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  40m Log, Page 292 of 346  Not logged in ELOG logo
ID Date Author Typedown Category Subject Text Attachments
  11524   Sat Aug 22 15:48:32 2015 KojiSummaryLSCArm locking recoveryAs per Ignacio's request, I restored
the arm locking.

- MC WFS relief
  
  11551   Tue Sep 1 02:44:44 2015 KojiSummaryCDSc1oaf, c1mcs modified for the IMC angular FF[Koji, Ignacio]

In order to allow us to work on
the IMC angular FF, we made the signal paths
 c1oaf_screenshot1.pngc1oaf_screenshot2.pngc1mcs_screenshot.pngOAF_MEDM1.pngOAF_MEDM2.png 
  11569   Thu Sep 3 19:52:24 2015 ranaSummarySUSSUS drift monitorSince Andrey's SUS Drift mon screen
back in 2007, we've had several versions
which used different schemes and programming
 07.png 
  11590   Thu Sep 10 09:37:34 2015 IgnacioSummaryIOOFilters left on MCL static moduleThe following MCL filters
were left loaded in the T240-X and T240-Y
  
  11597   Tue Sep 15 01:14:10 2015 ranaSummaryLSCneed to check LSC Whitening switch logic ... againTonight we noticed that the REFL_DC signal
has gone bipolar, even though the whitening
gain is 0 dB and the whitening filter is
  
  11598   Tue Sep 15 15:01:23 2015 ranaSummaryLSCdisabling the LSC AA filters + mod to whiteningWhile investigating the BIO situation with
the LSC machine and the iscaux2 processor
last night, we wondered if maybe the Anti-Aliasing
  
  11599   Tue Sep 15 15:10:48 2015 gautam, ericq, ranaSummaryLSCPRFPMI lock & various to-do's[SIZE=3]I was observing Eric while he was
attempting to lock the PRFPMI last night.
The handoff from ALS to LSC was not very
 powerSpec0915.pdf 
  11601   Tue Sep 15 18:35:21 2015 ericqSummaryLSCsome further notesAbout the analog CARM control with ALS:

We're looking at using a Sigg
designed remotely switchable delay line box
  
  11603   Tue Sep 15 20:44:13 2015 gautamSummaryLSCChecking the delay line phase shifter DS050339I checked out the delay line phase shifter
[URL=https://dcc.ligo.org/public/0016/D050339/000/D050339-A.pdf]D050339[/URL],
([URL=https://dcc.ligo.org/public/0001/T050250/001/T050250-v1.pdf]theory
 IMG_20150915_193100.jpgCalibration.pdf 
  11604   Wed Sep 16 03:37:06 2015 KojiSummaryGreen LockingWorkable delay line setup prepared[Koji Gautam]

The variable delay line has been
setup for practical use. The hardware and
 6x 
  11606   Wed Sep 16 15:04:33 2015 ericqSummaryLSCDC PD Whitening Board Fixed


  
  11609   Thu Sep 17 03:48:10 2015 ericqSummaryLSCsome further notesSomething odd is happening with the CM
board. Measuring from either input to OUT1
(the "slow output") shows a nice
  
  11611   Thu Sep 17 13:06:05 2015 ericqSummaryLSCLow input impedance on CM boardAs it turns out, our version of the common
mode board does not have
high input impedence. I think this is what
  
  11615   Thu Sep 17 19:58:06 2015 gautamSummaryComputer Scripts / ProgramsFrequency counting algorithmI made some changes to the c1tst model
running on c1iscey in order to test my algorithm
for frequency counting. I followed the steps
  
  11628   Mon Sep 21 18:31:06 2015 gautamSummaryComputer Scripts / ProgramsFrequency counting algorithmI have been
working on setting up a frequency counting
module that can give us a readout of the
 6x 
  11629   Mon Sep 21 23:18:55 2015 ericqSummaryComputer Scripts / ProgramsFrequency counting algorithmI definitely think lowpassing the output
is the way to go. Since this frequency readback
will be used for slow control of the beatnote
  
