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ID Date Authorup Type Category Subject Text Attachments
  15250   Wed Mar 4 16:54:43 2020 gautamUpdateCDSc1auxex temporarily disconnectedTo debug a problem with the new c1psl (later
elog), we needed a Supermicro EPICS server
that was using the shared EPICS/modbus/asyn
  
  15251   Wed Mar 4 20:42:53 2020 gautamUpdateElectronicsC1PSL acromag crate is sitting on the floorJon is going to write up the details of
todays adventures. But
the C1PSL Acromag chassis is sitting on the
  
  15254   Thu Mar 5 11:27:48 2020 gautamUpdateElectronicsC1PSL acromag crate is no longer sitting on the floor[jordan, gautam]

The C1PSL crate has now been installed
  
  15257   Thu Mar 5 19:51:14 2020 gautamUpdateElectronicsIMC Servo board being testedI am running some tests on the IMC servo
board with an extender card so
  
  15258   Fri Mar 6 01:12:10 2020 gautamUpdateElectronicsIMC Servo IN2 path looks just fineIt seems like the AO path gain
stages on the IMC Servo board work just fine.
The weird results I reported earlier
 AO_inputTFs_5Mar.pdfsliderCal_5Mar.pdf 
  15259   Fri Mar 6 01:19:19 2020 gautamUpdateIOOExcess laser frequency noiseSummary:

Sometime between 1PM and 6PM on
Tuesday, excess laser frequency noise
 MCF.pdfExcessFreqNoise.pdfALSnoise.pdf 
  15260   Fri Mar 6 16:33:11 2020 gautamUpdateIOOExcess laser frequency noiseI did some preliminary debugging of this,
and have localized the problem to the output
path (after MC slow) on the IMC Servo card.
  
  15261   Sat Mar 7 15:18:30 2020 gautamUpdateSUSEQ tripped some suspensionsAn earthquake around 330 UTC (=730pm yesterday
eve) tripped ITMX, ITMY and ETMX watchdogs.
ITMX got stuck. I released the stuck optic
 EQ_6Mar.png 
  15266   Wed Mar 11 18:12:53 2020 gautamSummaryPSLWFS Demod board modifications[koji, gautam]

 D980233-B_Mar2020Mods.pdf 
  15268   Thu Mar 12 01:33:21 2020 gautamUpdateLSCResuming locking activitiesIt's been a while since I've attempted
any locking, so tonight was mostly getting
the various subsystems back together.
 ExcessFreqNoise_LSC.pdf 
  15271   Thu Mar 12 12:44:34 2020 gautamUpdateGeneralPMC got unlcokedOf course the reboot wiped any logs we
could have used for clues as to what happened.
Next time it'll be good to preserve this
  
  15272   Thu Mar 12 16:13:16 2020 gautamUpdatePSLTemperature sensors connected to Acromag[jordan,
gautam]
 P_20200317_153736_vHDR_On_2.jpg 
  15273   Fri Mar 13 00:32:38 2020 gautamUpdateLSCSome progressFinally, some RF only CARM, see Attachment
#1. During this time,
 RFonly_CARM.pngCARMTF.pdf 
  15275   Fri Mar 13 14:28:39 2020 gautamUpdatePSLAdded tees to PMC Trans and REFLI want to monitor the PMC TRANS and
REFL levels on the PSL table - previously
there were some cables going to the oscilloscope
  
  15278   Tue Mar 17 01:22:03 2020 gautamUpdateLSCLocking updatesSummary:

No real progress tonight - I made
it a bunch of times to the point where CARM
  
  15279   Wed Mar 18 21:43:26 2020 gautamUpdateVACMain vol pressure jumpThere was a jump in the main volume pressure
at ~6pm PDT yesterday. The cause is unknown,
but the pressure doesn't seem to be coming
 VacPresJump.png 
  15281   Thu Mar 19 03:33:28 2020 gautamUpdateLSCMore locking updatesSome short notes, more details tomorrow.


I was able to make it to
CARM on RF only ~10 times tonight.
Highest
 PRFPMI_lock.pngCARMTF.pdfDARM_AvB.pdflockLoss.png 
  15282   Tue Mar 24 19:41:57 2020 gautamUpdateWienerSeismic feedforward for MCLSummary:

I think the feedforward filters
used for stabilizing MCL with vertex seismometers
 IMCseisFF.pdffilterComp.pdfoldFilter_v_proposed.pdfMCL_ff_performance.pdf 
  15283   Wed Mar 25 15:15:55 2020 gautamUpdateVACVacuum interlock code, N2 warning updateThe email address in the N2 checking script
wasn't right - I now updated it to email
the 40m list if the sum of reserve tank pressures
  
  15287   Tue Mar 31 09:39:41 2020 gautamUpdateCDSFoton for shaped noise injectionsI'd like to re-measure the transfer
function from driving MC2 position to the
MC_L_DQ channel (for feedforward purposes).
  
  15289   Tue Mar 31 23:54:57 2020 gautamUpdateCDSFoton for shaped noise injectionsThe problem is that foton does not inherit
the model sample rate when launched from
DTT/awggui. This is likely some shared/linked/dynamic
  
  15291   Thu Apr 2 15:53:01 2020 gautamUpdateASCPRMI 1f locked for collecting feedforward dataThis afternoon, I kept the PRM locked for
~1hour and then measured transfer functions
from the PRM angular actuators to the POP
  
  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 
  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 
  15308   Mon Apr 20 17:49:58 2020 gautamUpdateGeneralSome housekeeping

Empty
N2 replaced. 


