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ID Date Author Type Category Subjectup Text Attachments
  10290   Tue Jul 29 20:14:08 2014 AndresUpdate40m Xend Table upgradeXarm Green steering mirror upgrade Xarm Green Steering Mirror Upgrade
Nick
and I did the upgrade for the green steering
mirror today. 
  
  10291   Tue Jul 29 20:14:10 2014 KojiUpdate40m Xend Table upgradeXarm Green steering mirror upgradeThat
was super fast! Great job, Andres and Nic!
  
  10422   Fri Aug 22 03:55:45 2014 JenneUpdateLSCXarm PDH fine, Yarm PDH/ALS needs work[Rana, Jenne, EricQ]
We did several things tonight. 
First, a list (so I can remember them all),
 Xend_ErrorPointMeasurements.pdfDARM_ALSdiff_vs_sqrtInv.pdf 
  10191   Sun Jul 13 17:06:35 2014 AndresUpdate40m Xend Table upgradeXarm Table Upgrade Calculation and Diagrams of possible new table layout Current Mode Matching
and Gouy Phase Between Steering Mirrors
 CurrentOpticalLayout.pngNewSetUp.PNGAlaModeSolutionplots.pngEntireScaleRangeAlaModeSolution.pngNewXarmOptimizationFromFaraday.m 
  8624   Thu May 23 01:27:11 2013 ManasaSummaryLSCXarm beat note search continuesTowards finding the x-arm beat note:

The green would not lock to a maximum
  
  8629   Thu May 23 13:14:34 2013 KojiSummaryLSCXarm beat note search continuesWe should consider to hook up the temperature
monitors of the NPROs to the ADCs.
  
  14424   Wed Jan 30 19:25:40 2019 gautamUpdateSUSXarm cavity alignmentSquishing cables at the ITMX satellite
box seems to have fixed the wandering ITM
that I observed yesterday - the sooner we
 Xarm.pngXarm_IR.png 
  1472   Fri Apr 10 19:10:53 2009 JenneUpdateGeneralXarm locked?I don't know who left the X arm locked,
but I just ran the Align Full IFO script,
so everything is good in case Yoichi/someone
  
  8203   Fri Mar 1 01:17:06 2013 JenneUpdateLSCXarm oscillationThere is an oscillation in the Xarm at
631Hz, which is not in the Yarm.  There
is a small peak in POY11_I at this frequency,
 POX11_630Hz_osc.pdf 
  8208   Fri Mar 1 16:58:37 2013 yutaUpdateLSCXarm oscillation stoppedPOX11 oscillation at 630 Hz was stopped
by installing 630 Hz resonant gain to LSC_XARM.
After few hours, oscillation stopped.
 POX11_630Hz.png 
  8210   Sat Mar 2 00:09:31 2013 ranaUpdateLSCXarm oscillation stopped  Don't use resonant gain - it
can lead to a loop instability since it makes
the loop have 3 UGFs.
  
  8297   Thu Mar 14 20:22:33 2013 JenneUpdateGreen LockingXbeat attemptI aligned the Xgreen and PSL green to overlap
on the X beat PD, and reconnected the splitter
which combines the X and Y beat signals and
  
  16194   Wed Jun 9 11:46:01 2021 Anchal, PacoSummaryAUXXend Green Laser PDH OLTF measurementWe measured the Xend green laser PDH Open
loop transfer function by following method:


We first measured the feedback
 image-6f2923a3-01ce-4d04-bc53-d8db0238e195.jpgimage-72223f4b-3b74-4574-a7ad-de6628a2c5e9.jpgX_Green_ARM_PDH_OLTF.pdf 
  16197   Thu Jun 10 14:01:36 2021 AnchalSummaryAUXXend Green Laser PDH OLTF measurement loop algebraAttachment 1 shows the closed loop of Xend
Green laser Arm PDH lock loop. Free running
laser noise gets injected at laser head after
 AUX_PDH_LOOP.pdf 
  16202   Tue Jun 15 15:26:43 2021 Anchal, PacoSummaryAUXXend Green Laser PDH OLTF measurement loop algebra, excitation at control pointAttachment 1 shows the case when excitation
is sent at control point i.e. the PZT output.
As before, free running laser noise 
 AuxPDHloop.pdf 
  16213   Fri Jun 18 10:07:23 2021 Anchal, PacoSummaryAUXXend Green Laser PDH OLTF with coherenceWe did the measurement of OLTF for Xend
green laser PDH loop with excitation added
at control point using a SR560 as shown in
 XEND_PDH_OLTF_with_Coherence.pdfBeta_Amp.pdf 
  8607   Tue May 21 18:18:23 2013 ManasaUpdateGreen LockingXend Green alignedX arm aligned to green.
Aligned the X arm to IR. 
Used steering mirrors to align the
  