  11631   Tue Sep 22 02:11:17 2015 ranaSummaryComputer Scripts / ProgramsFrequency counting algorithmI was going to suggest using a software
PLL, but perhaps averaging gives the same
result. The same ADC signal can be fed to
  
  11635   Tue Sep 22 16:52:36 2015 ericqSummaryGeneralRandom NotesSome things bouncing around my head that
haven't made it to ELOG yet:


Last week, Rana and I were
  
  11763   Fri Nov 13 22:32:54 2015 KojiSummaryPSLPMC LO degraded, usual ERA-5 replacement, LO recovered[Yutaro, Koji]

We found that the PMC LO level
was fluctuating in a strage way (it was not
 PMC_LO.pngIMG_2093.JPGIMG_2091.JPGIMG_2095.JPGIMG_2096.JPG 
  11764   Sat Nov 14 00:52:25 2015 KojiSummaryCDSInvestion on EPICS freeze[Yutaro, Koji]

Recently "EPICS Freeze"
is so frequent and the normal work on the
  
  11765   Sun Nov 15 22:43:48 2015 KojiSummaryPSLPMC LO degraded, usual ERA-5 replacement, LO recoveredI think the IMC locking was somewhat improved.
Still it is not solid as long time before.

Before the PMC fix (attachment
 C1-MULTI_E6875C_TIMESERIES-1131408017-86400.pngC1-MULTI_E6875C_TIMESERIES-1131580817-86400.png 
  11768   Mon Nov 16 19:05:59 2015 KojiSummaryPSLPMC servo circuit review, follow up measurementsPMC follow up measurements have been done.
The servo circuit was reviewed.

Now the PMC, IMC, X/Y arms are
  
  11769   Mon Nov 16 21:32:49 2015 KojiSummaryPSLPMC servo circuit review, follow up measurementsThe result of the precise inspection
for the PMC servo board for the 40m was done.

The record, including the
  
  11775   Tue Nov 17 16:21:10 2015 KojiSummaryPSLPMC servo circuit review, follow up measurementsI'm still analyzing the open loop TF
data. Here I report some nominal settings
of the PMC servo
  
  11776   Tue Nov 17 20:40:08 2015 yutaroSummaryASCLoss maps of arm cavitiesIn preparation for the measurement of loss
maps of arm cavities, I measured the relationship
between:
  
  11780   Wed Nov 18 16:51:58 2015 KojiSummaryPSLPMC servo calibrationSummary

The PMC servo error (MIX OUT MON
on the panel) and actuation (HV OUT MON)
 PMC_err_cal.pdf 
  11781   Wed Nov 18 16:53:17 2015 KojiSummaryPSLPMC PZT capacitanceThe PMC PZT capacitance was measured.
- Turn off the HV supplies. Disconnect
HV OUT cable.
  
  11782   Wed Nov 18 17:09:22 2015 KojiSummaryPSLPMC Servo analysisSummary

The PMC servo was analysed. OLTF
was measured and modeled by ZPK (Attachment
 PMC_OLTF.pdfPMC_DSP.pdf 
  11792   Fri Nov 20 09:45:39 2015 steveSummarySUSoplev laser summary  




 oplev_summery.png 
  11793   Fri Nov 20 15:44:12 2015 KojiSummaryPSLAdded 17.5kHz LPF to the PMC servoAs a final tune of the PMC servo, I've
added 1nF cap at the error signal amplification
stage. The diagram has been updated and uploaded
 PMC_OLTF.pdfPMC_noise_comparison.pdf 
  11818   Fri Nov 27 03:38:23 2015 yutaroSummaryLSCround trip loss of Y armTonight I measured "loss map"
of ETMY. The method to calculate round trip
loss is same as written in elog
 image1.png 
  11857   Mon Dec 7 11:11:25 2015 yutaroSummaryLSCround trip loss of X armOn the day before yesterday and in this
morning, I measured loss map of ETMX. I reported
the method I used to change the beam spot
 image1-2.JPGsymmetry.png 
  11861   Tue Dec 8 11:24:45 2015 yutaroSummaryComputer Scripts / ProgramsScripts for loss map measurementHere I explain usage of my scripts
for loss map measurement. There are 7 script
files in a same directory /opt/rtcds/caltech/c1/scripts/lossmap_scripts. With
  
  11864   Tue Dec 8 15:57:16 2015 yutaroSummaryLSCPower recycling gain estimation from arm loss measurementI estimated power recycling gain with the
results of arm loss measurement.

