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ID Date Author Type Category Subject Text Attachments
  9821   Thu Apr 17 01:18:34 2014 JenneUpdateLSCAttempt at handing CARM to REFL11[Jenne, Koji]
This evening, Koji and I followed
the procedure from last night (elog
  
  9820   Thu Apr 17 01:01:02 2014 JenneUpdateLSCLSC model modificationsLast night, EricQ and I were concerned
that we might need some CARM UGF servoing,
so I added a UGF servo block, copied from
  
  9819   Thu Apr 17 00:49:06 2014 JenneUpdateLSCCARM and DARM on IR signals, boosts engagedI looked at 2 of the locklosses from last
night, (1:19am and 1:27am), and saw that
for both, the DARM loop started to oscillate
 Lockloss_DARMgainTooHigh_119am.pngLockloss_DARMgainTooHigh_127am.pngSmoothCARMandDARMtransitions_LSCboosts.png 
  9818   Wed Apr 16 02:29:30 2014 ericqUpdateLSCCARM and DARM on IR signals, boosts engaged As Jenne mentioned, we took OLTF
transfer functions, and determined that we
had more than enough phase margin to switch
 carmOLTF.pdfboostPlot.png 
  9817   Wed Apr 16 02:11:40 2014 JenneUpdateLSCCARM and DARM on IR signals, boosts engaged[Jenne, EricQ]
Tonight, we transitioned CARM
and DARM to IR signals, took loop transfer
  
  9816   Wed Apr 16 01:51:16 2014 JenneUpdateLSCScripts written for ALS acquisition, CARM and DARM transitions[Jenne, EricQ]
This evening, as part of locking
activities, we threw together some handy
  
  9815   Tue Apr 15 16:21:18 2014 KojiUpdateIOOMC2 LSC offset was set to be -5000Yesterday, MC2 alignment was slipping all
day. Even when the WFS was off (i.e. there
wa sno actuation), I had continual misalignment
  
  9814   Tue Apr 15 13:24:42 2014 SteveUpdatePSLlaser turned onThe 2W Innolight was off for 4 hours.  laserOff4hrs.pnglaserShutsDown.png 
  9813   Tue Apr 15 09:32:19 2014 GabrieleUpdateLSCMICH gets noisy as CARM or DARM offset reducedI guess this is normal. DARM has (almost)
the same effect of MICH on the corner interferometer
signals, just increased in amplitude by the
  
  9812   Tue Apr 15 08:55:57 2014 KojiUpdateLSCAnalog phasing of REFL11 and REFL55I have never used such a long cable for
RF phase adjustment. The speed of the signal
is 2e8 m/s and the frequency is ~10e6 Hz.
  
  9811   Tue Apr 15 02:26:45 2014 ericqUpdateLSCAnalog phasing of REFL11 and REFL55For future reference:
As we were poking around with the
common mode servo in an FPMI configuration,
  
  9810   Tue Apr 15 02:19:54 2014 JenneUpdateLSCAnalog phasing of REFL11 and REFL55[Jenne, EricQ]
I told Koji that I wanted to play
with the common mode servo this evening,
  
  9809   Mon Apr 14 19:02:09 2014 JenneUpdateLSCMICH gets noisy as CARM or DARM offset reducedThis afternoon, I was toying around with
reducing either the CARM or DARM offsets
(so, put in a CARM offset, leave DARM zero,
 MICH_fuzzy_when_offsets_small_longerData.pngTRX_TRY_100cts.pngMICH_fuzzy_when_offsets_small.png 
  9808   Mon Apr 14 17:59:05 2014 JenneConfigurationPEMNew T-240 cableAs payment for borrowing 2 of our seismometers,
Zach has made us a new Trillium cable, to
go from the granite station to the readout
  
  9807   Mon Apr 14 13:20:45 2014 JenneUpdateLSCIFO Configure screen updated, CARM / DARM scripts addedI have compressed the IFO Configure screen. 
All PRMI things (sideband lock and carrier
lock) are in the PRMI button, all arm things
  
  9806   Mon Apr 14 11:19:55 2014 JenneUpdateLSCMC WFS found offI'm not sure why, but the WFS were turned
off when I came in this morning.  The
MC was not staying locked, and even during
  
  9805   Sun Apr 13 13:03:34 2014 ranaUpdateLSC That's a very smooth DARM transition -
its good news that the dALS signals don't
have a huge offset w.r.t the real error signal.
  
