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ID Date Author Type Categoryup Subject Text Attachments
  2361   Mon Dec 7 18:18:55 2009 JenneUpdateCOCETMX drag wiped[Koji, Jenne, Alberto, Steve, Bob]
ETMX has
  
  2366   Tue Dec 8 13:03:26 2009 KojiUpdateCOCETMY drag wipedJenne, Kiwamu, Alberto, Steve,   
  2367   Tue Dec 8 16:27:13 2009 JenneUpdateCOCITMX wipedJenne, Kiwamu, Koji, Alberto, Steve, Bob
ITMX
  
  2373   Wed Dec 9 18:01:06 2009 KojiUpdateCOCWiping finished[Kiwamu, Jenne, Alberto, Steve, Bob,
Koji]
We
  
  2424   Wed Dec 16 20:29:08 2009 ranaUpdateCOCETM Coating studyThis plot shows the Transmission for 532
and 1064 nm as a function of the thickness
of the SiO2 layer.
 layerfrac.png 
  2588   Wed Feb 10 23:44:56 2010 KojiSummaryCOCPhase Map AnalysisIn the middle of the last month, Kiwamu
and I went to Garilynn's lab to measure the
phase maps of the new ITMs and SRMs.
 SRM01_HR_RoC_rad_15mm.pngSRM01_HR_RoC_scan.png 
  2611   Wed Feb 17 19:36:05 2010 KojiUpdateCOCArm visibilityI
have measured the arm visibilities.
I did not see any change since the
  
  2614   Fri Feb 19 00:31:17 2010 JenneUpdateCOCNew ITMX guiderods glued[Jenne, Kiwamu, with moral support from
Koji, and loads of advice from Steve and
Bob]
  
  2618   Fri Feb 19 15:29:14 2010 kiwamuUpdateCOCGluing dumbbells and magnetsJenne and kiwamu
We have
  
  2623   Mon Feb 22 10:25:37 2010 JenneUpdateCOCITMY standoff and guiderod epoxiedThis work happened on Friday, after Nodus
and the elog went down....
[Jenne, Kiwamu]
  
  2629   Mon Feb 22 21:07:26 2010 JenneUpdateCOCMagnets glued to ITMX[Kiwamu, Jenne]
The magnets + dumbbell standoffs
have been glued to ITMX.  We're waiting
  
  2642   Fri Feb 26 01:00:07 2010 JenneUpdateCOCSuspension ProgressThis is going to be a laundry list of the
mile markers achieved so far:
* Guiderod and wire standoff glued
  
  2654   Thu Mar 4 02:25:14 2010 JenneUpdateCOCFurther details on the magnet story, and SRM guiderod glued[Koji, Jenne]
First, the easy story:  
  
  2820   Tue Apr 20 18:02:22 2010 JenneUpdateCOCNew SRM and PRM Hung[Jenne, Steve]
We removed the old SRM and PRM from
their cages, and are temporarily storing
  
  3051   Sun Jun 6 04:48:41 2010 ranaUpdateCOCITM01 HR Phase MapWhile trying to set up the SIS-FFT to use
our new ITM phase maps, I noticed that the
surface of our ITMs looks pretty good actually
 itm01hr.png 
  3091   Sun Jun 20 16:07:23 2010 KojiSummaryCOCCalibration of the metrology lab interferometerKiwamu and Koji
Summary
We have visited GariLynn's
 ring1_inner_centering.pdfring1_outer_centering.pdfSRMU01_pic.png 
  3684   Sun Oct 10 16:59:20 2010 KojiOmnistructureCOCPRM phase map measurement at Downs SB 014[Kiwamu, Yuta, Koji]
We went to the new metrology lab
at Downs subbasement (Rm014) in order to
 IMG_3646.jpgIMG_3647.jpg 
  3685   Sun Oct 10 18:09:02 2010 KojiSummaryCOCPhase map interferometer calibration for the data on Oct 8th, 2010 Summary:
Calibration
of the phase map interferometer was calculated
for the data on Oct 8th, 2010.
 calibration.pdf 
  3738   Mon Oct 18 18:33:46 2010 KojiSummaryCOCSummary of the main mirrors & their phasemap measurementI have made a summary web page for the
40m upgrade optics.
https://nodus.ligo.caltech.edu:30889/40m_phasemap/
  
  7385   Fri Sep 14 01:18:51 2012 ranaUpdateCOC2 Layout ChangesAfter looking
at the in-vacuum layout I think we should
  
  7398   Mon Sep 17 18:04:01 2012 SteveUpdateCOC2 Layout Changes

    

       
            
 IMG_1635.JPG 
  7517   Wed Oct 10 08:36:47 2012 SteveUpdateCOCspecial mirror mounts holder

    

       
            
 10101201.PDF 
  8211   Sat Mar 2 00:23:19 2013 ranaSummaryCOCPhase Maps measured of the ATF flat mirrorsI took the two 'flat' 2" mirrors over
to Downs and Garilynn showed me how to measure
them with the old Wyko machine.
 0966_0997_phasemap.pdf 
  10414   Wed Aug 20 15:31:27 2014 ericqUpdateCOCArm Loss Investigations Continue [ericq, Gabriele] 
Summary: After today's meeting, Gabriele
and I looked into the arm loss situation,
  
  11876   Fri Dec 11 23:12:09 2015 KojiSummaryCOCLoss map measurement documentYutaro left detailed slides for his loss
map measurement

https://dcc.ligo.org/LIGO-G1501547
  
  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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0.0px 0.0px 0.0px 0.0px; font: 12.0px 'Helvetica
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 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
  
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