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ID Date Author Type Category Subjectup Text Attachments
  15906   Thu Mar 11 20:18:00 2021 gautamUpdateLSCHigh bandwidth POYI repeated the high bandwidth POY locking
experiment.


The "Q" demod
 OLGevolution.pdfinLoopSpec.pdf 
  7829   Fri Dec 14 03:32:51 2012 AyakaUpdateLSCHigh frequency noise in AS signalI calibrated the AS error signal into the
displacement of the YARM cavity in the same
way as I did before (elog).
 XARM_OL.pdfAS_ITMXexc.pdfASspe_noise.pdfASgain.pngASspe.tar.gz 
  7832   Fri Dec 14 09:31:59 2012 ranaUpdateLSCHigh frequency noise in AS signalThis is NOT calibrated. Its sort of calibrated
in the 500-1000 Hz area, but does not correctly
use the loop TF or the cavity pole.
  
  7833   Fri Dec 14 10:09:30 2012 AyakaUpdateLSCHigh frequency noise in AS signal

    

       
            
  
  7835   Fri Dec 14 16:35:38 2012 AyakaUpdateLSCHigh frequency sensitivity improvedSince I found that the the AS sensitivity
seems to be limited by circuit noise, I inserted
a RF amplifier just after the AS RF output.
 ASspe_noise_amp.pdfASspe_acoustic_amp.pdfASnoise.tar.gz 
  9716   Tue Mar 11 15:19:45 2014 JenneUpdateElectronicsHigh gain Trans PD electronics changeAs
part of our CESAR testing last night, we
had a look at the noise of the 1/sqrt(TR)
 IMG_1309.JPG 
  9720   Tue Mar 11 19:07:24 2014 ericqUpdateElectronicsHigh gain Trans PD electronics changeSpeaking of the whitening board, I had
neglected to post details showing the the
whitening was at least having a positive
 SQRTINVwhitening.pdfsqrtinvWhitening.zip 
  9823   Thu Apr 17 16:04:40 2014 JenneUpdateElectronicsHigh gain Trans PD electronics change 
 I have made the same modification
to the Yarm trans PD whitening board as was
  
  9585   Wed Jan 29 16:36:37 2014 KojiSummaryGeneralHigh power beam blasting of the aLIGO RFPD [Rich, Jay, Koji]
We blasted the aLIGO RF PD with a
1W IR beam. We did not find any obvious damage.
  
  16023   Tue Apr 13 19:24:45 2021 gautamUpdatePSLHigh power operationsWe (rana, yehonathan and i) briefly talked
about having high power going into the IFO.
I worked on some calcs a couple of years
 intensityDist.pdfclippingLoss.pdf 
  3300   Tue Jul 27 16:33:50 2010 KojiSummaryGeneralHigh school students tourJenne made the 40m tour for the annual
visit of 30-40 students.
c.f.
 IMG_2657.jpg 
  1097   Tue Oct 28 11:10:18 2008 AlbertoUpdateLSCHigher Order Mode resonances in the X arms[quote]Recently we had been having some trouble
locking the full IFO in the [COLOR=green][I][FONT=Verdana]spring[/FONT][/I][/COLOR]
configuration (SRC on [COLOR=blue]+166[/COLOR]).
 HOM_resonances_Xarm.png 
  10494   Thu Sep 11 02:08:32 2014 JenneUpdateLSCHigher transmission powersNo breakthroughs tonight. 
DRMI didn't want to lock with either
the recipe that we used a year ago (elog
 Zoom_TRXTRYat7_CARMsqrtInvTrans_DARMalsdiff.pngALSonly_TryingTransitionStraightToREFLDC.png 
  768   Wed Jul 30 13:14:03 2008 KojiSummaryIOOHistory of the MC abs lengthI was notified by Rob and Rana that there
were many measurements of the MC abs length
(i.e. modulation 
 MC_length.png 
  770   Wed Jul 30 15:12:08 2008 ranaSummaryIOOHistory of the MC abs length> I was notified by Rob and Rana that there
were many measurements of the MC abs length
(i.e. modulation 
  
