| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
12204
|
Mon Jun 20 18:07:15 2016 |
gautam | Update | COC | Contrast as a function of RoC of ETMX |
|
|
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12219
|
Tue Jun 28 16:06:09 2016 |
gautam | Update | COC | RC folding mirrors - further checks | Having investigated the mode-overlap as
a function of RoC of the PRC and SRC folding
mirrors, I've now been looking into possible |
|
|
12223
|
Tue Jun 28 20:43:23 2016 |
Koji | Summary | COC | First Contact cleaning practice | Made a dry run of the in-situ cleaning
for a 3inch optic.
Attachment 1: The Al dummy mass |
7x |
|
12234
|
Thu Jun 30 16:21:32 2016 |
gautam | Update | COC | Sideband HOMs resonating in arms | [EricQ, gautam]
Last night, we set about trying
to see if we could measure and verify the |
|
|
12325
|
Fri Jul 22 03:02:37 2016 |
Koji | Update | COC | FC painting | [Koji Gautam]
We have worked on the FC painting
on ITMX and ITMY. We |
11x |
|
12407
|
Sat Aug 13 18:25:22 2016 |
gautam | Update | COC | RC folding mirrors - Numerical review | This elog
is meant to summarize my numerical simulations
for looking into the effects of curvature |
|
|
12413
|
Tue Aug 16 11:51:43 2016 |
gautam | Update | COC | RC folding mirrors - Numerical review | Summary of roundtable meeting yesterday
between EricG, EricQ, Koji and Gautam:
We identified two possible courses |
|
|
12414
|
Tue Aug 16 16:38:00 2016 |
gautam | Update | COC | RC folding mirrors - Numerical review | Here are the results for case 2: (flat
PR3/SR3, for purpose of simulation, I've
used a concave mirror with RoC in the range |
|
|
12417
|
Wed Aug 17 14:37:36 2016 |
gautam | Update | COC | RC folding mirrors - Numerical review |
|
|
|
12418
|
Wed Aug 17 16:28:46 2016 |
Koji | Update | COC | RC folding mirrors - Numerical review | For the given range of the PR3/SR3 RoCs
for both cases, all the resulting numbers
such as TMSs/mode matching ratios look reasonable |
|
|
12631
|
Mon Nov 21 15:34:24 2016 |
gautam | Update | COC | RC folding mirrors - updated specs |
p.p1 {margin:
0.0px 0.0px 0.0px 0.0px; font: 12.0px 'Helvetica
Neue'; -webkit-text-stroke: #000000}
li.li1 |
|
|
12847
|
Thu Feb 23 10:59:53 2017 |
gautam | Update | COC | RC folding mirrors - coating optimization | I've now made
a |
|
|
12887
|
Tue Mar 14 10:56:33 2017 |
gautam | Update | COC | RC folding mirrors - coating optimization | Rana suggested including some additional
terms to the cost function to penalize high
sensitivity to deviations in the layer thickness |
|
|
12936
|
Mon Apr 10 15:37:11 2017 |
gautam | Update | COC | RC folding mirrors - v3 of specs uploaded | Koji and I have been going over these calculations
again before we send a list of revised requirements
to Ramin. I've uploaded v3 of the specs |
8x |
|
13155
|
Mon Jul 31 23:39:02 2017 |
rana | Update | COC | Cavity Scan Simulation Code | Hiro Yamamoto has updated SIS (Static Interferometer
Simulation) to allow us to do the MCMC based
inference of the 40m arm cavity mirror maps. |
|
|
14148
|
Thu Aug 9 02:12:13 2018 |
gautam | Update | COC | South East or West? | Summary:
For operating the SRC in the "Signal-Recycled"
tuning, the SRC macroscopic length needs |
|
|
14164
|
Wed Aug 15 12:15:24 2018 |
gautam | Update | COC | Macroscopic SRC length for SR tuning | Summary:
It |
|
|
14314
|
Wed Nov 21 16:48:11 2018 |
gautam | Update | COC | EY mini cleanroom setup | With Chub's help, I've setup a
mini cleanroom at EY - Attachment
#1. The HEPA unit is running on |
|
|
15374
|
Thu Jun 4 00:21:28 2020 |
Koji | Summary | COC | ITM spares and New PR3 mirrors transported to Downs for phasemap measurement | GariLynn worked on the measurement of E1800089
mirrros.
