460
|
Sun Jul 27 19:46:16 2014 |
Evan | DailyProgress | optic | BRDF of AlGaAs mirror 137B1 | [Tara, Evan]
We replaced the Lambertian diffuser
with AlGaAs mirror 137B1. We intentionally |
|
|
1467
|
Tue Aug 5 14:54:36 2014 |
Evan | DailyProgress | optic | BRDF of AlGaAs mirror 132 after cleaning |
|
|
|
1465
|
Mon Aug 4 15:23:06 2014 |
Evan | DailyProgress | optic | BRDF of AlGaAs mirror 114 after cleaning | [Tara, Evan]
Tara also took a BRDF measurement
of #114 after cleaning it. |
|
|
1463
|
Thu Jul 31 09:40:24 2014 |
Evan | DailyProgress | optic | BRDF of AlGaAs mirror 114 | [Tara, Evan]
Tara took a BRDF measurement yesterday
of AlGaAs mirror #114. |
|
|
2085
|
Fri Feb 9 18:50:06 2018 |
awade, Craig | DailyProgress | BEAT | BN spectrum Feb 09, 2018 | These measurments followed some dumping
work around the refcav relfection photodiodes.
See, PSL:2084. |
|
|
2080
|
Thu Feb 8 16:48:07 2018 |
awade, Craig | DailyProgress | NoiseBudget | BN spectrum Feb 08, 2018 | Checking PLL OLG
Measured the
OLG using out1/out2 method. Did the
G/(1+G) invertion to OLG directly on the |
|
|
2532
|
Thu Feb 13 16:35:32 2020 |
anchal | DailyProgress | BEAT | BN Detector was saturated. Reduced laser powers. | I found that the beatnote detector was
actually saturating and the output was not
a good pure sinewave. I've reduced the |
|
|
1519
|
Mon Sep 15 18:29:47 2014 |
Evan | DailyProgress | BEAT | Attempts at scatter reduction | I went through the table today looking
for ghost beams. Most were already dumped.
For those that weren't, I put down a dump |
|
|
1521
|
Tue Sep 16 15:08:57 2014 |
Evan | DailyProgress | BEAT | Attempts at scatter reduction |
|
|
|
1361
|
Tue Oct 8 23:01:56 2013 |
Evan | DailyProgress | BEAT | Attempts at new beat measurement | [Tara, Evan]
Having successfully floated the table
yesterday, we attempted a new beat measurement |
|
|
1272
|
Thu Aug 1 03:34:35 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL | Today I worked on updating my progress
report and abstract. Posted to the SVN.
Our machined parts were finished |
|
|
1273
|
Thu Aug 1 18:33:12 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL | Today I tried to set up the TEC on the
actual assembly. When doing so, Tara pointed
out that I needed to have a separate temperature |
|
|
1277
|
Fri Aug 2 18:15:06 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL | Today I calibrated the PID gain on the
TEC. In order to do this, I used a silicone
heat sink compound to help the thermal conductivity |
|
|
1281
|
Mon Aug 5 18:47:04 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL | I brought in a different USB drive
to get data off of the oscilloscope. It took
awhile to figure out how to capture the data |
|
|
1283
|
Tue Aug 6 19:48:19 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL | I calculated a way to convert our
spectrum measurement of voltage from the
photodiode to the frequency noise of the |
|
|
1285
|
Wed Aug 7 18:13:21 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL |
|
|
|
1289
|
Thu Aug 8 18:43:44 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL | Today I designed a better circuit
to measure the TEC's response with the oscilloscope.
It is called a bridge circuit, and allows |
|
|
1292
|
Fri Aug 9 18:01:47 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL | I spent awhile reading about PID
controllers in order to understand how to
tune the TEC. P represents proportional gains, |
|
|
1297
|
Tue Aug 13 18:13:35 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL | Made some modifications to the Solidworks
design. All of these have been changed on
the SVN. |
|
|
1299
|
Thu Aug 15 18:53:45 2013 |
Chloe | DailyProgress | ECDL | Assembling ECDL |
|
|
|
2042
|
Thu Jan 11 13:31:36 2018 |
awade | Misc | Lab Infrastructure | Ants nesting in PSL lab | There are a large number of ants making
a trail from the ATF lab to the PSL lab.
They seem to be heading into a hole next |
|
|
2187
|
Tue May 15 16:53:36 2018 |
anchal | Notes | BEAT | Analysis for idea of sending beam at Brewster angle to Photo diode | Recently we were given the idea of sending
the beam to the photodiode at Brewster angle.
If we do so, ideally one particular polarization |
|
|
2188
|
Tue May 15 18:19:05 2018 |
Koji | Notes | BEAT | Analysis for idea of sending beam at Brewster angle to Photo diode | See https://dcc.ligo.org/LIGO-T1100564/public
See also: https://arxiv.org/abs/1710.07399
or https://doi.org/10.1364/AO.57.003372 |
|
|
246
|
Thu Jul 29 13:08:40 2010 |
tara | Notes | RefCav | Alignment is Off | This morning Megan tried to lock RefCav,
but the alignment was off. I realigned it,
and now it's locked. |
|
|
2347
|
Thu May 16 13:46:46 2019 |
anchal | DailyProgress | TempCtrl | Alignment disturbing due to lab temp changes | As suspected in CTN: 2346, the
mode matching of the cavities is deteriorating
and eventually alignment is getting screwed |
|
|
133
|
Thu May 27 18:20:42 2010 |
tarac | Laser | Laser | Aligning RefCav | I switched the cable from the 10W controller
to the original controller for 100 mW laser.