  10491   Wed Sep 10 21:05:43 2014 JenneUpdateLSCHoly sensitivity, Batman!Koji and Manasa did some work on the PSL
green situation today (Koji is still writing
that log post up), but I just measured the
 ALS_Y_outOfLoop_10Sept2014.pdfALS_XY_outOfLoop_10Sept2014.pdf 
  10497   Fri Sep 12 00:28:04 2014 ericqUpdateLSCHoly sensitivity, Batman!I took a quick measurement of the ALS stability,
using POX and POY as out of loop sensors,
using a CARM calibration line to line POX
 ALSoutOfLoop.pdf 
  14573   Thu Apr 25 10:25:19 2019 gautamUpdateFrequency noise measurementHomodyne v HeterodyneIf I understand correctly, the Mach-Zehnder
readout port power is only a function of
the differential phase accumulated between
  
  14576   Thu Apr 25 15:47:54 2019 AnjaliUpdateFrequency noise measurementHomodyne v HeterodyneMy understanding is that the main advantage
in going to the heterodyne scheme is that
we can extract the frequecy noise information
 Experimental_setup.JPG 
  2952   Wed May 19 16:00:18 2010 JenneUpdateIOOHooray! We locked the MC! (and some other stuff)[Jenne, Kevin]
We opened up the MC chambers again,
and successfully got the MC locked today! 
  
  2954   Wed May 19 22:28:05 2010 KojiUpdateIOOHooray! We locked the MC! (and some other stuff)Good! What was the key?
The MC2 spot looks very high, but
don't believe the TV image. Believe the result
  
  11938   Wed Jan 20 02:53:18 2016 ericqUpdateLSCHopeful signs[ericq, Gautam]

We gave DRFPMI locking a shot,
with the ALS out-of-loop noises as attached.
 2016-01-20_ALSOOL.pdf 
  11941   Thu Jan 21 00:02:11 2016 KojiUpdateLSCHopeful signsThat's a good news. Only quantitative
analysis will tell us if it is true or not.

Also we still want to analyze the
  
  13647   Wed Feb 21 17:20:32 2018 johannesUpdateVACHornet gauge connected to DAQ.I wired the six available BNC connectors
on the front panel of the new XEND slow DAQ
to physical Acromag channels. There were
 VacLog.png 
  4856   Wed Jun 22 17:35:35 2011 IshwitaUpdateGeneralHot air stationThis is the new hot air station for the
40m lab.........
 
 P6220212.JPGP6220213.JPG 
  11634   Tue Sep 22 16:42:39 2015 ericqUpdateIOOHousekeepingI've moved the OAF MC2 signal path
to go directly from c1oaf to c1mcs, so that
the LSC being ON/OFF doesn't interfere
  
  15829   Sat Feb 20 16:20:33 2021 gautamUpdateGeneralHousekeeping + PRMI charIn prep to try some of these
debugging steps, I did the following.


ndscope updated from 0.7.9 to
 IPPOSdeat.pdfTTdrift.pdfPOXnPOY.pdfPRMI.pdf 
  15831   Sun Feb 21 20:51:21 2021 ranaUpdateGeneralHousekeeping + PRMI charI'm curious to see if the demod phase
for MICH in REFL & AS chamges between
thi simple Mcihelson and PRMI. IF there's
  
  15875   Sun Mar 7 15:26:10 2021 gautamUpdateLSCHousekeeping + more PRMI
Beam pointing into PMC was tweaked
to improve transmission.
AS110
photodiode was re-installed on the AS table
 PRMI_SBres.pngMICH_act_calib.pdf 
  16994   Tue Jul 12 19:46:54 2022 PacoSummaryALSHow (not) to take NPRO PZT transfer function[Paco, Deeksha, rana]

