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IDup Date Author Type Category Subject Text Attachments
  15125   Wed Jan 15 14:10:28 2020 JonConfigurationPSLNew EPICS database for C1PSL + C1IOOSummary

I have completed the
new EPICS channel database for the c1psl
and c1ioo channels
  
  15126   Wed Jan 15 15:04:31 2020 gautamUpdatePSLPMC Linewidth measurementFor the ringdowns, I suggest you replicate
the setup
I had - infrastructurally, this was quite
  
  15127   Wed Jan 15 16:08:40 2020 not gautamUpdatePSLAssembly underway for c1psl upgradeYou're right. We had the right
idea before but we got confused about this
issue. I changed all the XT1121s to XT1111
  
  15128   Wed Jan 15 16:54:51 2020 gautamUpdateGeneralPDA10CF removed from AS tablePer Yehonathan's request, I removed
one PDA10CF from a pickoff of REFL on the
AS table (it was being used for the mode
  
  15129   Thu Jan 16 19:32:23 2020 shrutiUpdateGeneralPLL / PM measurement of Xend NPRO PZTWith Gautam's help today the PLL managed
to be be locked for a few brief moments.
Turns out the signal power of the beat was
  
  15130   Fri Jan 17 18:02:21 2020 gautamUpdateALSGain blocks packaged and characterizedSummary:


The ZHL-1010+
gain blocks acquired from MiniCircuits
 photos.pdfgain.pdfnoise.pdfmeasSchem.pdfzhl1010Data.zip 
  15131   Fri Jan 17 21:56:22 2020 YehonathanUpdatePSLAOM first order beam alignmentToday I noticed that the beam reflected
from the PMC into the RFPD has a ghost (attachment)
due to reflection from the back of the high
 20200117_174841.jpg 
  15132   Fri Jan 17 22:11:19 2020 YehonathanUpdatePSLRingdown measurementsI prepare for the ringdown measurement
of the PMC according to Gautam's previous
experiments.
 20200117_192455.jpg20200117_192448.jpg 
  15133   Mon Jan 20 12:16:50 2020 gautamUpdatePSLPMC input reverted to AOM zeroth order beamSummary:


The input beam to the PMC
cavity was changed back to the zeroth order
 IMG_8362.JPG 
  15134   Mon Jan 20 15:11:20 2020 gautamUpdatePSLPMCT photodiode grounding issueFor a few days, I've noticed that the
PSL overview StripTool panel shows PMC transmission
and FSS RMTEMP channels with variation that
 PMCT_anomaly.pdf 
  15135   Mon Jan 20 20:20:36 2020 gautamUpdatePSLPMC servo checkoutSummary:

The PDH discriminant of the PMC
servo was measured to be ~
 PMCsweep.pdfOLTFmeas.pdf 
  15138   Wed Jan 22 11:00:21 2020 gautamUpdatePSLPMC REFL ghost beamI looked into this a little more today.


The steering optic used
to route PMC REFL to the RFPD is in fact
  
  15139   Wed Jan 22 11:22:39 2020 gautamUpdatePSLPMC modulation depth measurementSummary:

I estimate the PMC servo modulation
depth to be approximately 
 modDepth.pdf 
  15140   Wed Jan 22 16:19:47 2020 JonUpdateVACTP3 controller errorsGautam and I debugged a communications
problem with TP3 that was causing its python
service to fail. We traced the problem back
  
  15141   Wed Jan 22 16:38:01 2020 ranaUpdateComputersrossa revivalwiped and install Debian 10 on rossa today

still to be done: config it as
CDS workstation
  
  15142   Wed Jan 22 19:17:20 2020 gautamConfigurationComputersMegatron: starts up gradeupgrade was done

cronjob testing wasn't one
by one 😢 
  
  15143   Wed Jan 22 20:12:36 2020 gautamUpdatePSLPMC demodulator electrical characterizationSummary:

The mixer
+ LPF
 demodChar.pdfmixerChar.pdf 
  15144   Thu Jan 23 14:37:05 2020 gautamUpdatePSLPMC VGA chip damaged?[jordan, gautam]

Summary:
 VGAchar.pdf 
  15145   Thu Jan 23 15:32:42 2020 gautamConfigurationComputersMegatron: starts up gradeThe burt snapshotting is still not so reliable
- for whatever reason, the number of snapshot
files that actually get written looks random.
  
