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ID Date Author Type Categoryup Subject Text Attachments
  12102   Mon May 2 17:06:58 2016 ranaSummaryCOCG&H optics to Fullerton/HWS for anneal testingSteve sent 4 of our 1" diameter G&H
HR mirrors to Josh Smith at Fullerton for
scatter testing. Attached photo is our total
 20160427_182305.jpg 
  12103   Mon May 2 17:11:55 2016 ranaUpdateCOCRC folding mirrorsAntonio/Gautam
are now developing a more up to date Finesse
model of our recycling cavities to see what
  
  12120   Wed May 18 01:10:22 2016 gautamUpdateCOCFinesse modellingI've been working on putting together
a Finesse model for the current 40m configuration.
The idea was to see if I could reproduce
 arms.pdfPRC.pdfSRC.pdfFinesse_model.zip 
  12130   Tue May 24 22:49:02 2016 gautamUpdateCOCFinesse modelling - mode overlap scansSummary:

Having played around with a toy finesse
model, I went about setting up a model in
 9x 
  12131   Tue May 24 23:17:37 2016 ericqUpdateCOCFinesse modelling - mode overlap scansI think you should use the current actual
PRC & SRC cavity lengths as measured,
as it would be simplest to simply replace
  
  12190   Thu Jun 16 15:57:46 2016 gautamUpdateCOCContrast as a function of RoC of ETMXSummary

In a previous elog, I demonstrated
that the RoC mismatch between ETMX and
 contrastDefect.pdffinesseCode.zip 
  12193   Thu Jun 16 18:42:12 2016 ranaUpdateCOCContrast as a function of RoC of ETMXThat sounds weird. If the ETMY RoC   
  12194   Thu Jun 16 23:02:57 2016 gautamUpdateCOCContrast as a function of RoC of ETMX


 contrastDefect.pdf 
  12197   Mon Jun 20 01:38:04 2016 ranaUpdateCOCContrast as a function of RoC of ETMXSo, it seems that changing the ETMX for
one of the spares will change the contrast
defect from ~0.1% to 0.9%. True? Seems like
  
  12204   Mon Jun 20 18:07:15 2016 gautamUpdateCOCContrast as a function of RoC of ETMX


 contrastDefectComparison.pdf 
  12219   Tue Jun 28 16:06:09 2016 gautamUpdateCOCRC folding mirrors - further checksHaving investigated the mode-overlap as
a function of RoC of the PRC and SRC folding
mirrors, I've now been looking into possible
 C1_HOMcurves_Y.pdfC1_HOMcurves_DR.pdf 
  12223   Tue Jun 28 20:43:23 2016 KojiSummaryCOCFirst Contact cleaning practiceMade 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 gautamUpdateCOCSideband HOMs resonating in arms[EricQ, gautam]

Last night, we set about trying
to see if we could measure and verify the
 image.jpegC1_HOMcurves_Y.pdfC1_HOMcurves_X.pdf 
  12325   Fri Jul 22 03:02:37 2016 KojiUpdateCOCFC painting[Koji Gautam]

We have worked on the FC painting
on ITMX and ITMY. We
 11x 
  12407   Sat Aug 13 18:25:22 2016 gautamUpdateCOCRC folding mirrors - Numerical reviewThis elog
is meant to summarize my numerical simulations
for looking into the effects of curvature
 PRX_consolidated.pdfSRX_consolidated.pdfGouy_PRC.pdfGouy_SRC.pdf 
  12413   Tue Aug 16 11:51:43 2016 gautamUpdateCOCRC folding mirrors - Numerical reviewSummary of roundtable meeting yesterday
between EricG, EricQ, Koji and Gautam:

We identified two possible courses
 PRC_consolidated.pdfSRC_consolidated.pdfGouyPRC.pdfGouySRC.pdf 
  12414   Tue Aug 16 16:38:00 2016 gautamUpdateCOCRC folding mirrors - Numerical reviewHere are the results for case 2: (flat
PR3/SR3, for purpose of simulation, I've
used a concave mirror with RoC in the range
 PRC_consolidated.pdfSRC_consolidated.pdfGouyPRC.pdfGouySRC.pdf 
  12417   Wed Aug 17 14:37:36 2016 gautamUpdateCOCRC folding mirrors - Numerical review


