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ID Date Author Type Category Subjectup Text Attachments
  11865   Tue Dec 8 23:24:08 2015 gautamUpdateGreen LockingY end laser (Lightwave) PZT calibrationSummary:

I
measured the PZT actuator gain for the Lightwave
 Ycalib_8Dec.pdf 
  11877   Sun Dec 13 21:55:28 2015 gautamUpdateGreen LockingY end laser (Lightwave) PZT calibrationSummary:

After
the discussions at the Wednesday meeting,
 IMG_5972.JPGServoY_TF_13Dec2015.pdfDatanCode.zipPSD_916Hz.pdf 
  11906   Mon Jan 4 16:09:54 2016 gautamUpdateGreen LockingY end laser (Lightwave) PZT calibrationSummary:

I
redid this measurement and have now determined
 choosingExcFreqs.pdflaserPZTcalib.pdf 
  5852   Wed Nov 9 16:49:17 2011 kiwamuUpdateGreen LockingY end laser temperature with slow input connectedIndeed it is strange. I took a quick look
at it.
In
  
  2791   Mon Apr 12 17:37:52 2010 josephbUpdateComputersY end simulated plant progressCurrently, the y end plant is yep.mdl. 
In order to compile it
 YEP.pngYEP_PLANT.png 
  2798   Tue Apr 13 12:49:35 2010 josephbUpdateComputersY end simulated plant progress

    
        
  
  14205   Fri Sep 21 09:59:09 2018 yukiConfigurationASCY end table upgrade plan[Yuki, Gautam]

Attachments #1 is the current setup
of AUX Y Green locking and it has
 Pic_CurrentSetup_AUXYgreen.jpegModeMatchingSolution_Current.pdfModeMatchingSolution_Current_Magnified.pdfModeMatchingSolution_Optimized.pdfModeMatchingSolution_Optimized_Magnified.pdf 
  14212   Sun Sep 23 19:32:23 2018 yukiConfigurationASCY end table upgrade plan[ Yuki, Gautam ]

The setup I designed before has
abrupt gouy phase shift between two steering
 Pic_NewSetup0923_AUXYgreen.jpegModeMatchingSolution_Result.pdfModeMatchingSolution_Magnified_0923.jpgpic0923_1.jpgpic0923_2.jpg 
  14214   Mon Sep 24 11:09:05 2018 yukiConfigurationASCY end table upgrade plan[ Yuki, Steve ]

With Steve's help, we checked
a new lens can be set soon after dichroic
 pic0924_1.jpg 
  14216   Tue Sep 25 18:08:50 2018 yukiConfigurationASCY end table upgrade plan[ Yuki, Gautam ]

We want to remotely control steeing
PZT mirrors so its driver is needed.
  
  14226   Wed Oct 3 14:24:40 2018 yukiConfigurationASCY end table upgrade planInterim Procedure Report:

Purpose

The current setup of AUX Y-arm
  
  14257   Mon Oct 15 20:11:56 2018 yukiConfigurationASCY end table upgrade planFinal Procedure Report for Green Locking
in YARM:

Purpose
  
  14260   Wed Oct 17 20:46:24 2018 yukiConfigurationASCY end table upgrade planTo do for Green Locking in YARM:

The auto-alignment servo should
be completed. This servo requires many parameters
  
  9844   Wed Apr 23 23:48:30 2014 manasaUpdateLSCY end whitening boardThe MON outputs of the Y end QPD whitening
board were hot earlier today while pulling
it out of the crate. After swapping
 IMG_1378.JPGIMG_1379.JPGIMG_1378.JPG 
  9849   Thu Apr 24 14:23:09 2014 not manasaUpdateLSCY end whitening board 
 maybe the tantalum caps on
the daughter board power supply lines are
  
