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ID Date Author Type Categoryup Subject Text Attachments
  9606   Wed Feb 5 20:41:57 2014 DenUpdateLSCcalibrated spetra from OAF testWe did online adaptive filtering test with
IMC and arms 1 year ago (log
7771). In the 40m presentations I can
 oaf_cal.pdf 
  9614   Sat Feb 8 15:14:18 2014 ericqUpdateLSCPRM Sideband Splitting[ericq]
Today, I kicked the PRM to see the
sideband splitting in POP110. 
 PRCpeaks.pdf 
  9626   Wed Feb 12 11:57:55 2014 JenneUpdateLSCMusings on RFPDs[Rana, Jenne, Manasa]
We looked at the I vs. Q separation
in several of the Refl PDs, while driving
  
  9630   Wed Feb 12 19:47:40 2014 JenneUpdateLSCCalibrated REFL signalsI calibrated the REFL signals to meters
from counts.  The I-phase signals all
line up very nicely, but the Q-phase signals
 CalibratedUsingPRMdrive.pdf 
  9631   Wed Feb 12 20:30:41 2014 KojiUpdateLSCCalibrated REFL signalsWe usually want to remove PRCL from the
Q quadrature for each PD. 
Therefore, you are not supposed to
  
  9634   Thu Feb 13 19:36:36 2014 KojiSummaryLSCPRM 2nd/4th violin filter addedJenne and I noticed high pitch sound from
our acoustic interferometer noise diagnostic
system.
  
  9635   Thu Feb 13 22:27:54 2014 JenneUpdateLSCPRMI locked on REFL 33 I&Q[Jenne, Koji]
I was able to get the PRMI locked
on REFL33 I&Q, but it wasn't overly stable,
  
  9636   Fri Feb 14 00:58:41 2014 JenneUpdateLSCThoughts on Transition to IR[Koji, Jenne, EricQ, Manasa]
We
 Screenshot-Untitled_Window-1.png 
  9641   Sun Feb 16 17:40:11 2014 KojiUpdateLSCFriday Night ALSI wanted to try common/differential ALS
Friday evening. I tried ALS using the LSC
servo but this was not successfull.
  
  9646   Tue Feb 18 18:52:08 2014 JenneUpdateLSCALS not locking with LSC Koji mentioned to me (and elogged) that
he was unsuccessful locking the ALS using
the LSC servos.  He suggested I look
 ALSX_POXvsBeatnote.pdfALSY_POYvsBeatnote.pdfBeatNoteSpectra_ArmsLockedWithIR_28Feb2014.pdfALSvsLSC_LockingFilters.pdf 
  9647   Tue Feb 18 20:31:29 2014 KojiUpdateLSCALS not locking with LSC Hmm. Wierd. Can you look at the TFs between
ETMX-EXC and the error signals so that we
can identify which one has these structures.
  
  9648   Tue Feb 18 23:27:14 2014 JenneUpdateLSCALS not locking with LSC It looks like its somehow a discrepancy
between the TFs of each error signal, because
features are similar, and present, in both
 ALSX_POXvsBeatnote_withEXCtfs.pdf 
  9649   Tue Feb 18 23:55:33 2014 JenneUpdateLSCALS locked with LSC!I'm really excited, so I'm posting this,
even though I'm still working:
  
  9650   Wed Feb 19 00:35:23 2014 KojiUpdateLSCALS locked with LSC!Great. I indeed disabled all of the triggers
and the normalization during my trial but
in vain.
  
  9651   Wed Feb 19 01:33:03 2014 JenneUpdateLSCALS locked with LSC!I am also not able to lock the ALS using
the 'regular' LSC filters.  To figure
out what filters were doing what, I made
 ALS_XARM_LockingFilters.pdfALSvsLSC_AllLockingFilters.pdfLSC_XARM_LockingFilters.pdf 
  9652   Wed Feb 19 03:07:22 2014 JenneUpdateLSCALS locked with LSC!No more progress tonight. 
I am still unable to lock the ALS using the
regular LSC filters.  I went back to
  
