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ID Date Author Type Category Subjectup Text Attachments
  10337   Wed Aug 6 10:45:56 2014 GabrieleUpdateASCPOP QPD signals In addition to the simulation described
in my
previous elog, I simulated the signal
 pop_qpd_2f.png 
  10338   Wed Aug 6 12:44:52 2014 KojiUpdateASCPOP QPD signalsThis is nice. Can we test this idea with
POP22 + a razor blade?
Just to take transfer functions in
  
  9883   Wed Apr 30 18:06:06 2014 jamieUpdateCDSPOP QPD signals now on dolphinThe POP QPD X/Y/SUM signals, which are
acquired in c1ioo, are now being broadcast
over dolphin.  c1ass was modified to
 c1ass-POPQPD.pngc1ioo-POPQPD.png 
  10398   Fri Aug 15 01:31:44 2014 JenneUpdateASCPOP QPD to ETMs model wiring completeI have added a few things to the ASS model,
and the ASC sub-block, so that we can send
POP QPD information down to the ETMs for
 ASC_newCARM.pngASSoverview_newCARM.pngASC_screen.png 
  15296   Fri Apr 3 17:15:53 2020 gautamUpdateASCPOP angular FF filters trained and testedSummary:
Using the data I collected yesterday,
the POP angular FF filters have been trained.
 FIRvIIR.pdfPRM_act_calib.pdfIIR_fit_to_FIR_PIT.pdfIIR_fit_to_FIR_YAW.pdfPOP_DC_comparison.pdf 
  15297   Mon Apr 6 12:26:07 2020 ranaUpdateASCPOP angular FF filters trained and testedthat's pretty great performance. maybe
you can also upload some code so that we
can do it later too - or maybe in the 40m
  
  15298   Mon Apr 6 16:46:40 2020 gautamUpdateASCPOP angular FF filters trained and testedI don't have a recent measurement of
the optical gain of this config so I can't
undo the loop, but in-loop performance doesn't
 PRCL_comparison.pdf 
  16832   Thu May 5 14:46:22 2022 AnchalUpdateBHDPOP beam height lowered, POP_SM4 raised[Anchal, JC]

We first aligned the single arm
cavity resonance for both arms to get maximum
  
  7752   Tue Nov 27 03:26:00 2012 JenneUpdateGeneralPOP beam on POP55, POP camera

    

       
            
  
  16831   Wed May 4 18:52:43 2022 TegaUpdateBHDPOP beam too high at POP SM4 on the ITMX chamber[Yuta, Tega]

We needed to sort out the POXDC
signal so we could work on X-arm alignment.
 snnp_pr2_pr3_itmy_aligment.png 
  17269   Tue Nov 15 17:58:00 2022 PacoConfigurationCamerasPOP camera realignment after IFO alignment[Paco, Yuta]

I swapped the 1 inch BS and lenses
along the POP beam to clear the apertures
 Screenshot_2022-11-15_16-22-26_AlignedBothArmLocked.pngPXL_20221115_215851553.jpgPXL_20221115_233429500.jpg 
  7968   Wed Jan 30 19:30:21 2013 JenneUpdateLockingPOP in-vac improved

    

       
            
 HalfPRCL_PRM-flatMirror_POPtrans_30Jan2013.jpg 
  7426   Fri Sep 21 20:48:24 2012 JenneUpdateGeneralPOP in-vac optics aligned, POY beam coming out of vacGetting POP:
We put a green laser pointer at ~4
inches on the POX table, and steered it using
  
  7436   Mon Sep 24 23:45:39 2012 ranaUpdateGeneralPOP in-vac optics aligned, POY beam coming out of vac  What was the reasoning / resolution
of the POP forward/backward beam? Are we
going to have the right beam for DRMI locking?
  