  9852   Thu Apr 24 23:55:31 2014 KojiUpdateLSCY end whitening boardThe main problem was a panel fixing bolt
that caused the short circuits between power
 P4245550.JPG 
  10444   Wed Sep 3 04:17:21 2014 JenneUpdateLSCY green ALS (not PDH) needs investigationQ put the X PDH box back, so that I could
try locking, and remember which end is up
after a week away.
 Yarm_noisy_above_20Hz.pdf 
  6775   Thu Jun 7 01:46:05 2012 yutaSummaryGreen LockingY green beat - found it!!I found the big big Y green beat. Details
will be posted later.
 CIMG1504.JPG 
  6777   Thu Jun 7 02:59:31 2012 yutaUpdateGreen LockingY green beat - found it!!Summary:
  I found the big green beat
note for the Y arm. The alignment of the
  
  6746   Sat Jun 2 03:19:37 2012 yutaUpdateGreen LockingY green beat note found? - too smallSummary:
  I tried to find Y arm green
beat in order to do the mode scan.
 CIMG1437.JPG 
  11464   Thu Jul 30 10:38:18 2015 SteveUpdatePEMY sesimostation is back onKoji soldered new 50" long cable for
the Y station.

 
 Guralps_are_back_on.pngYstation.jpg 
  11466   Thu Jul 30 13:34:52 2015 KojiUpdatePEMY sesimostation is back onPlease check the spectra. If something
is wrong, please swap the cables between
X and Y in order to see if the cable is still
  
  11469   Thu Jul 30 15:24:54 2015 SteveUpdatePEMY sesimostation is back onAtm1,  New short-50" long cable
was installed at ETMY end ( Y-station ) between
Guralp-B ( MIT ) and granite base.
 NewShortCable-Y-B-Gur2.pnginterfaceInputSwapped.pngsameasAtm2.png 
  5066   Sat Jul 30 05:11:45 2011 SureshUpdateGreen LockingY- end table clean-upThe optics on the Y-end table which required
to be moved have been repositioned. 
 Y-end_table_work.png 
  4520   Wed Apr 13 16:56:08 2011 BryanConfigurationGreen LockingY-ARM Green-Locked! Locked!
The Y-arm can
  
  7187   Wed Aug 15 04:03:55 2012 ranaSummaryLSCY-Arm Locking0) Did a bunch of alignment to get beams
roughly centered on ETMY and ITMY and maximize
power. Adjusted the aperture and focus on
 yArmNoise_120815.pngyarm.pdf 
  5937   Fri Nov 18 00:36:23 2011 ZachUpdateGreen LockingY-Arm PDH box modifiedI modified the Y-Arm PDH box (S/N 17)  pdh17_tf_vs_liso_11_17_11.png 
  5956   Sat Nov 19 00:47:24 2011 ZachUpdateGreen LockingY-Arm locked with PDH Box #17I installed the newly modified PDH  error_sig_m_11_18_11.png 
  12188   Thu Jun 16 11:25:00 2016 JohannesUpdateLSCY-Arm round-trip loss measurement with ALSUsing the ALS green beat and armlength
feedback I mapped an IR resonance of the
Y-Arm by stepping through a ramp of offset
 T_vs_steps.pdff_vs_steps.pdf 
  4435   Wed Mar 23 19:16:17 2011 AidanSummaryGreen LockingY-END green equipment is all availableWith the exception of a 2" mirror
mount, I've confirmed that we have everything
for the Y-end green production and mode-matching.
 three-quarter_inch_pedestal.jpg 
  4436   Thu Mar 24 01:16:19 2011 SureshSummaryGreen LockingY-END green equipment is all availableThere was a 2" mirror mount among the spares
on the PSL table.  It has a window LW-3-2050
UV mounted in it.  I
  
  9232   Fri Oct 11 00:37:21 2013 MasayukiUpdateGreen LockingY-arm ALS [Manasa, Masayuki]
-
Motivation
 OLTF.pdfERR.pdf 
  9240   Tue Oct 15 01:39:07 2013 MasayukiUpdateGreen LockingY-arm ALS  
 - Motivation
 PDHinloop.pdfALSinloop.pdf 
  14738   Tue Jul 9 18:06:05 2019 gautamUpdateLSCY-arm ASS in a workable stateThe Y-arm ASS was tuned to be in a workable
state. Basically, I followed Koji's recipe.
 ditherFreqs.pdftransRenorm.png 
  9054   Thu Aug 22 20:25:28 2013 MasayukiSummaryGreen LockingY-arm PDH OLTF measurement[Manasa, Masayuki]
We measured the the openloop transfer
function of the PDH green lock of the y-arm.The
 OLTF_PDH_Glock_yarm_7.png 
  12884   Mon Mar 13 16:47:41 2017 SteveUpdatePEMY-arm air conditon belts replacedThe east end AC unit is arching over and
running rough at CES. Called for mechanic.......

