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  40m Log, Page 228 of 341  Not logged in ELOG logo
ID Date Authorup Type Category Subject Text Attachments
  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 
  15364   Wed Jun 3 01:34:53 2020 gautamUpdateLSCLock acquisition update portalHighlights:


With better ASC servos
implemented, I think the lock stability has
  
  15365   Wed Jun 3 01:40:13 2020 gautamUpdateElectronicsMore electronics woesThere were many locklosses from the point
where the arm powers were somewhat stabilized.
 glitchySeis2.pngglitchySeis3.png 
  15366   Wed Jun 3 01:46:14 2020 gautamUpdateLSCCARM loop Summary:

The CARM loop now has a UGF of
~12 kHz with a phase
 CM_loop_topology.pdfCARM_TFs.pdfCARM_OLTF.pdfCARM_xover.pdfCARM_OLG_evolution.pdf 
  15367   Wed Jun 3 02:08:00 2020 gautamUpdateLSCPower buildup diagnosticsAttachments
#1 and 
 PRFPMIcorner_DC_1275190251_1275190551.pdfPRFPMIcorner_SB_1275190251_1275190551.pdf 
  15368   Wed Jun 3 02:14:32 2020 gautamUpdateASCPRC ASC improves arm transmission RINSummary:

I implemented an ASC servo for
the PRC, with the POP QPD as a sensor, and
 PRC_ASCsignals.pdfarmRIN_PRC_ASC.pdfPRFPMIcorner_ASC_PIT_1275190251_1275190551.pdfPRFPMIcorner_ASC_YAW_1275190251_1275190551.pdfPRFPMIcorner_ASC_coherence_1275190251_1275190551.pdf 
  15370   Wed Jun 3 11:20:19 2020 gautamUpdateDetCharSummary pagesSummary:

The 40m
summary pages have been revived. I've
  
  15371   Wed Jun 3 11:40:56 2020 gautamUpdateLSCLock acquisition update portalFor these initial attempts, I was just
trying to transition MICH to REFL55Q. I agree,
the PRCL situation may be more complicated.
  
  15372   Wed Jun 3 18:49:47 2020 gautamUpdateLSCPRG and CARM signal signSummary:

I am inclined to believe that the
arm cavity losses are such that the 
 armCavReflectivities.pdfIFOreflectivities.pdfPDHerrSigs.pdfPRGvsLoss_finesse.pdf 
  15373   Wed Jun 3 19:19:11 2020 gautamUpdateSUSAll watchdogs trippedThis
EQ seems to have knocked all suspensions
out. ITMX was stuck. It is now released,
  
  15376   Thu Jun 4 20:54:40 2020 gautamUpdateSUSMC1 Slow Bias issuesSummary:

I found that there is an issue with
the MC1 slow bias voltages. 
  
  15383   Mon Jun 8 18:14:55 2020 gautamUpdateCDSVertex FEs crashedSummary:

Around 5pm local time, the three
vertex FEs crashed. AFAIK, 
 FEcrash_CDSoverview.png 
  15391   Thu Jun 11 11:48:43 2020 gautamUpdateVACVac failureThere appears to have been some sort of
vacuum failure.
 vacFailure.png 
  15392   Thu Jun 11 16:14:03 2020 gautamUpdateVACVac failure - probable cause is serial comm glitchSummary:

It looks like the main vacuum interlock
was tripped due to a serial communication
 TP2_tempGlitch.pngPSL_shutterClosed.pngTP2tempGlitches.pdf 
  15393   Thu Jun 11 17:35:34 2020 gautamUpdateVACPumpspool UPS needs battery replacementSummary:

The pumpspool UPS has its "
  
  15397   Fri Jun 12 19:02:52 2020 gautamUpdateVACPumpspool UPS needs battery replacementI still don't understand why restoring
the vacuum is contingent on this functionality
working. All the TPs have their own internal
  
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