  15146   Thu Jan 23 16:37:14 2020 ranaUpdatePSLPMC VGA chip damaged?doesn't seem so anomolous to me; we're
getting ~25 dB of gain range and the ideal
range would be 40 dB. My guess is that even
  
  15147   Thu Jan 23 18:52:31 2020 gautamUpdatePSLPMC RFPD characterizationSummary:

The RF transimpedance of the PMC
PDH RFPD was measured, and found to be 
 PDresp.pdf 
  15148   Thu Jan 23 20:08:49 2020 shrutiUpdateGeneralPLL / PM measurement of Xend NPRO PZTSetup Update:

-
No more SR 560, upgraded to LB1005
P-I controller.  Because:
 Image-1.jpg 
  15149   Thu Jan 23 22:10:01 2020 gautamUpdatePSLPMC servo pulled outWhile I have the board out, I'll try
and do a thorough investigation of TFs and
noise of the various stages. 
  
  15150   Thu Jan 23 23:07:04 2020 JonConfigurationPSLc1psl breakout board wiringTo facilitate wiring the c1psl chassis
and scripting loopback tests, I've
compiled a distilled spreadsheet with the
 c1psl_feedthrough_wiring.pdf 
  15151   Fri Jan 24 13:56:21 2020 JonUpdateBHDBHD optics specificationsI've started a spreadsheet for the
BHD optics specifications and populated it
with my best initial guesses. There are a
  
  15152   Fri Jan 24 15:42:08 2020 gautamUpdatePSLPMC servo restoredThe PMC servo was re-installed at ~345pm.
HV supplies were re-energized to their nominal
values. I will update the results of the
  
  15153   Fri Jan 24 17:14:01 2020 gautamUpdateALSGain blocks installedJordan will write up the detailed elog
but in summary,


Former +24V Sorensen in
  
  15154   Sat Jan 25 11:54:42 2020 YehonathanUpdatePSLRingdown measurementsZero
order beam PMC ringdown

On Wednesday I installed 3
 Input_beam_path.jpgReflected_Beam_Path.jpgTransmitted_Beam_Path.jpgPMCRingdownNormalizedRawdata.pdfTransPDFits.pdf 
  15155   Sun Jan 26 13:30:19 2020 gautamUpdateSUSAll watchdogs tripped, now restoredLooks like a M=4.6
earthquate in Barstow,CA tripped all
the suspensions. ITMX got stuck. I restored
 EQ_Jan25.pdf 
  15156   Sun Jan 26 13:47:00 2020 gautamUpdatePSLPMC servo characterizationSummary:


I investigated the stage-by-stage
transfer functions of the PMC servo up till
 elecTFs.pdfVGAchar_postFix.pdfVGAlinearity_postFix.pdfnewOLTFs.pdf 
  15157   Sun Jan 26 14:40:55 2020 gautamUpdateALSALS OOL noiseIn preparation for resuming IFO locking
activities, I measured the ALS noise with
the arm lengths locked to IR, AUX laser frequencies
 ALSnoise_20200126.pdf 
  15158   Mon Jan 27 14:01:01 2020 JordanConfigurationGeneralRepurposed Sorenson Power Supply The 24 V Sorenson (2nd from bottom) in
the small rack west of 1x2 was repurposed
to 12V 600 mA, and was run to a terminal
  
  15159   Mon Jan 27 18:16:30 2020 gautamConfigurationComputersSluggish megatron?I've also been noticing that the IMC
Autolocker scripts are running rather sluggishly
on Megatron recently. Some evidence - on
  