  9654   Wed Feb 19 11:00:16 2014 ericqUpdateLSCSome Simulation Efforts Q EDIT: THIS
IS WRONG. I LOCKED PRC ON THE CARRIER
 As
Koji measured the other day: MICH and
 PRMISensingAsIs.pdfPRMISensingCoinc.pdfMICHvPRCLangle.pdfArmLengthChoice.pdf 
  9655   Wed Feb 19 11:45:12 2014 JenneUpdateLSCScripts for ALS being modifiedWe
need to change several scripts for use with
the new ALS-in-the-LSC paradigm:
  
  9656   Wed Feb 19 14:14:46 2014 ericqUpdateLSCSome Simulation Efforts Q EDIT: THIS
IS WRONG. I LOCKED PRC ON THE CARRIER
Koji
noted oddities in the sensing matrix results
 PRMISensingAsIs.pdfPRMISensingCoinc.pdfMICHvPRCLangle.pdf 
  9657   Wed Feb 19 16:42:08 2014 ericqUpdateLSCSome Simulation EffortsDisregard previous
ELOGs, I had the PRC locked on carrier 
 SBLOCK_PRMISensingAsIs.pdfSBLOCK_MICHvPRCLangle.pdf 
  9658   Wed Feb 19 18:21:33 2014 manasaUpdateLSCScripts for ALS modified

    

       
            
  
  9659   Wed Feb 19 22:47:26 2014 JenneUpdateLSCALS locked using LSC model, Common & Diff transitioned to IR transmission signals[Jenne, Koji, Manasa, EricQ]
Today
we successfully locked the ALS using the
 common_diff_ALS.pdfALS_newVSoldBoosts.pdf 
  9660   Fri Feb 21 12:45:57 2014 ericqUpdateLSCEquivalent Displacement Noise from QPD Dark Noise in SQRTINVEQ UPDATE: Measured it wrong the first
time, fixed now.
I measured the spectra of the SQRTINV
 SQRTINVspectra.pdfSQRTINV_DarkNoise.pdf 
  9668   Tue Feb 25 00:00:01 2014 rana, jenneUpdateLSCreasons that the REFL signals may be degenerate nowWe're exploring some effects which may
give some funny macroscopic detuning and
cause a near phase degeneracy in the REFL
  
  9669   Tue Feb 25 02:46:38 2014 rana, jenneUpdateLSCChanging PRCL offset changes REFL 165 degeneracy[Jenne, Rana]
We put offsets in the PRCL and MICH
loops, and measured sensing matrices for
 PRC_offsetCheck_24Feb2014.pdf 
  9670   Tue Feb 25 14:48:49 2014 ericqUpdateLSCChanging PRCL offset changes REFL 165 degeneracyAfter speaking with Jenne and Gabriele,
I did a little bit of simulating based on
my earlier code that looked at the angle
 MICHvPRCLangle_wOffset.pdfSBprclPeaks.pdf 
  9671   Tue Feb 25 16:07:33 2014 ericqUpdateLSCChanging PRCL offset changes REFL 165 degeneracy And glossing over the MICH offset,
here's the PRC offset plots in displacement,
rather than radians.
 MICHvPRCLangle_wOffset.pdfMICHvPRCLangle_wOffset_fullscale.pdf 
  9673   Tue Feb 25 17:27:41 2014 JenneUpdateLSCREFL signals calibratedI have recalibrated the REFL signals.
I first adjusted the demod phases
until the I-signals lined up with the I-phase
 SensMat_25Feb2014.pngCalibrated_25Feb2014.pdf 
  9674   Tue Feb 25 18:16:22 2014 JenneSummaryLSCEven more violin filtersA new violin mode at 1303 Hz was ringing
up this afternoon.  Rana and I added
a notch for this.
 PRMvio2.png 
  9676   Wed Feb 26 01:49:08 2014 JenneUpdateLSCChanging PRCL offset changes REFL 165 degeneracyI have measured the sensing matrix at a
variety of PRCL offset values.
 DemodPhaseSeparation.pdfPOP_AS_PDvalues.pdf 
  9685   Mon Mar 3 17:35:10 2014 KojiUpdateLSCVarious demod phase measurementI wanted to check how the refl signals
looked like. 
I decided to measure the demod phase
  
