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ID Date Author Type Category Subject Text Attachments
  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
  
  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 
  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 
  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 
  15354   Tue May 26 10:04:54 2020 JordanUpdateGeneralN2 ReplacementReplaced empty N2 tank, left tank at ~2000
psi, right tank ~2600 psi.
  
  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 
  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 
  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 
  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 
  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 
  15348   Tue May 26 02:15:36 2020 gautamUpdateLSCLock acquisition portal entrySummary:

Provided the IMC
is cooperative, the input pointing isn't
  
  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 
  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).
  
  15345   Fri May 22 10:37:41 2020 ranaUpdateComputer Scripts / ProgramsNDS2 service restartedwas dead again this morning - JZ
notified

current restart instructions (after
  
  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.
  
  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 
  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. 
  
  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
  
  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 
  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 
  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 
  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
  
  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 
  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
  
  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 
  15333   Thu May 14 19:00:43 2020 YehonathanUpdateLoss Measurement40m Phase maps loss estimationPerturbation theory:

The cavity modes 
  
  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 
  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.
  
  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 
  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 
  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
  
  15327   Tue May 12 20:16:31 2020 KojiUpdateLSCRelative importance of losses in the arm and PRCIs \eta_A the roundtrip loss for an arm?

Thinking about the PRG=10 you saw:
- What's the current PR2/3 AR?
  
  15326   Tue May 12 18:16:17 2020 gautamUpdateLSCRelative importance of losses in the arm and PRCAttachment
#1 is meant to show
 armLossVSPRCloss.pdf 
  15325   Tue May 12 17:51:25 2020 ranaSummaryComputer Scripts / Programsupdated LESS syntax highlight on nodusapt install source-highlight

then modified bashrc to point to
/usr/share instead of /usr/bin
  
  15324   Mon May 11 00:12:34 2020 gautamUpdateLSCRF only PRFPMIFinally - Attachment
#1. This plot uses
 PRFPMIlock.pdfIMG_8549.JPGIMG_8548.JPGDARM_OLTF.pdf 
  15323   Sat May 9 17:01:08 2020 YehonathanUpdateLoss Measurement40m Phase maps loss estimationI took the phase maps of the 40m X arm
mirrors and calculated what is the loss of
a gaussian beam due to a single bounce. I
 ITMX_Loss_Map.pdfETMX_Loss_Map.pdfITMX_Phase_Map_(nm).pdfETMX_Phase_Map_(nm).pdf 
  15322   Fri May 8 14:27:25 2020 HangUpdateBHDNew SRC gouy phase[Jon, Hang]

After updating the 40 m finesse
file to incorporate the new SRC length (and
 mode_spec_finesse.pdfmode_spec_ideal.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 "+"
  
  15320   Thu May 7 09:43:21 2020 ranaUpdateASCIMC WFSThis
is the doc from Keita Kawabe on why the
WFS heads should be rotated.
  
  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 
  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 
  15317   Sat May 2 02:35:18 2020 KojiUpdateALSASY M2 PZT damagedYes, we are supposed to have a few spare
PI PZTs.
  
  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,
  
  15315   Fri May 1 01:49:55 2020 gautamUpdateALSASY commissioningSummary:

It appears that the EY green steering
PZTs have somehow lost their bipolar actuation
  
  15314   Thu Apr 30 07:29:01 2020 ChubUpdateVACN2 delivered.Hi All,

The new nitrogen cylinders were
delivered to the rack at the west entrance.
  
  15313   Fri Apr 24 00:26:59 2020 ranaSummaryPEML.A. EQ from Tuesday night   April22-EQ.pdf 
  15312   Thu Apr 23 10:42:02 2020 ranaUpdatePSLFSS debugging attemptsI had set up the 4395 to do this automatically
a few years ago, but it looked
at the FSS/IMC instead. When the PCDRIVE
  
  15311   Thu Apr 23 09:52:02 2020 JonUpdateCamerasGigE w better NIR sensitivvityNice, and we should also permanently install
the camera server (c1cam)
which is still sitting on the electronics
  
  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 
  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
  
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