Logged back into zita and started
 fDomainWF_Apr06.pdffDomainWF_Apr20.pdf 
  15309   Wed Apr 22 13:52:05 2020 gautamUpdateDetCharSummary page revivalCovid 19 motivated me to revive the summary
pages. With Alex Urban's help, the infrastructure
was modernized, the wiki
  
  15310   Wed Apr 22 17:29:14 2020 gautamUpdatePSLFSS debugging attemptsSummary:

On Monday, I hooked up an AG4395
to the PMC error point (using the active
 FSSspec.pdf 
  15315   Fri May 1 01:49:55 2020 gautamUpdateALSASY commissioningSummary:

It appears that the EY green steering
PZTs have somehow lost their bipolar actuation
  
  15316   Fri May 1 22:44:17 2020 gautamUpdateALSASY M2 PZT damagedI went to EY and saw that the HV power
supply was only putting out 50 V and had
hit the current limit of 10 mA (nominally,
  
  15318   Tue May 5 23:44:14 2020 gautamUpdateASCIMC WFSSummary:

I've been thinking about the
IMC WFS. I want to repeat the sort of analysis
 WFSmatrixComparison.pdfWFSheadNoise.pdf 
  15319   Wed May 6 00:31:09 2020 gautamUpdateALSOptomechanics during CARM offset reductionSummary:

The apparent increase in the ALS
noise (witnessed in-loop, e.g. 
 CARMplant.pdfCARMplant_force2disp.pdf 
  15321   Thu May 7 10:58:06 2020 gautamUpdateASCIMC WFSOK so the QPD segments are in the "+"
orientation when the 40m IMC WFS heads are
mounted at 45 deg. I thought "+"
  
  15324   Mon May 11 00:12:34 2020 gautamUpdateLSCRF only PRFPMIFinally - Attachment
#1. This plot uses
 PRFPMIlock.pdfIMG_8549.JPGIMG_8548.JPGDARM_OLTF.pdf 
  15326   Tue May 12 18:16:17 2020 gautamUpdateLSCRelative importance of losses in the arm and PRCAttachment
#1 is meant to show
 armLossVSPRCloss.pdf 
  15328   Tue May 12 22:47:49 2020 gautamUpdateLSCRelative importance of losses in the arm and PRCYes, \eta_A is the (average) round-trip
loss for an arm cavity. I'd estimate
this is ~100ppm currently. I edited the original
  
  15330   Thu May 14 00:21:03 2020 gautamUpdateLSCCM board boostsSummary:

I think the boosts that are currently
stuffed on the CM board are too
 boosts.pdfboosts_noise.pdf 
  15331   Thu May 14 00:47:55 2020 gautamSummaryComputer Scripts / Programspcdev1 added to authorized keys on nodusThis is to facilitate the summary page
config fines to be pulled from nodus in a
scripted way, without being asked for authentication.
  
  15335   Fri May 15 19:10:42 2020 gautamUpdateSUSAll watchdogs tripped, now restoredThis
EQ in Nevada seems to have tripped all watchdogs.
ITMX was stuck. It was released, and all
  
  15342   Thu May 21 15:31:26 2020 gautamUpdateComputer Scripts / ProgramsNDS2 service restartedThe service had failed at 16:09
yesterday. I just restarted it and am now
able to fetch data again. 
  
  15343   Fri May 22 01:43:18 2020 gautamUpdateElectronicsRF electronics troubleTo test a hypothesis, I have left the PSL
shutter closed. I notice significant glitches
in the dark electronics offsets on all the
 RFPDglitches.png 
  15347   Tue May 26 01:58:57 2020 gautamUpdateElectronicsSome electronics thoughtsA big factor in how much IFO locking activities
can take place is how cooperative the IMC
is.
 IMCsensingNoise.pdfIMCsensingNoise.pdf 
  15348   Tue May 26 02:15:36 2020 gautamUpdateLSCLock acquisition portal entrySummary:

Provided the IMC
is cooperative, the input pointing isn't
  
  15349   Tue May 26 02:31:00 2020 gautamUpdateLSCLock acquisition sequenceHere, I provide some details of the sequence.
Obviously, I am presenting one of the quickest
transitions to the fully locked state, I
 PRFPMIlock_1274418200_1274418550.pdf 
  15350   Tue May 26 02:37:19 2020 gautamUpdateLSCDARM loop measurement and fittingSummary:

In order to estimate the free-running
DARM displacement noise, I measured the DARM
 DARM_TF.pdfDARM_TF_breakdown.pdf 
  15351   Tue May 26 03:01:35 2020 gautamUpdateLSCCARM loop Summary:

I am able to realize ~8
kHz UGF with ~60 degrees
 CARM_OLTF.pdf 
  15352   Tue May 26 03:06:59 2020 gautamUpdateLSCPRFPMI sensing matrixSummary:

The response of the PRFPMI length
degrees of freedom as measured in the LSC
 PRFPMI_20200524sensMat.pdfPRFPMI_20200524sensMatHistograms.pdf 
  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 
  15355   Tue May 26 14:32:44 2020 gautamUpdateLSCArm transmission RINSummary:

The measured RIN of the arm cavity
transmission when the PRFPMI is locked is
 armRIN.pdf 
  15356   Tue May 26 16:00:06 2020 gautamUpdateLSCPower buildup diagnosticsSummary:

I looked at some DC signals for
the buildup of the carrier and sideband fields
 PRFPMIcorner_DC_1274419354_1274419654.pdfPRFPMIcorner_SB_1274419354_1274419654.pdf 
  15361   Thu May 28 18:36:45 2020 gautamUpdateLSCArm transmission RINI agree, I think the PRC excess angular
motion, PIT
in particular, is a dominant
 PRFPMIcorner_ASC_PIT_1274419354_1274419654.pdfPRFPMIcorner_ASC_YAW_1274419354_1274419654.pdfPRFPMIcorner_ASC_coherence_1274419354_1274419654.pdf 
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