Quick elog for this evening:


Rana disabled MC servo
  
  4005   Thu Dec 2 00:34:32 2010 ranaHowToLSCHow Does Cavity Locking Work (answered by Nikon)https://nodus.ligo.caltech.edu:30889/gw.swf
  
  3822   Fri Oct 29 11:29:29 2010 josephbUpdateCDSHow I broke the frame builder yesterdayProblem:
Long before Yuta came along and deleted
daqd, I had done something to prevent the
  
  9093   Mon Sep 2 03:51:14 2013 ranaHowToGeneralHow To Coil Cables http://youtu.be/pEd7ru24Vx0   
  9097   Tue Sep 3 10:54:33 2013 SteveHowToGeneralHow To Coil Cables

    

       
            
  
  1589   Fri May 15 14:05:14 2009 DmassHowToComputersHow To: Crash the ElogThe Elog started crashing last night. It
turns out I was the culprit, and whenever
I tried to upload a certain 500kb .png picture,
  
  7484   Thu Oct 4 22:27:54 2012 KojiUpdateSUSHow about the slow machines?One terrible concern of mine is that the
slow machines were rebooted at the power
  
  7485   Thu Oct 4 22:35:16 2012 DenUpdateSUSHow about the slow machines?

    

       
            
  
  7489   Fri Oct 5 04:34:31 2012 ranaUpdateSUSHow about the slow machines?

    

       
            
  
  12639   Wed Nov 23 17:48:16 2016 rana, kojiUpdateIOOHow bad is the McWFS?Medium.


Previous elog entries on
this:
  
  10391   Thu Aug 14 19:23:25 2014 ranaHowToIOOHow do I set the FSS offset to make the PZT voltage start at the right place? When the IMC locks, we want the FAST
OUT of the TTFSS box to be close to zero
volts. We also want the control signal from
  
  1911   Sat Aug 15 18:35:14 2009 ClaraFrogsComputersHow far back is complete data really saved? (or, is the cake a lie?)I was told that, as of last weekend, we
now have the capability to save full data
for a month, whereas before it was something
  
  7765   Fri Nov 30 09:59:53 2012 SteveHowToGeneralHow not toClean cabinet S15 doors were left open.
You have to lock it up!
  
  3733   Mon Oct 18 09:01:48 2010 steveHowToGeneralHow not to This BNC cable is crying for help. Please
do not do this to me.  It should be
reported  to the  abused center.Throw
 P1060926.JPG 
  11459   Wed Jul 29 14:32:01 2015 SteveUpdateGeneralHow not to solder 




 coldSoldering.jpg 
  11701   Tue Oct 20 11:24:29 2015 ericqHowToLSCHow to DRFPMIHerein,
I will describe
the current settings and procedures used
  
  2403   Sat Dec 12 07:36:56 2009 ranaHowToElectronicsHow to Measure the Length of a Cable: InterferometryNeed to measure the length   
  2316   Mon Nov 23 19:36:28 2009 JenneUpdateAdaptive FilteringHow to add ASS channels, so that they're saved to frames[Jenne, Sanjit]
We would like several channels from
the OAF/ASS screen to be saved to frames,
  
  14371   Wed Dec 19 22:11:28 2018 KojiUpdateGeneralHow to align the copper OMCThe OMC input optics layout is attached

Checked the spot position on OMMT-FM1.
It was off from the center. This was causing
 110804_40m_OMC_layout.pdfOMC_alignment.pdf 
  16158   Mon May 24 20:55:00 2021 KojiSummaryBHDHow to align two OMCs on the BHD platform?Differential
misalignment of the OMCs

40m BHD will employ two OMCs on
  
  8265   Sun Mar 10 13:29:29 2013 KojiHowToIOOHow to calculate the accumulated round-trip Gouy phaseHow to calculate the accumulated round-trip
Gouy phase (and namely the transverse mode
spacing) of a general cavity
  
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