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IDup Date Author Type Category Subject Text Attachments
  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
  
  15329   Wed May 13 15:13:11 2020 YehonathanUpdateLoss Measurement40m Phase maps loss estimationKoji pointed out during the group meeting
that I should compensate for local tilt when
I move the beam around the mirror for calculating
 ITMX_Loss_Map.pdfETMX_Loss_Map.pdf 
  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.
  
  15332   Thu May 14 12:21:56 2020 YehonathanUpdateLoss Measurement40m Phase maps loss estimationI finished calculating the X Arm loss using
first-order perturbation theory. I will post
the details of the calculation later.
 ITMX_Loss_Map_Perturbation_Theory.pdfETMX_Loss_Map_Perturbation_Theory(1).pdf 
  15333   Thu May 14 19:00:43 2020 YehonathanUpdateLoss Measurement40m Phase maps loss estimationPerturbation theory:

The cavity modes 
  
  15334   Fri May 15 09:18:04 2020 JonUpdateBHDBHD telescope designs accounting for ASCHang and I have reanalyzed the BHD telescope
designs, with the goal of identifying
sufficiently non-degenerate locations for
 LOpath.pdfASpath.pdf 
  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
  
  15336   Mon May 18 18:00:16 2020 HangUpdateBHDBHD mode-matching study[Jon, Tega, Hang]

We proposed a few BHD mode-matching telescope
designs and then preformed a few monte-carlo
 MM.pdf 
  15337   Tue May 19 15:24:06 2020 ranaUpdateBHDBHD mode-matching studyIt would be good to have a corner
plot with all the distances/ RoCs. Also
perhaps a Jacobian
  
  15338   Tue May 19 15:39:04 2020 YehonathanUpdateLoss Measurement40m Phase maps loss estimationI have a serious concern about this low
angle scattering analysis:

Phase maps perturb the spatial
 Mode_power_fraction1.pdf 
  15339   Wed May 20 18:45:22 2020 HangUpdateBHDBHD mode-matching study--corner plot & adjustment requirementAs Rana suggested, we present the
scattering plot of the AS path
mode matching for various variables.
 AS_MM_scat2.pdfAS_MM_adj2.pdf 
  15340   Wed May 20 19:34:58 2020 KojiUpdateGeneralITM spares and New PR3 mirrors transported to Downs for phasemap measurementTwo ITM spares (ITMU01/ITMU02) and five
new PR3 mirrors (E1800089 Rev 7-1~Rev7-5)
were transported to Downs for phasemap measurement
 container.jpg 
  15341   Wed May 20 20:10:34 2020 rana, John ZUpdateComputer Scripts / ProgramsNDS2 server / conf updated - seems OK nowWe noticed about a week ago that
the NDS2 channel lists were not getting updated
on megatron. JZ and I investigated; he was
  
  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 
  15344   Fri May 22 10:14:47 2020 JordanUpdateGeneralNitrogen ReplacementI was in the lab for Clean and Bake activities
and I replaced an empty N2 tank. Left tank
is at 2600 psi right tank at ~1300 psi.
  
  15345   Fri May 22 10:37:41 2020 ranaUpdateComputer Scripts / ProgramsNDS2 service restartedwas dead again this morning - JZ
notified

current restart instructions (after
  
  15346   Mon May 25 10:54:41 2020 ranaUpdateComputer Scripts / ProgramsNDS2 service restartedso far it has run through the weekend with
no problems (except that there are huge log
files as usual).
  
  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 
  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,
  
  15374   Thu Jun 4 00:21:28 2020 KojiSummaryCOCITM spares and New PR3 mirrors transported to Downs for phasemap measurementGariLynn worked on the measurement of E1800089
mirrros.
  
  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
  
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