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ID Date Author Type Categoryup Subject Text Attachments
  8213   Sat Mar 2 14:52:02 2013 ranaUpdateLSCstable lock of PRMI  Whereas
the sensing matrix coefficients for ITMX/ITMY
  
  8215   Sun Mar 3 22:16:46 2013 JenneUpdateLSCLSC whitening triggering started[Jenne, Annalisa]
We have started working on writing
the c-code to parse the LSC input matrix,
  
  8217   Mon Mar 4 09:55:33 2013 ranaUpdateLSCLSC whitening triggering started  How about posting a logic flow
diagram? Is the idea to trigger only on the
power signals to determine the lock state?
  
  8230   Tue Mar 5 06:27:14 2013 yutaUpdateLSCintra-cavity power dependence on mirror misalignmentI measured intra-cavity power dependance
on mirror misalignment.
Intra-cavity
 PRM_PIT_20130305a.pngPRM_YAW_20130305b.pngITMX_YAW_20130305.pngITMY_YAW_20130305.png 
  8234   Tue Mar 5 18:36:27 2013 JenneUpdateLSCLSC whitening triggering startedMore effort at debugging the LSC whitening. 
Today I tried moving things over
to the c1tst model, which runs on the y-end
  
  8235   Tue Mar 5 23:00:08 2013 yutaUpdateLSCYarm and PRC g-factor from misalignment measurementI fitted intra-cavity power dependance
on mirror misalignment plot with parabola
to get the g-factor.
 ITMY_YAW_20130305_DC.pngPRM_PIT_20130305a_DC.pngPRM_YAW_20130305b_DC.png 
  8237   Wed Mar 6 02:46:20 2013 ManasaUpdateLSCPRMI locking for g-factor measurement [Yuta, Manasa]
PRMI alignment procedure for carrier
 locking has been kept the same except that
 POPDCspec_PRMIlocked.png 
  8239   Wed Mar 6 09:44:29 2013 KojiUpdateLSCPRMI locking for g-factor measurement- What about normalizing POPDC to indicate
the carrier recycling gain?
- When you align the PMC, confirm
  
  8242   Wed Mar 6 18:14:33 2013 ManasaSummaryLSCCalibration of BS, ITMX and ITMY actuators[Yuta, Manasa]

Measured
 MICHerrCalibration.pngMICHerrCalibration.pngMICHOLTF.pngactcalibITMBS.png 
  8248   Thu Mar 7 01:43:35 2013 yutaUpdateLSCcalibrated MI differential length spectraFree swing MI differential length is 86 nm
RMS and residual length when locked
 LSCMICHOLTF_MI.pngMImotion.png 
  8255   Fri Mar 8 02:17:04 2013 yutaUpdateLSCcalibration of PRM actuator[Manasa, Yuta]

We measured AC response of PRM actuator
 calibREFL55Q.pngactcalibPRM.pngOLTF_PRCL.png 
  8256   Fri Mar 8 03:07:19 2013 yutaUpdateLSCcalibrated PRM-ITMY length spectraMeasured free swing PRM-ITMY length was
230
nm RMS.
 LSCPRCLOLTF_PRITMY.pngPRITMYmotion.png 
  8332   Fri Mar 22 19:46:29 2013 KojiSummaryLSCDiode impedance test resultI've tested Perkin-Elmer InGaAs PDs at
OMC Lab.
- The diode impedances were measured
  
  8375   Fri Mar 29 19:23:49 2013 Gabriele, JenneFrogsLSCAnalog whitening filter of REFL55 not switchingWe discovered that the analog whitening
filter of the REFL55_I board is not switching
when we operate the button on the user interface.
  
