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ID Date Author Typeup Category Subject Text Attachments
  10780   Thu Dec 11 12:50:12 2014 manasaSummaryGeneralPSL table optical layout I assembled the telescope to couple
PSL light into the fiber. The maximum coupling
that I could obtain was 
  
  10787   Thu Dec 11 23:34:06 2014 manasaSummaryGeneralPSL table optical layout

    

       
            
  
  10788   Fri Dec 12 02:30:25 2014 JenneSummaryGeneralPSL table optical layout

    

       
            
  
  10791   Fri Dec 12 14:38:39 2014 manasaSummaryGeneralFrequency Offset Locking - To Do List (Revised)Unfortunately the order placed for beam
samplers last week did not go through. These
will be used at the X and Y end tables to
 FOLtodolist.pdf 
  10792   Fri Dec 12 15:19:04 2014 manasaSummaryGeneralDec 12 - PSL table

    

       
            
 PSLtoFiber.pngPSLfiberChassis.pngPSLfiberChassis.png 
  10800   Mon Dec 15 22:40:09 2014 ranaSummaryPSLPMC restored Found that the PMC gain has been
set to 5.3 dB instead of 10 dB since 9 AM
this morning, with no elog entry.
 SadToastFace.jpg 
  10808   Wed Dec 17 11:57:56 2014 manasaSummaryGeneralY arm optical layoutI
was working around the PSL table and Y endtable
today.
 58.png 
  10829   Mon Dec 22 15:46:58 2014 KurosawaSummaryIOOSeven transfer functionsIMC OL TF has been measured from 10K to
10M
 MC_OLTF.pdf 
  10849   Tue Dec 30 20:35:59 2014 ranaSummaryPSLPMC Tune Up
    Calibrated the Phase Adjust
slider for the PMC RF Modulation; did this
by putting the LO and RF Mod out on the TDS
 17.pngPMCcal.ipynb.xzPMC_Osc_Cal.pdf 
  10879   Thu Jan 8 19:02:42 2015 JaxSummaryElectronicsMC demod modificationsHere's a summary of the changes made
to the D990511 serial 115 (formerly
known as REFL 33), as well as a short procedure.
 demodprocessI.pngdemodprocessQ.pngIMG_0247.JPGIMG_0239.JPGIMG_0243.JPG 
  10899   Wed Jan 14 02:11:07 2015 ranaSummaryTreasure2-loop Algebra LoopologyI show here
the matrix formalism to calculate analytically
the loop TF relationships for the IMC w/
 FSSloop.pdfFSSloop.png 
  10952   Wed Jan 28 23:53:24 2015 KojiSummaryASCXarm ASS fixX-Arm
ASS was fixed.
ASS_DITHER_ON.snap was updated so
 12.png 
  10974   Wed Feb 4 18:27:55 2015 KojiSummaryASCXarm ASS fixPlease remember
that Xarm ASS needs FM6 (Bounce filters)
  
  10986   Sat Feb 7 13:34:11 2015 KojiSummaryPSLISS AOM driver checkI wanted to check the status of the ISS.
The AOM driver response was measured on Friday
night.
 AOM_drive.pdfAOM_response.pdf 
  10988   Sun Feb 8 21:54:50 2015 ranaSummaryPSLISS AOM driver checkThis is good
news. It means that the driver probably won't
limit the response of the loop - I expect
  
  11005   Wed Feb 11 18:11:46 2015 KojiSummaryLSC3f modulation cancellation33MHz sidebands can be elliminated by careful
choice of the modulation depths and the relative
phase between the modulation signals.
  