  15160   Mon Jan 27 21:35:06 2020 YehonathanUpdatePSLRingdown measurementsZeroth
order IMC ringdown setup

Following
 IMC_REFL_Beam_Path.jpg 
  15161   Mon Jan 27 21:48:49 2020 gautamUpdatePSLRingdown measurementsIt's fine to block the WFS while doing
ringdowns 
 elevatedSeis.pdf 
  15162   Tue Jan 28 08:26:53 2020 ranaFrogsPEMshakinghttps://breakthrough.caltech.edu/magazine/2019-aug/#article-Listening-with-Light

  
  15163   Tue Jan 28 14:33:24 2020 gautamUpdatePSLInferred free-running frequency noiseTo conclude my PMC noise investigations:
Attachment
 inLoopNoise_IMClocked.pdffreqNoiseComparison.pdf 
  15164   Tue Jan 28 15:39:04 2020 gautamConfigurationComputersSluggish megatron?There were a bunch of medm processes stalled
on megatron (connected with screenshot taking).
To see if they were interfering with the
  
  15165   Tue Jan 28 16:01:17 2020 gautamUpdateIOOIMC WFS servos stable againWith all of the shaking (man-made and divine),
it was a hard to debug this problem. Summary
of fixes:
 QPD_recenter.png 
  15167   Tue Jan 28 17:36:45 2020 gautamConfigurationComputersLocal EPICS7.0 installed on megatron[Jon, gautam]

We found that the caput
  
  15168   Tue Jan 28 19:12:30 2020 JonConfigurationPSLSpare channels added to c1psl chassisAfter some discussion with Gautam, I decided
to build more spare channels into the new
c1psl machine. This is anticipation of adding
 c1psl_feedthrough_wiring_v2.pdf 
  15169   Tue Jan 28 19:40:15 2020 shrutiUpdateGeneralPLL / PM measurement of Xend NPRO PZTOver the past few days, I have been trying
to make measurements of the phase modulation
transfer function by modulating the X end
 PMTF.pdfBeatSpectrum.pdf 
  15170   Tue Jan 28 20:51:37 2020 YehonathanUpdateIOOIMC WFS servos stable againI resume my IMC ringdown activities now
that the IMC is aligned again.

To avoid any accidental misalignments
  
  15171   Wed Jan 29 00:27:13 2020 gautamUpdateComputer Scripts / Programsmcup / mcdown modifiedTo fix the apparent slowness of execution
of the caput
  
  15172   Wed Jan 29 00:29:43 2020 gautamUpdateLSClocking 2020The goal tonight was to go through the
locking scripts to see if I could recover
the state from November 2019, when I could
 PRFPMI_2020Jan.png 
  15173   Wed Jan 29 03:05:47 2020 rana, gautamUpdateSUSMC misalignments / sat box gamesIn the last couple days, as the IMC ringdowns
have been going on, we have noticed that
the MC is behaving bad. Misaligning, drifting,
 IMG_8366.JPG 
  15174   Wed Jan 29 12:29:33 2020 shrutiUpdateGeneraldelay line frequency discriminator for PM Today I began working on a TF measurement
based on the delay line frequency discriminator
setup in elog
 20200128.pngIMG_BB01C068495A-1.jpeg 
  15175   Wed Jan 29 12:40:24 2020 YehonathanUpdateIOOIMC Ringdowns preliminary data analysisI analyze the IMC ringdown data from last
night. 

Attachment 1 shows the normalized
 IMCRingdownNormalizedRawdata.pdfIMCTransPDFits.pdf 
  15176   Thu Jan 30 12:52:10 2020 JonUpdateBHDMetal OMCs procuredLast night Yehonathan and I located the
two steel PMCs in the QIL, with help from
Anchal. They are currently sitting on my
  
  15177   Thu Jan 30 15:24:10 2020 ?UpdateGeneraldelay line frequency discriminator for PMyes, its fine to use this
with a level 3 or level 7 mixer; let's
  
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