 PRG.pdf 
  12418   Wed Aug 17 16:28:46 2016 KojiUpdateCOCRC folding mirrors - Numerical reviewFor 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 gautamUpdateCOCRC folding mirrors - updated specs
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li.li1
 Recycling_Mirrors_Specs_Nov2016.pdf 
  12847   Thu Feb 23 10:59:53 2017 gautamUpdateCOCRC folding mirrors - coating optimizationI've now made
 PR3_R_170222_2006.pdfPR3_123_TOnoise_170222_2203.pdfPR3_123_Layers_170222_2203.pdfPR3AR_R_170222_2258.pdfPR3AR_123_Layers_170222_2258.pdf 
  12887   Tue Mar 14 10:56:33 2017 gautamUpdateCOCRC folding mirrors - coating optimizationRana suggested including some additional
terms to the cost function to penalize high
sensitivity to deviations in the layer thickness
 PR3_R_170313_1701.pdfPR3AR_123_Layers_170313_1701.pdfPR3AR_R_170313_1752.pdfPR3AR_123_Layers_170313_1752.pdf 
  12936   Mon Apr 10 15:37:11 2017 gautamUpdateCOCRC 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 ranaUpdateCOCCavity Scan Simulation CodeHiro Yamamoto has updated SIS (Static Interferometer
Simulation) to allow us to do the MCMC based
inference of the 40m arm cavity mirror maps. 
 manyCavityScans-SIS.pdfmanyCavityScans-SIS.pdfMonteCarlo_CavityScans.mat 
  14148   Thu Aug 9 02:12:13 2018 gautamUpdateCOCSouth 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 gautamUpdateCOCMacroscopic SRC length for SR tuningSummary:

It
 SRC_MCMC_shortTerm.pdfSRC_dists_shortTerm.pdf 
  14314   Wed Nov 21 16:48:11 2018 gautamUpdateCOCEY mini cleanroom setupWith Chub's help, I've setup a
mini cleanroom at EY - Attachment
#1. The HEPA unit is running on
 IMG_7174.JPG 
  15374   Thu Jun 4 00:21:28 2020 KojiSummaryCOCITM spares and New PR3 mirrors transported to Downs for phasemap measurementGariLynn worked on the measurement of E1800089
mirrros.
  
  15401   Tue Jun 16 13:05:36 2020 KojiUpdateCOCITM spares and New PR3 mirrors transported to Downs for phasemap measurementITMU01 / ITMU02 as well as the five E1800089
mirrors came back to the 40m. Instead, the
two ETM spares (ETMU06 / ETMU08) were delivered
 40m_Optics.jpg 
  15625   Wed Oct 14 13:28:04 2020 KojiUpdateCOCITM/ETM spares in DownsThe two ITM spares and two ETM spares are
together stored in the optic storage (B110)
at Downs. c/o Liyuan and GariLynn
 IMG_3073.jpeg 
  3193   Mon Jul 12 11:20:56 2010 Gopal HowToCOMSOL TipsIntrusions (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 DmassHowToCOMSOL TipsIntrusions (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 GopalHowToCOMSOL TipsPictures from Transfer Function Tutorial on the WikiThe 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 GopalUpdateCOMSOL TipsIncluding Gravity in COMSOL[Gopal, Jan]
  
  3536   Tue Sep 7 20:44:54 2010 YoichiHowToCOMSOL TipsCOMSOL example for calculating mechanical transfer functionsI 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 AnnalisaHowToCOMSOL TipsMirror support Eigenfrequency I studied the eigenfrequencies of
a mirror support using COMSOL.
 