  11029   Sat Feb 14 19:54:04 2015 KojiSummaryLSC3f modulation cancellationOptical
Setup

[Attachment 1]
 beat_setup1.JPGbeat_setup2.JPGelectrical_setup.pdf 
  11031   Sat Feb 14 20:37:51 2015 KojiSummaryLSC3f modulation cancellationExperimental
results

- PD response [Attachment
 beat_pd_response.pdfbeat_nominal.pdf3f_reduction.pdfbeat_3f_reduced.pdf 
  11032   Sat Feb 14 22:14:02 2015 KojiSummaryLSC[HOW TO] 3f modulation cancellationWhen I finished my measurements, the modulation
setup was reverted to the conventional one.
If someone wants to use the 3f cancellation
 freq_gen_box.JPGdelay_line.JPGcable_spec.pdf 
  11033   Sun Feb 15 16:20:44 2015 KojiSummaryLSC[ELOG LIST] 3f modulation cancellationSummary
of the ELOGS

3f
modulation cancellation theory 
  
  11034   Sun Feb 15 20:55:48 2015 ranaSummaryLSC[ELOG LIST] 3f modulation cancellationI wonder if DRMI can be locked on 3f using
this lower 55 MHz modulation depth. It seems
that PRMI should be unaffected, but that
  
  11035   Mon Feb 16 00:08:44 2015 KojiSummaryLSC[ELOG LIST] 3f modulation cancellationThis KTP crystal has the maximum allowed
RF power of 10W (=32Vpk) and V_pi = 230V.
This corresponds to the maximum allowed
  
  11036   Mon Feb 16 01:45:12 2015 KojiSummaryLSCmodulation depth analysisBased on the measured modulation profiles,
the depth of each modulation was estimated.
Least square sum minimization of the
 modulation_nominal.pdfmodulation_3f_reduced.pdf 
  11106   Fri Mar 6 00:59:13 2015 ranaSummaryIOOMC alignment not drifting; PSL beam is driftingIn the attached plot you can see that the
MC REFL fluctuations started getting larger
on Feb 24 just after midnight. Its been bad
 MCdrfit.png 
  11109   Fri Mar 6 13:48:17 2015 dark kiwamuSummaryIOOtriple resonance circuitI was asked by Koji to point out where
a
schematic of the triple resonant circuit
  
  11112   Fri Mar 6 19:54:15 2015 ranaSummaryIOOMC alignment not drifting; PSL beam is driftingMC Refl
alignment follow up: the alignment from last
 Untitled.png 
  11134   Wed Mar 11 19:15:03 2015 KojiSummaryLSCROUGH calibration of the darm spectrum during the full PRFPMI lockI made very rough calibration of
the DARM spectra before and after the transition
for the second lock on Mar 8.
 150308_DARM_ROUGH_CALIB.pdf 
  11147   Thu Mar 19 16:58:19 2015 SteveSummaryIOOMC alignment not drifting; PSL beam is driftingPolaris mounts ordered.




 driftingInputBeam2.jpg 
  11148   Thu Mar 19 17:11:32 2015 steveSummarySUSoplev laser summary updated          
March  19, 2015   2 
new  JDSU 1103P, sn P919645 & P919639
  
  11149   Fri Mar 20 10:51:09 2015 SteveSummaryIOOMC alignment not drifting; PSL beam is driftingAre the two  visible small srews holding
the adapter plate only?

If yes, it is the weakest point
 eom4.jpgeom3.jpg 
  11158   Mon Mar 23 09:42:29 2015 SteveSummaryIOO4" PSL beam path postsTo achive the same beam height each components
needs their specific post height.

 .75odSSpost.pdfMC_mml_trans_clamp.jpgPMCmmLn.jpg 
  11171   Wed Mar 25 18:27:34 2015 KojiSummaryGeneralSome maintainance- I found that the cable for the AS55 LO
signal had the shielding 90% broken. It was
fixed.
  
  11173   Wed Mar 25 18:48:11 2015 KojiSummaryLSC55MHz demodulators inspection[Koji Den EricG]

We inspected the {REFL, AS, POP}55
demodulators.
  
  11180   Fri Mar 27 20:32:17 2015 KojiSummaryLSCLocking activity- Adjutsed the IMC WFS operating point.
The IMC refl is 0.42-0.43.