  7437   Tue Sep 25 14:29:07 2012 JenneUpdateGeneralPOP in-vac optics aligned, POY beam coming out of vac

    

       
            
  
  7554   Tue Oct 16 00:33:29 2012 JenneUpdateLSCPOP lens placed on POX table, 2 PRMI movies[Evan, Jenne]
We aligned the PRMI.  We definitely
can lock MICH, but we're not really sure
  
  7555   Tue Oct 16 02:34:38 2012 KojiUpdateLSCPOP lens placed on POX table, 2 PRMI moviesHow
can you lock the PRMI without the REFL beams?
  
  8519   Wed May 1 14:42:45 2013 JenneUpdateLSCPOP now has lens in front of PD

    

       
            
  
  15010   Mon Nov 4 16:06:58 2019 gautamUpdateLSCPOP optical pathI did some re-alignment of the POP beam
on the IX in air table. Here are the details:


 IMG_8027.JPGlensRealignment.jpgPOPrealigned.pngPOPdither.pngPRMfixed.png 
  8091   Fri Feb 15 20:07:28 2013 yutaUpdateAlignmentPOP path set up but AS55 is broken[Manasa, Yuta]

We set up POP camera and POPDC PD,
  
  8100   Mon Feb 18 21:43:05 2013 KojiUpdateAlignmentPOP path set up but AS55 is brokenI undertook the investigation of the AS55
PD.
I found the PD is not broken.
 AS55.pdf 
  8102   Tue Feb 19 00:21:09 2013 yutaUpdateElectronicsPOP path set up but AS55 is brokenHmm......  
I thought AS55 is broken because it
was not responding to the AS beam nor flashlight
  
  8104   Tue Feb 19 05:42:28 2013 KojiUpdateElectronicsPOP path set up but AS55 is broken10010 Ohm for POP55 vs 50 Ohm for AS55
(cf. http://nodus.ligo.caltech.edu:8080/40m/4763)
I
  
  8105   Tue Feb 19 08:06:02 2013 yutaUpdateElectronicsPOP path set up but AS55 is brokenI didn't use LED flash light. We learned
from the past (elog
#7355). I checked that POP55 and REFL55/165/33/11
  
  15009   Mon Nov 4 15:29:47 2019 gautamUpdateLSCPOP signal pathThere are many versions of the POP22 signal
path I found on the elog, e.g. this
thread. But what I saw at the LSC rack
 POPchain.pdf 
  13985   Tue Jun 19 00:19:00 2018 gautamUpdateASCPOP status checkMotivation:


I want to use the QPD at
POP, calibrate it into physical units, and
  
  10752   Thu Dec 4 00:26:07 2014 JenneUpdateASCPOP yaw razor blade installedWe would like the option of feeding
back the POP beam position fluctuations to
the PRM to help stabilize the PRC since we
 ASC_PRCLloop_POP22err.pdfPRC_YAW_QPDvs22_3Dec2014.pdf 
  10768   Tue Dec 9 03:34:52 2014 JenneUpdateASCPOP yaw razor tuningWith the re-do of the IFO alignment last
week, I think that the beam was no longer
about halfway on the POP22 razor blade. 
 PRC_YAW_QPDvs22_8Dec2014.pdf 
  7664   Fri Nov 2 19:59:54 2012 JenneUpdateAlignmentPOP, POX, POY, IPPOS, IPANG, REFL all coming out of vac[Evan, Jenne, Jamie]
We used the green laser pointer technique
to adjust the POP steering mirrors behind
  
  7667   Sat Nov 3 10:31:59 2012 ranaUpdateAlignmentPOP, POX, POY, IPPOS, IPANG, REFL all coming out of vac  That's good, but I request
two things:
1) Check that the REFL beam is coming
  
  8405   Wed Apr 3 18:22:00 2013 JenneUpdateElectronicsPOP110 re-implementedI have re-implemented POP110.  The
cable coming from the AS110 diode is disconnected,
labeled, and sitting in the cable tray next
  
  10622   Fri Oct 17 13:19:48 2014 JenneUpdateLSCPOP22 ?!?!We've seen this before, but we need to
figure out why POP22 decreases with decreased
CARM offset.  If it's just a demod phase
  