  9804   Fri Apr 11 18:55:28 2014 manasaUpdateLSCarm length measurementsArm lengths were measured
using ALS
 Xarm.pngYarm.png40mCavLength.zip 
  9803   Fri Apr 11 16:04:31 2014 KojiUpdateLSCcongratulationIt's
just one of the stepping stones, but not
yet a mile stone.
  
  9802   Fri Apr 11 14:57:53 2014 steveUpdateLSCcongratulation 
 
 whenSheisHappy3h.pngmc4hArms3hrs.png 
  9801   Fri Apr 11 12:32:33 2014 ericqUpdateLSCCARM and DARM both on IR signals!!!!!!!!!

    

       
            
  
  9800   Fri Apr 11 12:21:27 2014 KojiUpdateLSCCARM and DARM both on IR signals!!!!!!!!!About the ADC range,
According to the elogs, DARM = AS55Q/400.
So in the current level, the error has +/-40cntpp
  
  9799   Fri Apr 11 11:58:24 2014 JenneUpdateLSCCARM and DARM both on IR signals!!!!!!!!! A few time series from last night's
data. 
300 seconds, starting from 1081240100,
 DARM_IN1_getsSmaller.pngDARM_CARM_TRX_TRY.pngCARMtransition_DARMtransition.pngDARMin_DARMout.pngCARM_DARM_in_out.png 
  9798   Fri Apr 11 10:30:48 2014 jamieUpdateLSCCARM and DARM both on IR signals!!!!!!!!!


   
        
            
  
  9797   Fri Apr 11 02:09:31 2014 JenneUpdateLSCCARM and DARM both on IR signals!!!!!!!!![EricQ, Jenne]
A few more details on our work for
the evening, of 
 IRlocks.pdf 
  9796   Fri Apr 11 01:02:07 2014 JenneUpdateLSCCARM and DARM both on IR signals!!!!!!!!![EricQ, Jenne]
We're still working, but I'm really
excited, so here's our news: 
 onlyIRspectra.pdf 
  9795   Thu Apr 10 16:09:29 2014 SteveUpdateVACRGA scan at 75% pumping speed

    

       
            
 520HzpumpingSpeed.png 
  9794   Thu Apr 10 10:52:15 2014 manasaSummaryIOOMC2_TRANS path in WFS servo

    

       
            
  
  9793   Thu Apr 10 01:56:05 2014 JenneUpdateLSCCARM transitioned to IR error signals![Jenne, EricQ]
This
 sqrtInvLock.pdf 
  9792   Wed Apr 9 16:08:33 2014 JenneUpdateLSCCARM loop gains vs. CARM offsetI have taken EricQ's simulation results
for the CARM plant change vs.  CARM offset,
and put that together with the CM and CARM
 8x 
  9791   Wed Apr 9 02:34:20 2014 JenneUpdateLSCJumping over the CARM resonance pointKoji was right, and I was using much too
large of a CARM offset. 
 TRX_TRY_QPDonly.pngLSC_error_signals.pngPRM_SUSangles.pngREFL1f_AS55.png 
  9790   Tue Apr 8 23:04:14 2014 manasaUpdateLSCarm length measurements

    

       
            
  
  9789   Tue Apr 8 19:10:39 2014 ranaUpdateLSCarm length measurements Since we don't have an arm length
precision measurement (i.e. better than centimeters),
why not just do as Koji suggests and use
  
  9788   Tue Apr 8 10:44:53 2014 KojiUpdateLSCPlaying with PRMI + 2 armsI vaguely remember that the ALS count (Phase
Tracker output) is converted to Hz@532nm
by a factor  ~20kHz/cnt.
  