- The arms are aligned with ASS
  
  11235   Wed Apr 22 11:48:30 2015 manasaSummaryGeneralDelay line frequency discriminator for FOL error signalSince the Frequency counters have not been
a reliable error signal for FOL PID loop,
we will put together an analog delay line
  
  11236   Wed Apr 22 14:56:18 2015 manasaSummaryGeneralDelay line frequency discriminator for FOL error signal[Koji, Manasa]

Since the bandwidth of the fiber
PD is ~ 1GHz, we could design the frequency
  
  11245   Fri Apr 24 21:31:20 2015 KojiSummaryCDSautomatic mxstream resettingWe were too much annoyed by frequent stall
of mxstream. We'll update the RCG when
time comes (not too much future).
  
  11252   Sun Apr 26 00:56:21 2015 ranaSummaryComputer Scripts / Programsproblems with new restart procedures for elogd and apacheSince the nodus upgrade, Eric/Diego changed
the old csh restart procedures to be more
UNIX standard. The instructions are in the
  
  11267   Fri May 1 20:33:31 2015 ranaSummaryComputer Scripts / Programsproblems with new restart procedures for elogd and apacheSame thing again today. So I renamed the   
  11268   Sun May 3 01:04:19 2015 ranaSummaryPEMSeismo signals are badhttps://ldas-jobs.ligo.caltech.edu/~max.isi/summary/day/20150502/pem/seismic/

Looks like some of our seismometers
are oscillating, not mounted well, or something
  
  11270   Mon May 4 10:21:09 2015 manasaSummaryGeneralDelay line frequency discriminator for FOL error signalAttached is the schematic of the analog
DFD and the plot showing the zero-crossing
for a delay line length of 27cm. The bandwidth
 DFD.pngDFD_resp.png 
  11272   Mon May 4 12:42:34 2015 manasaSummaryGeneralDelay line frequency discriminator for FOL error signalKoji suggested that I make a cosine fit
for the curve instead of a linear
fit.
 DFD_cosfit.png 
  11300   Mon May 18 14:46:20 2015 manasaSummaryGeneralDelay line frequency discriminator for FOL error signalMeasuring the voltage noise
and frequency response of the Analog Delay-line
Frequency Discriminator (DFD)
 DFDnoise.pngDFDnoise_AC.pngFreqResp.pngDFD.zip 
  11368   Mon Jun 22 12:57:09 2015 ericqSummaryLSCX/Y green beat mode overlap measurement redoneI took measurements at the green beat setup
on the PSL table, and found that our power
/ mode overlap situation is still consistent
  
  11370   Mon Jun 22 14:53:37 2015 ranaSummaryLSCX/Y green beat mode overlap measurement redone
Why is there a factor of 20 power
difference? Some of it is the IR laser power
difference, but I thought that was just a
  
  11384   Tue Jun 30 11:33:00 2015 JamieSummaryCDSprepping for CDS upgradeThis is going to be a big one.  We're
at version 2.5 and we're going to go
to 2.9.3.
  
  11390   Wed Jul 1 19:16:21 2015 JamieSummaryCDSCDS upgrade in progressThe CDS upgrade is now underway

Here's
what's happened so far:


Installed and linked in
  
  11392   Tue Jul 7 17:22:16 2015 JessicaSummary Time Delay in ALS CablesI measured the transfer functions in the
delay line cables, and then calculated the
time delay from that.
 cableA_fit.jpgcableA_resid.jpgcableB_fit.jpgcableB_resid.jpg 
  11393   Tue Jul 7 18:27:54 2015 JamieSummaryCDSCDS upgrade: progress!After a couple of days of struggle, I made
some progress on the CDS upgrade today:

 2.9-RTS-OK.pngC1X04_GDS_TP.png 
  11395   Wed Jul 8 17:46:20 2015 JessicaSummaryGeneralUpdated Time Delay PlotsI re-measured the transfer function for
Cable B, because the residuals in my previous
post for cable B indicated a bad fit. 
 resid_CableA.pngresid_CableB.png 
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