 IronSupport.pngIronSupportEigenfreq.png 
  8226   Mon Mar 4 20:03:42 2013 AnnalisaHowToCOMSOL TipsStudy of mirror mount eigenfrequencies I studied the eigenfrequencies of
a mirror mount designed with COMSOL.
I imposed fixed constraints for the
 MirrorSupport1.pngMirrorSupportEig1.pngpedestal.pngBase2.png 
  8437   Wed Apr 10 15:49:22 2013 AnnalisaConfigurationCOMSOL TipsYend 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
 Pics_end_table.pdf 
  15650   Thu Oct 29 09:50:12 2020 anchalSummaryCalibrationPreliminary calibration measurement takenI went to 40m yesterday at around 2:30
pm and Koji showed me how to acquire lock
in different arms and for different lasers.
 PreliminaryCalibrationData.pdf 
  16128   Mon May 10 10:57:54 2021 Anchal, PacoSummaryCalibrationUsing ALS beatnote for calibration, testTest details:


We
locked both arms and opened the shutter for
Yend green laser.
After toggling
 BeatY_ITMY_CalibrationAt57Hz.pdfBeatY_ITMY_CalibrationAt43Hz.pdfBeatY_ITMY_CalibrationAt77Hz.pdf 
  16315   Tue Sep 7 18:00:54 2021 TegaSummaryCalibrationSystem Identification via line injection[paco]

This morning, I spent some time
restoring the jupyter notebook server running
 raw_timeseries.pdfdemod_signals.pdfcal_noise_asd.pdf 
  16352   Tue Sep 21 11:13:01 2021 PacoSummaryCalibrationXARM calibration noiseHere are some plots from analyzing the
C1:LSC-XARM calibration. The experiment is
done with the XARM (POX) locked, a single
 XARM_signal_asd.pdfXARM_demod_timeseries.pdfXARM_demod_asds.pdfXARM_cal_0921_timeseries.pdf 
  16353   Wed Sep 22 11:43:04 2021 ranaSummaryCalibrationXARM calibration noiseI 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 PacoSummaryCalibrationXARM OLTF (calibration) at 55.511 Hz[anchal, paco]

Here is a demonstration of the
methods leading to the single (X)arm calibration
 OLTF_Calibration_Scheme.jpgXARM_POX_Lock_Model_TF.pdfXARM_OLTF_Total_Model.pdfXARM_OLTF_55p511_Hz_timeseries.pdfGmag_55p511_Hz_ASD.pdf 
  16369   Thu Sep 30 18:04:31 2021 PacoSummaryCalibrationXARM OLTF (calibration) with three lines[anchal, paco]

We repeated the same procedure
as before, but with 3 different lines at
 XARM_OLTF_Model_and_Meas.pdfGmag_ASD_nb_withTRX.pdf 
  16373   Mon Oct 4 15:50:31 2021 HangUpdateCalibrationFisher matrix estimation on XARM parameters[Anchal, Hang]

What: Anchal and I measured the
XARM OLTF last Thursday.
 tf_meas.pdffisher_est_vs_data.pdfPxx_evol.pdffisher_evol.pdf 
  16399   Wed Oct 13 15:36:38 2021 HangUpdateCalibrationXARM OLTFWe did a few quick XARM oltf measurements.
We excited C1:LSC-ETMX_EXC with a broadband
white noise upto 4 kHz. The timestamps for
 Screenshot_2021-10-13_15-32-16.png 
  16957   Tue Jun 28 17:07:47 2022 AnchalUpdateCalibrationAdded Beatnote channels in demodulation of c1calI 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 AnchalUpdateCalibrationError propagation to astrophysical parameters from detector calibration uncertaintyWe can calculate how much detector calibration
uncertainty affects the estimation of astrophysical
parameters using the following method:
 BNSparamsErrorwrtfdError-merged.pdfBBHparamsErrorwrtfdError-merged.pdfBNSparamsEPSwrtCalError.pdfBBHparamsEPSwrtCalError.pdf 
  17011   Mon Jul 18 15:17:51 2022 HangUpdateCalibrationError propagation to astrophysical parameters from detector calibration uncertainty1. In the error propogation equation, it
should be \Delta \Theta = -H^{-1} M \Delta
\Lambda, instead of the fractional error. 
  
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