  9787   Tue Apr 8 01:58:53 2014 JenneUpdateLSCPlaying with PRMI + 2 armsI played around with the PRMI + 2 arms
situation again this evening.  (I'm
not ready to call it "PRFPMI" until
  
  9786   Mon Apr 7 15:26:32 2014 jamie, ericqUpdateCDSaborted attempt to update c1sus machine with second CPUThis morning we attempted to replace the
c1sus front end machine with a spare that
had been given a second CPU, and therefore
 Screenshot-Untitled_Window.png 
  9785   Fri Apr 4 18:51:29 2014 ericqSummaryLSCMORE CARM related modelingIn today's ISC call, Kiwamu was comparing
two ways to approach resonance: 

    "C-Type": The
 9x 
  9784   Thu Apr 3 18:55:10 2014 ericqSummaryLSCSome CARM related modeling The other day, Jenne and I were comparing
my MIST simulation to her Optickle simulation
for the CARM transfer functions I posted
 asIsPRCRes.pdfidealPRCRes.pdf3fPrclAnglesCarm.pdf 
  9783   Thu Apr 3 18:09:54 2014 ericqUpdateLSCAttempt at PRMI+2 armsSo, here's the basic: "We reduced
the CARM offset and saw more TRY" plot. 
 offsetTRY.pdf2dhist.pdfpdh_trans.pdf 
  9782   Thu Apr 3 17:05:52 2014 SteveUpdateVACMaglev controller swapped

    

       
            
 loanerControllerIn.png 
  9781   Thu Apr 3 03:06:34 2014 JenneUpdateLSCAttempt at PRMI+2 arms[EricQ, Jenne]
Much more success later! 
We've had the arms locked on ALS
  
  9780   Thu Apr 3 00:30:52 2014 JenneUpdateLSCAttempt at PRMI+2 arms[EricQ, Jenne]
We started out this evening by
locking the PRMI, on different REFL PDs,
  
  9779   Wed Apr 2 23:08:51 2014 KojiSummaryASCNew PRM ASC is runningThe new PRM ASC design

Pitch
FM1: zero at 0Hz, pole at 2000Hz,
 PRM_QPD.pdfQPD_spe.pdf 
  9778   Wed Apr 2 20:13:04 2014 JenneUpdatePEMMore Chile EQs2 more earthquakes in Chile:  a M6.4
and a M7.8. 
We got them about 15 minutes ago
  
  9777   Wed Apr 2 19:50:12 2014 KojiSummaryASCNew PRM ASC is runningAs the designed ASC filters in this
entry had too little phase margins (~10deg),
I had to compromise the servo design.
  
  9776   Wed Apr 2 16:34:15 2014 SteveUpdateVACMaglev controller needs service

    

       
            
  
  9775   Wed Apr 2 09:31:22 2014 SteveUpdatePEMlocal 3.0M earthquake

    

       
            
 local3.0Meq.png8.2MegChili?.png 
  9774   Wed Apr 2 01:18:30 2014 JenneUpdateLSCAttempt at PRMI+2 armsI was trying to lock PRMI+2 arms, but I'm
losing patience with the MC losing lock. 
It's mostly well-behaved, but every now and
  
  9773   Tue Apr 1 22:03:44 2014 KojiSummaryASCNew PRM ASC is running[Koji Jenne]
New PRM ASC was implemented. [to
be cnt'd]
  
  9772   Tue Apr 1 21:45:01 2014 JenneSummaryLSCPRM violin notch not at correct freq?Koji and I have the PRMI locked right now,
and we hear a very strong violin mode ringing
up, at 628Hz.  This is, according to
  
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