It is working well now, the cables are tied |
|
|
145
|
Thu Jun 3 23:55:38 2010 |
tarac | Laser | Laser | Aligning AOM 2: the Return of the Beam | I'm aligning
double pass AOM. After maximizing the power
of the 1st order of the transmitted beam, |
|
|
140
|
Thu Jun 3 00:52:37 2010 |
tarac | Laser | Laser | Aligning AOM | I'm aligning the AOM and maximizing
the diffracted beam's power by positioning
the AOM and adjusting the beam size by moving |
|
|
141
|
Thu Jun 3 08:42:44 2010 |
Frank | Laser | Laser | Aligning AOM |
|
|
|
142
|
Thu Jun 3 14:47:58 2010 |
Frank | Laser | Laser | Aligning AOM |
|
|
|
143
|
Thu Jun 3 15:45:39 2010 |
Frank | Laser | Laser | Aligning AOM |
|
|
|
144
|
Thu Jun 3 22:00:21 2010 |
Frank | Laser | Laser | Aligning AOM |
|
|
|
1495
|
Sat Aug 30 19:10:11 2014 |
Evan | DailyProgress | NoiseBudget | AlGaAs python noise budget: seismic coupling added | Same data and same isolation model as for
the silica/tantala noise budget. Since we
have new table legs, we should retake this |
|
|
1501
|
Thu Sep 4 11:47:42 2014 |
Evan | DailyProgress | NoiseBudget | AlGaAs python noise budget: photothermal TFs added | The first attachment shows the photothermal
TFs which take absorbed power (in watts)
to the mirror displacement (in meters) as |
|
|
1485
|
Mon Aug 25 20:54:38 2014 |
Evan | Notes | NoiseBudget | AlGaAs python noise budget: TO implemented |
|
|
|
1464
|
Sat Aug 2 23:07:39 2014 |
Evan | Notes | NoiseBudget | AlGaAs python noise budget | I have started a python implementation
of the AlGaAs noise budget. All parameters,
functions, etc. are defined in a single notebook, |
|
|
1482
|
Wed Aug 20 19:00:03 2014 |
Evan | Notes | NoiseBudget | AlGaAs python noise budget |
|
|
|
1468
|
Tue Aug 5 18:10:31 2014 |
Evan | DailyProgress | optic | AlGaAs mirror transmissions; optical contacting | I used the ThorLabs power meter to get
the transmission coefficients for the five
AlGaAs mirrors. |
|
|
1163
|
Tue Apr 30 01:15:26 2013 |
tara | Notes | NoiseBudget | AlAs/GaAs layer structure optimized for TO | I'm computing coating Brownian and
thermo optic noise (TO) in AlGaAs coatings
using GWINC code to compare it with the result |
|
|
1168
|
Thu May 2 03:03:48 2013 |
tara | Notes | NoiseBudget | AlAs/GaAs layer structure optimized for TO | [matt, tara] Got AlxGa1-xAs
material parameters from Matt Abernathy.
I plug the numbers (all in SI) in GWINC, |
|
|
1169
|
Thu May 2 23:40:46 2013 |
tara | Notes | NoiseBudget | AlAs/GaAs layer structure optimized for TO | I used GWINC code to calculate TO noise
in AlGaAs coatings, with some modifications
to the code I can get the result that is |
6x |
|
1170
|
Mon May 6 03:11:44 2013 |
tara | Notes | NoiseBudget | AlAs/GaAs layer structure optimized for TO | I checked the calculation for TO noise
in Cole etal people and found a few problems
that I didn't understand. |
|
|
1171
|
Mon May 6 17:08:25 2013 |
Matt A. | Notes | NoiseBudget | AlAs/GaAs layer structure optimized for TO | I sent this to Tara in an
email, but I thought I'd include it here
for posterity: |
|
|
1176
|
Tue May 14 02:06:15 2013 |
tara | Notes | NoiseBudget | AlAs/GaAs layer structure optimized for TO | [matt,tara] We compared the TO result
using GWINC, our results are similar (see
PSL:1170). |
|
|
1177
|
Wed May 15 20:07:12 2013 |
tara | Notes | NoiseBudget | AlAs/GaAs layer structure optimized for TO | We checked the half wave cap solution for
minimizing TO noise. WIth a half wave cap
of nl, the TO noise is smaller by ~ a factor |
|
|
1178
|
Tue May 21 01:06:43 2013 |
tara | Notes | NoiseBudget | AlAs/GaAs layer structure optimized for TO | I checked all the discrepancies in the
calculations between GWINC and that of Cole.
The issues are almost cleared, only the value |
|