  8610   Tue May 21 23:29:57 2013 ManasaUpdateGreen LockingXend Green alignedX-green and PSL green have been aligned
so that they interfere at the beat PD for
X. 
  
  16322   Mon Sep 13 15:14:36 2021 AnchalUpdateLSCXend Green laser injection mirrors M1 and M2 not responsiveI was showing some green laser locking
to Tega, I noticed that changing the PZT
sliders of M1/M2 angular position on Xend
  
  8569   Tue May 14 01:56:20 2013 JenneUpdateGreen LockingXend Green tweakedI locked the Xarm on green.  At the
PSL table, I adjusted the steering mirror
to get the beam centered on the GTRX DC PD. 
  
  8570   Tue May 14 02:19:13 2013 KojiUpdateGreen LockingXend Green tweakedNote that I'm supposed to return one of
the two green beat PDs and the power supply.
  
  9367   Tue Nov 12 16:49:22 2013 JenneUpdateLSCXend QPD and Whitening board pulled

    

       
            
 IMG_1262.JPGIMG_1260.JPGIMG_1264.JPGIMG_1276.JPG 
  9418   Wed Nov 20 17:05:15 2013 JenneUpdateLSCXend QPD and Whitening board replaced[EricQ, Jenne]
We have put the Xend QPD back in
place, and centered it.  The whitening
  
  9484   Wed Dec 18 00:26:15 2013 JenneUpdateLSCXend QPD schematic investigationI have looked at the photo of the Xend
QPD from elog
9367, as well as the schematic for the
  
  9486   Wed Dec 18 11:32:34 2013 ranaUpdateLSCXend QPD schematic investigation 
 Since we use the TransMon QPD
for triggering the high/low gain switching
  
  10794   Fri Dec 12 19:54:21 2014 JenneUpdateElectronicsXend QPD whitening board modifiedOkay, I have finished modifying the Xend
QPD whitening board, although I will likely
need to change the gain on Monday.
 QPDwhiteningModification_XtransCompleted_12Dec2014.pdfIMG_1779.JPGQPD_Xtrans_Ytrans_12Dec2014.pdfQPD_Xtrans_Ytrans_DarkVsLock_12Dec2014.pdf 
  10795   Sat Dec 13 00:35:11 2014 ranaUpdateElectronicsXend QPD whitening board modified 
 16 bit. There aren't any 14-bit
ADCs anywhere in LIGO. The aLIGO suspensions
  
  10774   Wed Dec 10 15:05:32 2014 JenneUpdateElectronicsXend QPD whitening board modified alreadyIn April, Koji logged that he had made
some changes to the Yend QPD whitening board
(elog
 IMG_1776.JPG 
  10782   Thu Dec 11 16:42:12 2014 JenneUpdateElectronicsXend QPD whitening board planHere is a little PDF of what I plan to
do to both of the transmission QPD whitening
boards later today.  The idea is to
 QPDwhiteningModification_11Dec2014.pdf 
  7180   Tue Aug 14 16:19:12 2012 JenneUpdateGreen LockingXend doubling crystal heater unplugged, repluggedI went down to the Xend table to look at
it to understand Steve's proposal, and I
noticed that the doubling crystal's heater's
  
  9025   Mon Aug 19 09:36:32 2013 KojiUpdateGreen LockingXend green aligned[Rana Koji]
This is an elog about the activity
on Friday night.
 ALS_OUTOFLOOP_130816.pdf 
  9031   Mon Aug 19 14:22:36 2013 ranaUpdateGreen LockingXend green aligned    
  9033   Mon Aug 19 16:18:56 2013 manasaUpdateGreen LockingXend green alignedASX scripts for PZT dither have been fixed
appropriately. Script resides in 
  