  8411   Thu Apr 4 10:12:55 2013 GabrieleSummaryLSCPOP22 and POP110I had a look at the POP110 signal, with
the PRMI flashing.
1) The LSCoffset script does not
 pop110_2.pdf 
  9487   Wed Dec 18 11:37:12 2013 JenneUpdateLSCPOP22 and POP110 demod phasesSomehow the POP22 and POP110 demod phases
weren't correct anymore.  I guess Den
saw this after he changed the setup for the
  
  8379   Mon Apr 1 09:05:09 2013 Jenne, GabrieleConfigurationLSCPOP22 configurationOn Friday we modified the POP22 set up:
now the PD output goes to a bias tee. The
DC output goes to the ADC board, while the
  
  15001   Wed Oct 30 17:08:40 2019 gautamUpdateLSCPOP22 investigationThe POP beam coming out of the vacuum chamber
is split by a 50/50 BS and half is diverted
to the POP22/POP110/POPDC photodiode (Thorlabs
 POP22anomaly.pdf 
  5788   Wed Nov 2 19:32:20 2011 kiwamuUpdateLSCPOP22/110 installed[Steve / Kiwamu]
 The
POP22/110 RFPD has been installed. It is
  
  6464   Thu Mar 29 11:29:27 2012 keikoUpdateLSCPOP22/POP110 amplifiresYesterday I and Kiwamu connected two amplifiers
(mini-circuit, ZFL-1000LNB+) for POP22/110.
Dataviewer can see some signals. I'll test
  
  6466   Thu Mar 29 18:42:11 2012 keikoUpdateLSCPOP22/POP110 amplifiresAdding two amplifiers on POP22/110,
I checked the signals going to the dmod board
of 22 and 110.
 P3290004.JPGP3290005.JPG 
  4783   Fri Jun 3 14:27:32 2011 KojiUpdateElectronicsPOP55 test resultsThe full characterization of POP55 is found
in the PDF.
Resonance at 54.49MHz
 POP55_test.pdf 
  15029   Fri Nov 15 12:08:04 2019 gautamUpdateLSCPOPDC whitening boardThe DC port of the Bias-Tee is routed to
(a modified
version of) the iLIGO whitening board.
  
  16817   Thu Apr 28 11:53:10 2022 AnchalSummaryBHDPOP_SM4 and POP_SM5 AssemblyPOP_SM4

I
tried out this stack today and found some
change of plans.
  
  1963   Tue Sep 1 13:52:06 2009 steveConfigurationGeneralPOX rfpd is back & needs alignment


   
        
            
  
  1961   Fri Aug 28 15:30:15 2009 steveConfigurationGeneralPOX rfpd removedI removed POX rfpd to see how it is mounted
on its base. It is here on the work bench
just in case someone wants to use it the
  
  1966   Thu Sep 3 23:41:32 2009 AlbertoConfigurationLSCPOX (PD3) alignedToday I aligned the beam to PD3 (POX) since
Steve had moved it.
The DC power read 1.3mV when the
  
  15049   Tue Nov 26 17:07:41 2019 gautamUpdateLSCPOX / POY calibrationSummary:

Since we are using the POX and
POY photodiodes as out-of-loop sensors for
 POX_POY_sensorNoise.pdfALSnoise_20191125.pdf 
  15050   Tue Nov 26 18:16:08 2019 ranaUpdateLSCPOX / POY calibration...maybe the opto-mechanical
CARM plant
  
  15123   Wed Jan 15 10:04:19 2020 gautamSummaryGeneralPOX / POY locking restoredSingle arm locking using POX and POY has
been restored. After running the dither alignment
servos, the TRX/TRY levels are ~0.7. This
 singleArms.png 
  16799   Thu Apr 21 18:18:42 2022 yehonathanUpdateBHDPOX Alignment{Yehonathan, Paco}

BS, ITMX and ETMX were aligned
to get flashing in the X arm.
 POX11_alignment.png 
  16824   Mon May 2 17:51:30 2022 AnchalUpdateBHDPOX Beam aligned on RFPD, YARM locked[Paco, Anchal]

We found that one of the Y1-1037-45P
marked mirror that we used was actually curved.
  
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