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ID Date Author Type Categoryup Subject Text Attachments
  9491   Wed Dec 18 18:45:39 2013 JenneUpdateLSCREFL 165 demod phasesI checked out the REFL165 demod phase,
and it looks like it was okay.  it was
-20.9 degrees.  I turned on my sensing
  
  9492   Thu Dec 19 03:29:34 2013 DenUpdateLSCCM servo test using yarm is completeKoji, Den
Procedure:

    lock yarm on IR, wire
 EOM.png 
  9493   Thu Dec 19 12:51:57 2013 JenneSummaryLSCEstimate of the sign of the PRC length errorMy hunch is that the PRC is SHORT
by a few cm, not long. 
In my Optickle simulation, the sidebands
 DesignLength.pngPlus5cm.pngMinus5cm.png 
  9495   Thu Dec 19 18:33:25 2013 GabrieleSummaryLSCEstimate of the sign of the PRC length errorMaybe I'm getting confused,
but I still believe there is no way to decide
the direction from yesterday's measurement.
  
  9499   Fri Dec 20 01:24:11 2013 DenUpdateLSChigh bandwidth loop achieved for yarmKoji, Den
CM Servo with
 CM_OL_meas.pdfcm_ol_sim.pdfCM_slow_fast_cross.pdf 
  9500   Fri Dec 20 03:31:07 2013 KojiUpdateLSClock acquisition path for the CM servoup/down scripts are to be made
(Offset Edit on Dec 20 10:38PM)

Configuration: 
  
  9501   Fri Dec 20 03:34:40 2013 KojiUpdateLSChigh bandwidth loop achieved for yarmThis
too huge offset difference with/without "BOOST"
switch should be checked.
  
  9507   Fri Dec 20 22:45:02 2013 KojiUpdateLSChigh bandwidth loop achieved for yarmI checked the offset situation in the CM
servo boost circuit. 
- The offset voltage on the CM servo
  
  9509   Sat Dec 21 01:54:04 2013 KojiConfigurationLSCLSC Whitening for the DCPDs/CM servo replacedThe previous LSC whitening filters for
the DCPDs were in an unknown state (although
the transfer functions were actually measured
  
  9523   Mon Jan 6 22:11:46 2014 JenneUpdateLSCPRCL sideband locking still not so happy 
 The PRCL once again doesn't
want to lock on sidebands for me.  I
  
  9537   Wed Jan 8 13:01:48 2014 GabrieleSummaryLSCEffect of PRC length mismatch on error signalsI
ran a simulation of a double cavity with
a PRC length mismatched w.r.t. the modulation
 REFL_vs_PRClength.pdf 
  9539   Wed Jan 8 16:08:52 2014 ericqSummaryLSCEffect of PRC length mismatch on error signals [ericq,Gabriele]
So, we want an relatively quick measurement
of the PRC length error (with sign!) at the
 phaseVlength.pdf 
  9541   Wed Jan 8 19:05:30 2014 GabrieleSummaryLSCEffect of PRC length mismatch on error signals [Gabriele,
EricQ]
 
 as11.pngas55.png 
  9544   Thu Jan 9 17:58:31 2014 ericqSummaryLSCEffect of PRC length mismatch on error signals[ericq, Gabriele, Manasa]
 We wanted to perform the PRC
length measurement today with an AS11 signal,
  
  9546   Fri Jan 10 15:31:07 2014 ranaSummaryLSCEffect of PRC length mismatch on error signals 
 Its very doubtful that the
MC yaw drift matters for the IFO. That's
  
  9548   Sun Jan 12 09:57:24 2014 GabrieleSummaryLSCEffect of PRC length mismatch on error signals

    

       
            
  
  9551   Mon Jan 13 19:31:04 2014 GabrieleSummaryLSCPRMI locking[Gabriele, EricQ]
We wanted to try the PRC length measurement,but
we ended up spending all the afternoon to
  
  9554   Tue Jan 14 19:05:48 2014 GabrieleSummaryLSCPRMI locked on sideband[Gabriele, EricQ] 
Finally, we managed to lock PRMI
on sidebands:
  
  9555   Tue Jan 14 19:10:51 2014 GabrieleSummaryLSCPRC length measurement [EricQ, Gabriele]
We could carry out the measurement
of PRC length. The AS110 photodiode was plugged
  
  9557   Wed Jan 15 18:18:15 2014 GabrieleSummaryLSCPRC length measurement analysis I analyzed the data we took yesterday,
both using AS11 and AS55. For each value
of the phase I estimated the Q/P ratio using
 experimental_data_as11.pdfexperimental_data_as55.pdfsimulation_phase_difference.pdf 
  9560   Thu Jan 16 21:38:13 2014 ericqUpdateLSCRepeat of PRC length measurement[ericq,Jenne]
Since we don't have agreement between
the measurements we made the other day and
  
  9561   Fri Jan 17 11:44:25 2014 GabrieleSummaryLSCMore length measurements, more confusion I analyzed the data taken yesterday. 
The AS11 data in PRMI configuration
is very bad, while the AS55 seems good enough:
 results_as11.pdfresults_as55.pdf 
  9564   Wed Jan 22 09:05:42 2014 GabrieleConfigurationLSCREFL11 back Yesterday night I plugged back the
REFL11 RF cable into the corresponding demodulation
board.
  
  9573   Fri Jan 24 12:44:25 2014 GabrieleHowToLSCProcedure to measure PRC lengthHere is how to measure the PRC length with
a set of distance measurements in the optical
setup. 
 8x 
  9574   Fri Jan 24 13:10:12 2014 JamieHowToLSCProcedure to measure PRC length

    

       
            
 path.pdf 
  9575   Sat Jan 25 21:09:16 2014 gabrieleHowToLSCProcedure to measure PRC lengthI know the drawing is wrong.
I put random distances, not realistic ones,
and I did not try to get something close
  
  9586   Wed Jan 29 21:01:03 2014 GabrieleSummaryLSCPRC length measurement analysis [Manasa,
EricQ, Gabriele]
We
 map.pdfscript.zip 
  9588   Thu Jan 30 19:00:25 2014 GabrieleSummaryLSCPRC length changed [Manasa,
EricQ, Gabriele]
Today
 map_jan30.pdfsurvey_v3_jan30.m 
  9590   Fri Jan 31 19:29:36 2014 GabrieleSummaryLSCPRC and SRC lengths Today we measured the missing distance
to reconstruct SRC length.
I also changed the way the mirror
 map_jan31st.pdfsurvey_v3.zip 
  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

    

       
            
  
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