|
|
|
15401
|
Tue Jun 16 13:05:36 2020 |
Koji | Update | COC | ITM spares and New PR3 mirrors transported to Downs for phasemap measurement | ITMU01 / ITMU02 as well as the five E1800089
mirrors came back to the 40m. Instead, the
two ETM spares (ETMU06 / ETMU08) were delivered |
|
|
15625
|
Wed Oct 14 13:28:04 2020 |
Koji | Update | COC | ITM/ETM spares in Downs | The two ITM spares and two ETM spares are
together stored in the optic storage (B110)
at Downs. c/o Liyuan and GariLynn |
|
|
3193
|
Mon Jul 12 11:20:56 2010 |
Gopal | HowTo | COMSOL Tips | Intrusions (Negative Extrusions) | For the sake of future users, I have decided
to periodically add tips and tricks in using
COMSOL that I have figured out, most probably |
6x |
|
3194
|
Mon Jul 12 12:16:50 2010 |
Dmass | HowTo | COMSOL Tips | Intrusions (Negative Extrusions) | An entry on the 40m wiki page might
serve you better, and be easier to sift
through once all is said and done |
|
|
3291
|
Mon Jul 26 11:15:23 2010 |
Gopal | HowTo | COMSOL Tips | Pictures from Transfer Function Tutorial on the Wiki | The attached pictures give a brief overview
of my transfer function measurement procedure
in COMSOL. For more details, please see the |
7x |
|
3322
|
Thu Jul 29 17:11:16 2010 |
Gopal | Update | COMSOL Tips | Including Gravity in COMSOL | [Gopal, Jan]
|
|
|
3536
|
Tue Sep 7 20:44:54 2010 |
Yoichi | HowTo | COMSOL Tips | COMSOL example for calculating mechanical transfer functions | I added COMSOL example files to the 40m
svn to demonstrate how to make transfer function
measurements in COMSOL. |
|
|
8190
|
Wed Feb 27 19:27:29 2013 |
Annalisa | HowTo | COMSOL Tips | Mirror support Eigenfrequency | I studied the eigenfrequencies of
a mirror support using COMSOL.
|
|
|
8226
|
Mon Mar 4 20:03:42 2013 |
Annalisa | HowTo | COMSOL Tips | Study of mirror mount eigenfrequencies | I studied the eigenfrequencies of
a mirror mount designed with COMSOL.
I imposed fixed constraints for the |
|
|
8437
|
Wed Apr 10 15:49:22 2013 |
Annalisa | Configuration | COMSOL Tips | Yend table eigenfrequency simulation with COMSOL | I made a Simulation with COMSOL for
the Yend table. Mainly, I tried to see how
the lower eigenmode changes with the number |
|
|
15650
|
Thu Oct 29 09:50:12 2020 |
anchal | Summary | Calibration | Preliminary calibration measurement taken | I went to 40m yesterday at around 2:30
pm and Koji showed me how to acquire lock
in different arms and for different lasers. |
|
|
16128
|
Mon May 10 10:57:54 2021 |
Anchal, Paco | Summary | Calibration | Using ALS beatnote for calibration, test | Test details:
We
locked both arms and opened the shutter for
Yend green laser.