  9034   Mon Aug 19 17:40:32 2013 SteveUpdateGreen LockingXend green layout corrections Shutter moved, no more clipping.
Pick-off mirror 2" replaced
by 1" one. Laseroptik HR 532nm, incident
 beforeC.jpgnowC.jpgstillMultiple.jpg 
  9035   Mon Aug 19 19:08:35 2013 KojiUpdateGreen LockingXend green layout corrections- An Aluminum mirror instead of 2"
unknown mirror for the pick-off for the rejected
beam from the green faraday isolator (Steve)
  
  9039   Tue Aug 20 10:59:15 2013 SteveUpdateGreen LockingXend green layout corrections

    

       
            
 faraway.jpgcloser.jpg 
  9083   Wed Aug 28 11:15:02 2013 SteveUpdateGreen LockingXend green layout corrections

    

       
            
  
  16200   Mon Jun 14 18:57:49 2021 AnchalUpdateAUXXend is unbearably hot. Green laser is loosing lock in 10's of secondsWorking in Xend with mask on has become
unbearable. It is very hot there and I would
really like if we fix this issue.
 XAUX_PDH_Err_In_ASD.pdfXAUX_PZT_Out_Mon_ASD.pdf 
  6371   Wed Mar 7 11:44:29 2012 JenneUpdateGreen LockingXgreen beatnote cable made, laidThe Xgreen PD now has a cable going over
to the beatbox. Once beatbox characterization
is done I can re-find the beat, and we can
  
  6842   Thu Jun 21 01:58:29 2012 JenneUpdateGreen LockingXgreen preparations[Yuta, Koji, Jenne]
Lots
of small things happened tonight, in preparation
  
  7261   Thu Aug 23 21:53:06 2012 JenneUpdateGreen LockingXgreen still wouldn't lock[Jenne, Jamie]
We took a look at the Xend green,
and we weren't able to make it lock. 
  
  7266   Thu Aug 23 22:54:32 2012 JenneUpdateGreen LockingXgreen still wouldn't lock

    

       
            
 Xarm_Green_ErrorReflSignals_23Aug2012_LowRes.png 
  10638   Fri Oct 24 10:08:24 2014 manasaUpdateGeneralY AUX laser - fiber coupledThe Y end aux laser light
leaking after the doubling crystal has been
  
  10639   Fri Oct 24 18:53:23 2014 ranaUpdateGeneralY AUX laser - fiber coupled 10% seems like a pretty bad coupling
efficiency, even for a single lens. I know
that the NPRO itself isn't so elliptical
  
  10650   Wed Oct 29 11:45:11 2014 manasaUpdateGeneralY AUX laser - fiber coupled (52%)


   
        
            
 31.png 
  10640   Mon Oct 27 12:17:46 2014 manasaUpdateGeneralY AUX laser coupling telescope designSince I obtained a poor coupling efficiency
from the earlier setup, I went back to calculate
the coupling efficiency of the current setup.
 AUXmode.zipAUXmode.png 
  2186   Thu Nov 5 23:09:34 2009 AlbertoUpdateLSCY Arm Cavity Transfer FunctionAs for the X Arm, this the transfer function
I measured for the Y arm cavity.
 YarmTF01.png 
  2188   Fri Nov 6 00:24:06 2009 AlbertoUpdateLSCY Arm Cavity Transfer Function

    
        
 YarmTF02.png 
  9688   Mon Mar 3 23:16:06 2014 ranaUpdateLSCY Arm Loop Shape found to be weird: changed now I was getting the Y Arm ready for
Eric Q's loss measurements and so I looked
at the noise and loop shape. The loop shape
 Yarm_sweep_140303.pdfYarm_sweep_140303b.pdfyarm.pdf 
  8886   Mon Jul 22 03:09:51 2013 AnnalisaUpdateGreen LockingY Arm cavity scanYesterday and today I was in the lab doing
many cavity scan.
First I did many measurement with
 Screenshot-scan3_0722.pdf_-_Adobe_Reader.png 
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