  8376   Fri Mar 29 19:56:02 2013 GabrieleMetaphysicsLSCLock of PRMI on sidebandsI finally managed to get long stretches
of PRMI lock, up to many minutes. The lock
is not yest very stable, it seems to me that
 lock_prmi5.pdflock_prmi6.pdflock_prmi7.pdfoscillation.pdflock_prmi8.pdf 
  8377   Fri Mar 29 19:58:24 2013 Gabriele, JenneFrogsLSCAnalog whitening filter of REFL55 not switching

    

       
            
  
  8378   Sun Mar 31 17:26:32 2013 ranaUpdateLSCLock of PRMI on sidebands 
 Our first move has to be fixing
the whitening switching for REFL55. That's
  
  8379   Mon Apr 1 09:05:09 2013 Jenne, GabrieleConfigurationLSCPOP22 configurationOn Friday we modified the POP22 set up:
now the PD output goes to a bias tee. The
DC output goes to the ADC board, while the
  
  8380   Mon Apr 1 09:25:35 2013 JenneMetaphysicsLSCLock of PRMI on sidebands[Gabriele, Jenne]
I put a notch in FM10 for both MICH
and PRCL at 628Hz, to try to prevent us from
  
  8383   Mon Apr 1 16:24:09 2013 JamieFrogsLSCPD whitening switching fixed (loose connection at break-out box)

    

       
            
 20130401_161858.jpg20130401_161917.jpg 
  8387   Tue Apr 2 10:22:37 2013 Rana, Gabriele, JenneUpdateLSCPRMI lockWe locked the PRMI, this time really on
the sidebands, using the two REFL55 signals.
Here are the parameters: triggering
 lock_prmi_sb.pdf 
  8388   Tue Apr 2 11:08:16 2013 KojiUpdateLSCPRMI lock> The two REFL55 signals
Wow! It's a good news.
I think this is our first ever lock
  
  8397   Tue Apr 2 23:14:02 2013 ranaUpdateLSC22/110MHz path for POP

    

       
            
  
  8401   Wed Apr 3 14:46:17 2013 GabrieleSummaryLSCError signal simulation in PRMIHere is a summary of a simulation of the
error signal behavior in the PRMI configuration.
The main parameters are: 
 14x 
  8411   Thu Apr 4 10:12:55 2013 GabrieleSummaryLSCPOP22 and POP110I had a look at the POP110 signal, with
the PRMI flashing.
1) The LSCoffset script does not
 pop110_2.pdf 
  8412   Thu Apr 4 10:32:42 2013 GabrieleSummaryLSCREFL55 error signalsThe attached plot shows that also the behaviour
of the REFL11 and 55 signals is qualitatively
equal to the simulation outcome.
 prmi_refl_signals.pdf 
  8413   Thu Apr 4 10:46:54 2013 KojiSummaryLSCREFL55 error signalsBeautiful double peaks. I don't see the
triple zero-crossings. Is this because you
adjusted the phase correctly (as predicted)?
  
  8462   Thu Apr 18 19:54:11 2013 JenneUpdateLSCLSC whitening triggering workingI have implemented automatic triggered
switching of the analog whitening (and digital
dewhitening). 
 LSC_FM_Trig.pngRF_PD_block.pngLSC_triggers.pngLSC_SigCond.png 
  8491   Thu Apr 25 10:19:10 2013 KojiSummaryLSCLocking activity on Apr 24thLast night I worked on the several locking
configurations:
  
  8498   Fri Apr 26 20:43:51 2013 JenneUpdateLSCRemeasuring the Schnupp asymmetry[Jenne, Annalisa, with guidance from Koji]
We took data to remeasure the
Schnupp asymmetry, using the Valera method
  
  8500   Sat Apr 27 00:21:06 2013 KojiUpdateLSCLocking activity on Apr 26thWhen I talked with Den via phone, he recommended
to use the trigger and normalization with
POP110I.
 Screenshot.png 
  8501   Sat Apr 27 00:29:40 2013 KojiUpdateLSCLSCoffset script fixedPrior to the locking trials...
scripts/LSC/LSCoffset script
  
  8508   Mon Apr 29 22:13:41 2013 KojiUpdateLSCLocking with ASDCToday the locking was not as easy as that
was last Friday.
So I tried something new. Today Rana
 Screenshot.png 
  8509   Mon Apr 29 23:02:48 2013 KojiConfigurationLSCQuestonsQ. How much Schnupp asymmetry we want in
order to improve the signal ratio between
PRCL/MICH in REFL ports?
  