Both belts were replaced and the
  
  13048   Wed Jun 7 14:11:49 2017 gautamUpdateASSY-arm coil driver electronics investigationRana suggested taking a look at the Y-arm
test mass actuator TFs (measured by driving
the coils one at a time, with only local
 CoilTFs.pdfY_OL_calib_check.png 
  13051   Wed Jun 7 17:45:11 2017 gautamUpdateASSY-arm coil driver electronics investigationI repeated the test of driving C1:SUS-<Optic>_<coil>_EXC
individually and measuring
 CoilTFs.pdf 
  13052   Thu Jun 8 02:11:28 2017 gautamUpdateASSY-arm coil driver electronics investigation
p.p1
{margin: 0.0px 0.0px 0.0px 0.0px; font: 18.0px
'Helvetica Neue'; -webkit-text-stroke: #000000}
p.p3
 AnalogCheck.pdfAnalogCheck_zoom.pdfArmCtrl.pdf 
  9164   Thu Sep 26 10:55:29 2013 SteveUpdateGeneralY-arm floor space for testLiyuon will set up a  ~5 mW He/Ne
laser for  waist measurement
  
  11879   Mon Dec 14 16:27:11 2015 gautamUpdateGreen LockingY-end AUX PDH noise breakdownSummary:

I've
attached the results from my measurements
 YAUX_NB_Dec2015.pdfPDH_errSig_Calib.pdf 
  11907   Mon Jan 4 16:45:11 2016 gautamUpdateGreen LockingY-end AUX PDH noise breakdownSummary:

I've
re-measured the noise breakdown for the Y-end
 ErrSigBreakdown.pdfcontrolSigBreakdown.pdfYEnd_PDH_OLTF.pdf 
  8817   Wed Jul 10 01:27:44 2013 gautamUpdateGreen LockingY-end Green PDH open-loop transfer function [Annalisa, gautam]
Summary:
We have measured the open-loop transfer
 Green_PDH_measurement.pdfY-end_Green_PDH.pdf 
  14943   Sat Oct 5 21:26:34 2019 gautamUpdateALSY-end green alignment tweakedSummary:

I improved the alignment of the
green beam into the Y arm cavity.
 ALSY_alignment.pngALSY_OOL.pdf 
  4994   Wed Jul 20 06:17:04 2011 SureshUpdateGreen LockingY-end green laser power issuesThe Y-end green beam power is 0.47 mW.
While
aligning the Y-end aux laser light into the
fiber we noticed that the green power out
 Y-end_table_powers.pdfY-end_table.png 
  14230   Thu Oct 4 22:15:30 2018 yukiConfigurationASCY-end table upgradeBefore changing setup at Y-end table, I
measured the status value of the former setup
as follows. These values will be compared
 AUXYGreenLock20180921.jpgPic_FormerSetup.jpegPic_CurrentSetup1004.jpg 
  14231   Fri Oct 5 00:46:17 2018 KojiConfigurationASCY-end table upgrade???

The SHG crystal has the conversion
efficiency of ~2%W (i.e. if you have 1W input
  
  14232   Fri Oct 5 17:32:38 2018 yukiConfigurationASCY-end table upgradeI measured it with the wrong setting of
a powermeter. The correct ones are here:


beam power going into doubling
  
  14233   Fri Oct 5 17:47:55 2018 gautamConfigurationASCY-end table upgradeWhat
about just copying the Xend
  
  14234   Fri Oct 5 22:49:22 2018 yukiConfigurationASCY-end table upgradeI designed a new layout. It has good mode-matching
efficiency, reasonable sensitivity to component
positions, good Gouy phase separation. I'm
  
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