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ID Date Author Type Category Subjectup Text Attachments
  6545   Wed Apr 18 11:54:31 2012 JenneUpdateGeneralPower outage last night

    

       
            
  
  11864   Tue Dec 8 15:57:16 2015 yutaroSummaryLSCPower recycling gain estimation from arm loss measurementI estimated power recycling gain with the
results of arm loss measurement.

From elog
  
  11872   Fri Dec 11 09:35:44 2015 yutaroUpdateLSCPower recycling gain estimation from arm loss measurementI took PR3 AR reflectivity and calculated
PRG (PR3 is flipped and so AR surface is
inside PRC).
 LaserOptikAR.png 
  11873   Fri Dec 11 13:28:36 2015 KojiUpdateLSCPower recycling gain estimation from arm loss measurementCan I ask you to make a plot of the power
recycling gain as a function of the average
arm loss, indicating the current loss value?
  
  11874   Fri Dec 11 15:37:50 2015 yutaroUpdateLSCPower recycling gain estimation from arm loss measurementAttached is the plot of relation between
the average arm round trip loss and
power recycling gain. 2 % loss due to PR3
 PRG_plot.png 
  7297   Tue Aug 28 17:16:54 2012 ericqUpdatePSLPower reduced!We have now reduced the power being
input to the MC from 1.25W to 10mW, and changed
out the MC refl BS for a mirror. 
  
  7298   Tue Aug 28 17:43:04 2012 JenneUpdatePSLPower reduced!

    

       
            
  
  7308   Wed Aug 29 17:02:41 2012 ericqUpdatePSLPower reduced!

    

       
            
  
  7310   Wed Aug 29 17:35:34 2012 KojiUpdatePSLPower reduced!The biggest reason why we could not lock
the MC was that the beam was not properly hitting
  
  4838   Mon Jun 20 10:45:43 2011 JamieUpdateCDSPower restored to 1X1/1X2 racks. IOO binary output module installed.All power has been restored to the 1X1
and 1X2 racks.  The modecleaner is locked
again.
  
  5148   Tue Aug 9 02:27:54 2011 Ishwita , ManuelUpdatePEMPower spectra and Coherence of Guralps and STS2We did offline wiener filtering on 3rd
August (Elog
entry) using only Guralps' channels X
 Coher_gur1_gur2_BW0.01.pngCoher_gur1_sts1_BW0.01.pngCoher_sts1_gur2_BW0.01.pngPw_gurs_correct.pngPw_gur1_sts1_correct.png 
  5197   Thu Aug 11 16:21:16 2011 Ishwita , ManuelUpdatePEMPower spectra and Coherence of Guralps and STS2 
 Following is the power spectrum
plot (with
 Pw_gur1_sts1_correct.png 
  5514   Thu Sep 22 10:43:50 2011 PaulUpdateSUSPower spectrum with different filter gains I thought it might be informative
before trying to optimise the filter design
to see how the current one performs with
 ITMY_YAW_closed_vs_open_noise.pdf 
  14481   Sun Mar 17 13:35:39 2019 AnjaliUpdateALSPower splitter characterizationWe characterized the power splitter ( Minicircuit-
ZAPD-2-252-S+). The schematic of the measurement
setup is shown in attachment #1. The network/spectrum/impedance
 Measurement_setup.pdfTotal_loss.pdfAmplitude_unbalance.pdfPhase_unbalance.pdf 
  5658   Wed Oct 12 19:58:32 2011 KatrinUpdateGreen LockingPower splitter is unbalancedThe mini circuit power splitter ZFRSC-42S+
used at the YARM has no balanced output as
it should have according to the data sheet.
  
  16417   Wed Oct 20 11:48:27 2021 AnchalSummaryCDSPower supple configured correctly.This was horrible! That's my bad, I
should have checked the configuration before
assuming that it is right.
  
  7600   Tue Oct 23 17:41:20 2012 ManasaUpdateAlignmentPower supply at OMC removed

    

       
            
  
  7603   Tue Oct 23 18:21:21 2012 JenneUpdateAlignmentPower supply at OMC removed

    

       
            
  
  1480   Tue Apr 14 02:59:02 2009 YoichiUpdateLockingPower up until 26Yoichi, Peter,

With careful adjustments of the common mode
  
  12539   Fri Oct 7 20:25:14 2016 KojiUpdateCDSPower-cycled c1psl and c1iool0Found the MC autolocker kept failing, It
turned out that c1iool0 and c1psl went bad
and did not accept the epics commands.
  
  12542   Mon Oct 10 11:48:05 2016 gautamUpdateCDSPower-cycled c1susaux, realigned PMC, spots centered on WFS1 and WFS2[Koji, Gautam]

We did the following today morning:


I re-aligned the PMC -
  
  7381   Thu Sep 13 23:27:14 2012 JenneUpdateGeneralPre-close checklistWe need
to do the following things:  Images
of optics in DRMI chain, place black glass
  
  12556   Thu Oct 13 00:23:54 2016 ericqUpdateVACPre-vent prepI have completed the following non-Steve
portions of the pre-vent checklist [wiki-40m.ligo.caltech.edu]


Center all oplevs, transom
  
  5868   Fri Nov 11 00:18:53 2011 ZachUpdateElectronicsPrecision temperature controllerI have made   
  9692   Wed Mar 5 16:27:51 2014 ericqUpdateLSCPreliminary Arm Loss MeasurementsI measured the arm cavity losses as Kiwamu
did way back in ELOG
5074.
 Yarm.pdf 
  14652   Tue Jun 4 00:17:15 2019 gautamUpdateBHDPreliminary BHD calculations​Summary:

