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ID Date Author Typeup Category Subject Text Attachments
  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 
  15354   Tue May 26 10:04:54 2020 JordanUpdateGeneralN2 ReplacementReplaced empty N2 tank, left tank at ~2000
psi, right tank ~2600 psi.
  
  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 
  15357   Tue May 26 19:19:30 2020 HangUpdateBHDBHD MM-- effects of astigmatismPlease see the attached doc. 

I think the conclusion is that
if the AS1 RoC error is not significantly
 MM.pdf 
  15358   Wed May 27 17:41:57 2020 KojiUpdateLSCPower buildup diagnosticsThis is very interesting. Do you have the
ASDC vs PRG (~ TRXor TRY) plot? That gives
you insight on what is the cause of the low
  
  15359   Wed May 27 19:36:33 2020 KojiUpdateLSCArm transmission RINMy speculation for the worse RIN is:

- Unoptimized alignment -> Larger
linear coupling of the RIN with the misalignment
  
  15360   Wed May 27 20:14:51 2020 KojiUpdateLSCLock acquisition sequenceI see. At the 40m, we have the direct transition
from ALS to RF. But it's hard to compare
them as the storage time is very different.
  
  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 
  15362   Fri May 29 00:34:57 2020 ranaUpdateLSCArm transmission RINhow bout corner plot with power signals
and oplevs? I think that would show not just
linear couplings (like your coherence), but
  
  15363   Tue Jun 2 14:05:24 2020 HangUpdateBHDMM telescope actuation range requirmentsWe computed the required actuation range
for the telescope design in elog:15357. The result
 TM_OL_spec_1274418500_512.pdfCORNER_OL_spec_1274418500_512.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 
  15369   Wed Jun 3 03:29:26 2020 KojiUpdateLSCLock acquisition update portalWoo
hoo!

Which 1f signals are
you going to use? PRCL has sign flipping
  
  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,
  
  15375   Thu Jun 4 08:45:41 2020 JordanUpdateGeneralPresence at 40mI will be at the 40m, in the Clean and
bake lab today from ~9am to ~3pm.
  
  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. 
  
  15377   Thu Jun 4 21:32:00 2020 KojiUpdateSUSMC1 Slow Bias issuesWe can limit the EPICS values giving some
parameters to the channels. cf https://epics.anl.gov/tech-talk/2012/msg00147.php

But this does not solve the MC1
  
  15378   Fri Jun 5 08:44:50 2020 JordanUpdateGeneralPresence at 40mI will be at the 40m,
in the Clean and bake lab today from ~9am
to ~3pm.
  
  15379   Sat Jun 6 14:07:30 2020 JonUpdateBHDStock-Part Mode-Matching Telescope OptionSummary

For the initial phase of
BHD testing, we recently discussed whether
the mode-matching telescopes could be built
 ASpathStock.pdfLOpathStock.pdf 
  15380   Mon Jun 8 11:50:02 2020 HangUpdateBHDAstigmatism and scattering plotsWe consider the astigmatism effects of
the stock options. The conclusions are:

1. For the AS path, the stock should work
 6x 
  15381   Mon Jun 8 12:49:07 2020 KojiUpdateBHDAstigmatism and scattering plotsCan you describe the mode matching 
in terms of the total MM? Is MM_total = sqrt(MM_vert
* MM_horiz)?
  
  15382   Mon Jun 8 17:40:22 2020 JonUpdateBHDAstigmatism and scattering plotsMM_total = (MM_vert + MM_horiz) / 2. 

The large astigmatic MM loss in
the LO case is mainly due to the strong LO4
 LOpathStock2.pdf 
  15383   Mon Jun 8 18:14:55 2020 gautamUpdateCDSVertex FEs crashedSummary:

Around 5pm local time, the three
vertex FEs crashed. AFAIK, 
 FEcrash_CDSoverview.png 
  15384   Mon Jun 8 21:45:47 2020 JonUpdateBHDAstigmatism and scattering plotsHmm? T1300364
suggests MM_total = Sqrt(MM_Vert * MM_Horiz)
  
  15385   Tue Jun 9 09:35:02 2020 JordanUpdateGeneralPresence at 40mI will be in the Clean and Bake lab today
from 9:30am to 4pm.
  
  15386   Tue Jun 9 14:55:43 2020 JonUpdateBHDMM telescope actuation range requirmentsI don't think we ever discussed why
the angular RMS of the ETMs is so much higher
than the ITMs. Maybe that's a separate
  
  15387   Tue Jun 9 15:02:56 2020 eHangUpdateBHDAstigmatism and scattering plotsUsing the updated AOI's for the LO
path: (4.8, 47.9, 2.9, 4.5) deg for (LO1,
LO2, LO3, LO4), we obtain the following results. 
 LO_MM_t_scat_stock.pdfLO_MM_s_scat_stock.pdfLO_MM_adj_stock.pdf 
  15388   Wed Jun 10 14:00:33 2020 JordanUpdateGeneralPresence at 40mI will be in the Clean and Bake lab from
10am to 4pm today. I will also replace an
empty N2 cylinder.
  
  15389   Thu Jun 11 09:37:38 2020 JonUpdateBHDConclusions on Mode-Matching TelescopesAfter further astigmatism/tolerance analysis
[ELOG
15380, 15387]
  
  15390   Thu Jun 11 11:14:12 2020 JordanUpdateGeneralPresence at 40mI will be in the Clean and Bake lab today
from 11am to 4pm.
  
  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 "
  
  15394   Fri Jun 12 01:23:32 2020 KojiUpdateVACPumpspool UPS needs battery replacement1. I agree that it's likely that it
was the temp signal glitch.
Recom #2: I approve to reopen the
  
  15395   Fri Jun 12 11:40:14 2020 JordanUpdateGeneralPresence at 40mI will be in the Clean and Bake lab today
from 12pm to 4pm.
  
  15396   Fri Jun 12 17:32:40 2020 KojiUpdateVACPumpspool UPS needs battery replacementJon and Koji remotely supported Jordan's
resetting the TP2 controller.

Here
 Screen_Shot_2020-06-12_at_17.22.23.png 
  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
  
  15398   Fri Jun 12 19:23:56 2020 KojiUpdateVACPumpspool UPS needs battery replacementThe vacuum safety policy and design are
not clear to me, and I don't know what
the first and second defense is. Since we
  
  15399   Fri Jun 12 19:33:31 2020 gautamUpdateVACPumpspool UPS needs battery replacementDidn't mean to sound whiny. I will
wait until the vacuum team tells me it is
okay.
  
  15400   Tue Jun 16 08:58:11 2020 JordanUpdateGeneralPresence at 40mI will be at the 40m today at 10am to deliver
optics to Downs and to replace the TP2 controller.
  
  15401   Tue Jun 16 13:05:36 2020 KojiUpdateCOCITM spares and New PR3 mirrors transported to Downs for phasemap measurementITMU01 / ITMU02 as well as the five E1800089
mirrors came back to the 40m. Instead, the
two ETM spares (ETMU06 / ETMU08) were delivered
 40m_Optics.jpg 
  15402   Tue Jun 16 13:35:03 2020 JonUpdateVACTemporary vac fix / IFO usable again[Jon, Jordan, Koji]

Today Jordan reconfigured the vac
system to allow pumping of the main volume
 Pumpdown.png 
ELOG V3.1.3-