From elog
  
  11867   Wed Dec 9 18:45:58 2015 KojiSummaryGeneralNetwork Topology Check[Eric Q, Gautam, Koji]

We went through the network connections
to produce the mapping of the instruments.
 Network_topology_9Dec2015.xlsxNetwork_topology_9Dec2015.pdf 
  11876   Fri Dec 11 23:12:09 2015 KojiSummaryCOCLoss map measurement documentYutaro left detailed slides for his loss
map measurement

https://dcc.ligo.org/LIGO-G1501547
  
  11900   Wed Dec 23 15:43:02 2015 ranaSummaryPSLPMC FSS IMC RF summing boxThe EOM upstream of the PMC is used as
the phase corrector for the FSS/IMC servo.
It is also used to apply the 35.5 MHz PDH
 PMCFSSsummingBox.png 
  12000   Fri Feb 19 15:12:38 2016 KojiSummaryPEMGuralp Health CheckI measured the guralp raw outputs
and the TFs using the handheld unit and an
FFT analyzer.
 Guralp_Raw_PSD.pdflow_vel_comparison.pdfGuralp_TF.pdf 
  12032   Sat Mar 12 22:23:37 2016 ranaSummaryIOOPMC relockedFound it locked on TEM01 mode.

Sweets in the fridge for non-PhD
holders, courtesy of the highest levels of
  
  12044   Wed Mar 23 15:23:12 2016 SteveSummaryPEMGuralps as connectedWe have one calibration sheet of GUR- B, from 26
June 2008,    model CMG-T40-0008, 
 GUR_A.jpgGUR_B.jpgGUR_Interface_Box.jpg 
  12093   Wed Apr 27 14:06:31 2016 ranaSummaryGeneralmeeting notes
Gautam will get
help from Johannes and finish EX table by
Monday.
Steve
  
  12102   Mon May 2 17:06:58 2016 ranaSummaryCOCG&H optics to Fullerton/HWS for anneal testingSteve sent 4 of our 1" diameter G&H
HR mirrors to Josh Smith at Fullerton for
scatter testing. Attached photo is our total
 20160427_182305.jpg 
  12125   Mon May 23 10:55:49 2016 steveSummarySUSITMX oplev laser replaced 

     
May 23, 2016            
 ITMXoplev.png 
  12126   Mon May 23 15:51:32 2016 steveSummarySUSoplev laser summary updated 




 oplSum.png 
  12128   Tue May 24 10:21:36 2016 ericqSummarySUSITMX Oplev loopsI did a quick measurement of the ITMX oplev
loops, both pitch and yaw have about the
same upper UGF as previous measurements with
  
  12175   Tue Jun 14 11:29:25 2016 JohannesSummaryASCYArm OpLev CalibrationIn preparation for the armloss map I checked
the calibration of the Y-Arm ITM and ETM
OpLevs with the method originally described
 CavityCoupling.pdf 
  12223   Tue Jun 28 20:43:23 2016 KojiSummaryCOCFirst Contact cleaning practiceMade a dry run of the in-situ cleaning
for a 3inch optic.

Attachment 1: The Al dummy mass
 7x 
  12239   Fri Jul 1 17:51:28 2016 PrafulSummaryElectronicsReplacing DIMM on OptimusThere has been an ongoing memory error
in optimus with the following messages:

controls@optimus|~
  
  12306   Fri Jul 15 17:44:37 2016 AakashSummaryGeneralAcromag Setup | SURF2016Aidan has described the physical connections
and initial setup here :  https://nodus.ligo.caltech.edu:30889/ATFWiki/doku.php?id=main:resources:computing:acromag#recovering_from_a_terminal_power_communication_outage 
.
  
  12337   Tue Jul 26 14:24:38 2016 KojiSummaryVACPurge compressed air system at LHOI've visited the purge clean
air system at LHO Yarm mid-station with John
Worden.
 12x 
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