After toggling |
|
|
16315
|
Tue Sep 7 18:00:54 2021 |
Tega | Summary | Calibration | System Identification via line injection | [paco]
This morning, I spent some time
restoring the jupyter notebook server running |
|
|
16352
|
Tue Sep 21 11:13:01 2021 |
Paco | Summary | Calibration | XARM calibration noise | Here are some plots from analyzing the
C1:LSC-XARM calibration. The experiment is
done with the XARM (POX) locked, a single |
|
|
16353
|
Wed Sep 22 11:43:04 2021 |
rana | Summary | Calibration | XARM calibration noise | I would expect to see some lower frequency
effects. i.e. we should look at the timeseries
of the demod with the excitation on and off. |
|
|
16363
|
Tue Sep 28 16:31:52 2021 |
Paco | Summary | Calibration | XARM OLTF (calibration) at 55.511 Hz | [anchal, paco]
Here is a demonstration of the
methods leading to the single (X)arm calibration |
|
|
16369
|
Thu Sep 30 18:04:31 2021 |
Paco | Summary | Calibration | XARM OLTF (calibration) with three lines | [anchal, paco]
We repeated the same procedure
as before, but with 3 different lines at |
|
|
16373
|
Mon Oct 4 15:50:31 2021 |
Hang | Update | Calibration | Fisher matrix estimation on XARM parameters | [Anchal, Hang]
What: Anchal and I measured the
XARM OLTF last Thursday. |
|
|
16399
|
Wed Oct 13 15:36:38 2021 |
Hang | Update | Calibration | XARM OLTF | We did a few quick XARM oltf measurements.
We excited C1:LSC-ETMX_EXC with a broadband
white noise upto 4 kHz. The timestamps for |
|
|
16957
|
Tue Jun 28 17:07:47 2022 |
Anchal | Update | Calibration | Added Beatnote channels in demodulation of c1cal | I added today demodulation of C1:LSC-BEATX/Y_FINE_I/Q
in the c1cal demodulation where different
degrees of freedom can be dithered. For McCal |
|
|
17010
|
Mon Jul 18 04:42:54 2022 |
Anchal | Update | Calibration | Error propagation to astrophysical parameters from detector calibration uncertainty | We can calculate how much detector calibration
uncertainty affects the estimation of astrophysical
parameters using the following method: |
|
|
17011
|
Mon Jul 18 15:17:51 2022 |
Hang | Update | Calibration | Error propagation to astrophysical parameters from detector calibration uncertainty | 1. In the error propogation equation, it
should be \Delta \Theta = -H^{-1} M \Delta
\Lambda, instead of the fractional error. |
|
|
17017
|
Tue Jul 19 07:34:46 2022 |
Anchal | Update | Calibration | Error propagation to astrophysical parameters from detector calibration uncertainty | Addressing the comments as numbered:
Yeah, that's correct,
that equation normally |
|
|
17029
|
Sun Jul 24 08:56:01 2022 |
Hang | Update | Calibration | Error propagation to astrophysical parameters from detector calibration uncertainty | Sorry I forgot to put tc & phic in
the example.
I modified astroFisherLib.py |
|
|
17221
|
Wed Nov 2 16:34:56 2022 |
Paco | Summary | Calibration | Single arm calibration run | [Anchal, Paco]
We added a notch filter on ETMY
(the actuation point of the YARM control |
|
|
17253
|
Thu Nov 10 17:40:31 2022 |
Paco | Summary | Calibration | Calibration Plan | Plan to calibrate single arm actuation
strength
Lock single arm cavity |
|
|
17257
|
Fri Nov 11 14:15:45 2022 |
Paco | Summary | Calibration | Single arm cal with 5 lines | I turned all the LSC oscillators on and
used the digital demod for BEATYF (fine y
als beat) to grab the data. For this I added |
|
|
17266
|
Tue Nov 15 11:04:01 2022 |
Paco | Summary | Calibration | Single arm cal with 5 lines | YALS Hardware inspection
The
ALS Cal for ITMY actuation was off by ~ 1000,
so I decided I don't trust / understand |
|
|
17291
|
Mon Nov 21 11:52:50 2022 |
Radhika | Summary | Calibration | Single arm cal with 5 lines | [Paco, Radhika]
We set out to realign the YARM
AUX laser input into the arm cavity. |
|
|
17328
|
Wed Nov 30 20:01:08 2022 |
rana | Summary | Calibration | Single arm cal with 5 lines | I don't think you need to record the
excitations. They are just sine waves. The
amplitude you can read off from the OSC screen. |
|
|
17329
|
Thu Dec 1 20:43:25 2022 |
Anchal | Summary | Calibration | Single arm cal with 5 lines | [Anchal, Paco]
We are doing this attempt again
in following configuration: |
|