  8516   Tue Apr 30 23:17:25 2013 JenneUpdateLSCPRCL LSC filters copied to CARM bank temporarilyKoji is working on PRMI locking with different
photodiodes, and rather than typing different
numbers into the input matrix, it is more
  
  8517   Wed May 1 00:05:03 2013 KojiUpdateLSCMore stable lock of PRMI (REF33I and AS55Q)[Jenne Koji]
- Today the spots were moving more
than the usual. The OPLEV screens showed
 Screenshot.png 
  8518   Wed May 1 10:42:35 2013 SteveUpdateLSCcleanup  
 Optics from the car were placed
into glass door cabinet E0
  
  8519   Wed May 1 14:42:45 2013 JenneUpdateLSCPOP now has lens in front of PD

    

       
            
  
  8521   Thu May 2 00:34:57 2013 KojiUpdateLSClocking- Routine alignment
Locked the arm cavties. Ran ASS.
As this was not enough precise alignment
 Screenshot.pngScreenshot2.pngScreenshot3.png 
  8528   Fri May 3 17:32:59 2013 JenneUpdateLSCRemeasuring the Schnupp asymmetryI have looked at / analyzed the Schnupp
data that Annalisa and I took last week,
as well as some more Yarm data that I took
 Xarm_SchnuppData_April2013.pngYarm_SchnuppData_April2013.png 
  8537   Tue May 7 16:21:01 2013 JenneSummaryLSCError signal simulation in PRMII asked Gabriele why it looked like for
the PRCL sweep REFL 55 I&Q were zero
at zero, but for the MICH sweep only REFL55
 8x 
  8553   Wed May 8 19:31:17 2013 JamieConfigurationLSCLSC: added new SQRT_SWITCH to power normalization DOF outputsThis removes the old sqrt'ing from the
inputs to the POW_NORM matrix (was only on
the POP110 I/Q) and moves it to the DOF outputs. 
  
  8555   Thu May 9 00:05:12 2013 rana, Koji, JenneSummaryLSCAA and AI changeWe would
like to increase the UGF of the PRC loop
 AAAI.pdf 
  8566   Mon May 13 23:05:26 2013 KojiConfigurationLSCPRMI locking- Disabled MCL path in mcdown/mcupscript.
Nominal gain in mcdown/mcup was -50
and -100 respectively.
 130513_PRC_ASC.pdf130513_PRC_ASC_servo.pdf 
  8574   Tue May 14 20:27:19 2013 KojiConfigurationLSCOpenloop gain for PRMI lock May 13The OLTFs for PRCL and MICH for the last
night's lock were modelled using Yuta's python
script.
 LSCPRCLOLTF.pngLSCMICHOLTF.png130513.zip 
  8577   Wed May 15 00:45:28 2013 ranaConfigurationLSCOpenloop gain for PRMI lock May 13 
 Pfft.
  
  8589   Thu May 16 04:46:37 2013 JenneUpdateLSCKiwamu's sensing matrix measurement script revivedKiwamu had an old set of scripts for
measuring
the sensing matrices, but they were
  
  8592   Thu May 16 22:03:16 2013 KojiConfigurationLSCY Green BBPD returned to the PSL tableI borrowed the GTRY BBPD  for the
REFL165 trial before.
Now the PD is back on the PSL table.
  
  8593   Thu May 16 23:48:39 2013 JenneUpdateLSCKiwamu's sensing matrix measurement script revivedKoji locked the PRMI for me, and I took
some data.  I haven't finished figuring
out what to do with it / writing a processing
  
  8600   Mon May 20 17:49:36 2013 JenneUpdateLSCPRMI sensing matrix - not high quality dataJust so we have some numbers, I did a by-hand
analysis of the PRMI sensing matrix numbers
I posted here in the elog the other day. 
 PRMIsensMatQuickAnalysis.m.gz 
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