Attachment
 LOreqs.pdf 
  14658   Thu Jun 6 18:49:22 2019 gautamUpdateBHDPreliminary BHD calculationsSummary:

I did some more calculations based
on our discussions at the meeting yesterday.
 darkPortScatter.pdfOMCbackscatter.pdfdirectScatter.pdf 
  14833   Tue Aug 6 15:52:06 2019 gautamUpdateBHDPreliminary BHD calculationsSummary:

The requirement on the phase noise
on the direct backscatter
 OMCbackscatter.pdf 
  8884   Fri Jul 19 23:35:31 2013 gautamConfigurationendtable upgradePreliminary Calibration of PZT I recalibrated
the QPD today as I had shifted its position
a little. I then identified the linear range
 QPD-XCalib.pdfQPD-YCalib.pdfPiezo_Yaw_Calib-in_QPD_linear_range-Pitch_tilt.pdfPiezo_Yaw_Calib-in_QPD_linear_range-Yaw_tilt.pdf 
  12621   Wed Nov 16 17:07:12 2016 AshleyUpdateGeneralPreliminary Microphone DataI am currently looking at the acoustic
noise around both arms to see if there are
any frequencies from machinery around the
 first_PSD_12kHz.pdfIMG_0171.JPG 
  12738   Thu Jan 19 10:21:54 2017 AshleyUpdateGeneralPreliminary Microphone DataBrief Summary:
I am currently looking at the acoustic
noise around both arms to see if there are
 xend_psd.pngxblrms.pngIMG_3734.JPG 
  12826   Mon Feb 13 17:39:45 2017 AshleyUpdateGeneralPreliminary Microphone Data Update
Problems that have occurred since
my last post: All of the sudden, I was getting
very strange data that was very quiet and
 figure_1.pngx_and_y_blrms_03.pngxblrms_median.png 
  11186   Tue Mar 31 22:27:43 2015 JenneUpdateModern ControlPreliminary PRMI angular Wiener resultsBefore locking for the evening, I wanted
to try again implementing the Wiener
filters that I had designed back
 PRMI_31Mar2015.pdf 
  11202   Sat Apr 4 17:54:03 2015 ranaUpdateModern ControlPreliminary PRMI angular Wiener resultsThis
is a very cool result. I'm surprised
  
  8947   Wed Jul 31 17:02:17 2013 Alex ColeUpdateElectronicsPreliminary Photodetector Frequency Reponse Measurements[Eric, Alex]
We used our setup from yesterday
(elog #8940) to measure transimpedance measurements
 REFL11.jpgREFL33.jpgREFL55.jpgAS55.jpg 
  8955   Thu Aug 1 18:55:20 2013 Alex ColeUpdateElectronicsPreliminary Photodetector Frequency Reponse Measurements

    

       
            
 POX11.jpgPOX11fit.jpg 
  3298   Tue Jul 27 12:02:31 2010 GopalUpdateOptic StacksPreliminary Transfer Function Measurements on MC1/MC3I have successfully
completed a preliminary transfer function
 MC1_MC3_FDA_1.pngMC1_MC3_FDA_2.pngMC1_MC3_FDA_3.pngMC1_MC3_FDA_4.pngMC1_MC3_FDA_5.png 
  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 
  5647   Tue Oct 11 00:59:55 2011 SureshUpdateIOOPreliminary locking of WFS loops[Kiwamu, Koji, Suresh]
After correcting several errors in
the WFS loops, we turned them on today and
 6x 
  15353   Tue May 26 03:26:58 2020 gautamUpdateLSCPreliminary noise budgetSummary:

This isn't meant to be a serious
budget, mainly it was to force myself to
 PRFPMI_NB.pdf 
  12240   Mon Jul 4 10:30:37 2016 ericqUpdateGeneralPreliminary vent plansHere are some plans / rough procedures
for this week's vent. It is unlikely
that I have though of everything, but this
  
  14415   Wed Jan 23 23:12:44 2019 gautamUpdateSUSPrep for FC cleaningIn preparation for the FC cleaning, I did
the following:


Set up mini-cleanroom at
 IY_level_before.pdf 
  2617   Fri Feb 19 13:28:44 2010 KojiUpdateGeneralPrep for Power Supply Stop - ETMX/ETMY oplev paths renewed. The nominal
gain for ETMY YAW was reversed as a steering
mirror has been put.
 screen_shot.png 
  2620   Sun Feb 21 17:44:35 2010 ranaUpdateGeneralPrep for Power Supply Stop [LIST]
[*] Turned on the RAID attached to linux1
(its our /cvs/cds disk)
  
  2621   Mon Feb 22 07:25:58 2010 ranaUpdateGeneralPrep for Power Supply Stop Autoburts have not been   
  2622   Mon Feb 22 09:45:34 2010 josephbUpdateGeneralPrep for Power Supply Stop

    
        
  
  2625   Mon Feb 22 11:42:48 2010 KojiUpdateGeneralPrep for Power Supply Stop Turned on the power supply for the oplev
lasers.
Turned on the power of the aux NPRO.
  
  14837   Fri Aug 9 08:59:04 2019 gautamUpdateCDSPrep for install of c1iscaux[chub, gautam]

We scoped out the 1Y3 rack this
morning to figure out what needs to be done
  
  16921   Wed Jun 15 17:12:39 2022 CiciSummaryGeneralPreparation for AUX Loop Characterization[Deeksha, Cici]

We went to the end Xarm station
and looked at the green laser setup and electronics.
  
  2958   Thu May 20 13:12:28 2010 josephbUpdateCDSPreparations for testing lsc,lsp, scy,spy togetherIn /cvs/cds/caltech/target/fb modified:
master: cleaned up so only io1 (IO
processor), LSC, LSP, SCY, SPY were listed,
  
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