  9687   Mon Mar 3 22:21:43 2014 KojiSummaryLSCPRMIsb locked with REFL165I&QSuccessful
PRMIsb locking with REFL165I/Q
My
  
  9688   Mon Mar 3 23:16:06 2014 ranaUpdateLSCY Arm Loop Shape found to be weird: changed now I was getting the Y Arm ready for
Eric Q's loss measurements and so I looked
at the noise and loop shape. The loop shape
 Yarm_sweep_140303.pdfYarm_sweep_140303b.pdfyarm.pdf 
  9691   Wed Mar 5 11:33:10 2014 KojiSummaryLSC2 arm ALS->LSC transition - road mapStep by step description of transition
from 2arm ALS to Common/Differential LSC
for FPMI
  
  9692   Wed Mar 5 16:27:51 2014 ericqUpdateLSCPreliminary Arm Loss MeasurementsI measured the arm cavity losses as Kiwamu
did way back in ELOG
5074.
 Yarm.pdf 
  9693   Wed Mar 5 18:04:36 2014 ericqUpdateLSCEquivalent Displacement Noise from QPD Dark Noise in SQRTINVAt today's meeting, it was suspected that
these noise levels were far too low. (ELOG
 calc1.jpgcalc2.jpgSQRTINVspectra.dat.zipdarkTransmonSpec.py 
  9694   Wed Mar 5 19:15:39 2014 JenneSummaryLSCALS offset moving script modified

    

       
            
  
  9696   Wed Mar 5 22:32:21 2014 manasaUpdateLSCStuck at step 2

    

       
            
  
  9698   Thu Mar 6 11:15:32 2014 KojiSummaryLSCStuck at step 2You don't need to make transition from
ALS X/Y to ALS C/D. Just stabilize the arms
with ALS C/D from the beginning.
  
  9702   Fri Mar 7 00:43:34 2014 manasaUpdateLSCALS C&D locked (on MC2 and ETMs) and IR resonance obtained[EricQ, Manasa]

 ALS_MC2CARM.pdf 
  9708   Mon Mar 10 21:12:30 2014 KojiSummaryLSCComposite Error Signal for ARms (1)The ALS error (i.e. phase tracker output)
is linear everywhere, but noisy. 
The 1/sqrt(TR) is linear and less
 composite_linear_signal.nb.zip 
  9709   Mon Mar 10 21:13:43 2014 nicolasSummaryLSC Composite Error Signal for ARms (2)In order to better understand how the composite
signal would behave in the presence of noise,
I decided to do a simple analysis of the
 rawsigs.pngerrorsigs.pngoptimalweights.pngcompositenoise.png 
  9710   Mon Mar 10 21:14:58 2014 ericqSummaryLSCComposite Error Signal for ARms (3)Using Koji's mathematica notebook, and
Nic's python work, I set out to run a time
domain simulation of the error signal, with
 model.pngsimSweep.pdfalsSweep.pdf 
  9711   Mon Mar 10 21:16:13 2014 KojiSummaryLSCComposite Error Signal for ARms (4) The LSC model was modified for CESAR.
A block called ALSX_COMBINE was made
in the LSC block. This block receives the
 ss1.pngss2.pngCESAR_OFFSETS.pdf 
  9712   Mon Mar 10 21:16:56 2014 KojiSummaryLSCComposite Error Signal for ARms (5) After making the CDS modification, CESAR
was tested with ALS.
First of all, we run CESAR with threshold
  
  9713   Tue Mar 11 14:49:01 2014 KojiSummaryLSCImportant notice on the XARM servoThe nominal gain
of the XARM for the POX11 error signal is
  
  9715   Tue Mar 11 15:14:34 2014 denSummaryLSCComposite Error Signal for ARms (1)

    

       
            
  
  9717   Tue Mar 11 15:21:08 2014 KojiSummaryLSCComposite Error Signal for ARms (1)True. But we first want to realize this
for a single arm, then move onto the two
arms case. 
  
  9718   Tue Mar 11 18:33:21 2014 KojiUpdateLSCComposite Error Signal for ARms (6) Today we modified the CESAR block.
- Now the sign(X) function is in
a block.
 14.png 
  9719   Tue Mar 11 18:34:11 2014 JenneUpdateLSCComposite Error Signal for ARms (7)[Nic, Jenne, EricQ, and Koji]
We
have used CESAR successfully to bring the
 spectra-ungarble.pdfScreenshot-1.pngScanFromOffToOnResonance.pdfScanThroughResonance.pdf 
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