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ID Date Author Type Category Subjectup Text Attachments
  9522   Mon Jan 6 20:52:09 2014 JenneUpdateIOOMC1/3 kicked this morning at 8:30When I got in this morning at 9-something
(9:45 maybe?), Steve was taking dust photos
on the AS table, of the MC Refl path. 
  
  5932   Thu Nov 17 22:24:19 2011 DenUpdateAdaptive FilteringMC1_COILAnalyzing coherence between MC length and
signals on MC1, MC2 and MC3 coils we have
noticed that MC1 COIL signal is not coherent
 MC1COIL-crop.pdfMC2COIL-crop.pdfMC3COIL-crop.pdf 
  5934   Thu Nov 17 23:44:48 2011 DenUpdateIOOMC1_SENSORWe've found that one of the  MC1_SENSORS
does not work properly.
See the figure.
 MCSENSORS.pdf 
  5935   Thu Nov 17 23:47:43 2011 DenUpdateIOOMC1_SENSORThe most interesting plot did not uploaded
in the previous elog.
Upload now local MC1_SENSOR signals.
 MC1SENSOR-crop.pdf 
  7453   Mon Oct 1 07:25:48 2012 SteveUpdateSUSMC2 & ETMX sus damping restored    
  11447   Mon Jul 27 16:47:53 2015 ericqUpdateIOOMC2 -> MCL Actuator TFOur noise cancellation SURFS will be doing
online subtraction on the mode cleaner length,
among other things. 
 mc2_2_mcl.pngMC2_2_MCL_TF.txt.zip 
  11539   Fri Aug 28 20:15:49 2015 ranaUpdateIOOMC2 -> MCL Actuator TF


  
  11548   Mon Aug 31 07:49:11 2015 ericqUpdateIOOMC2 -> MCL Actuator TF


  
  11462   Thu Jul 30 02:06:20 2015 IgnacioUpdateIOOMC2 <-> MCL Actuator TF fittedEric downloaded MC2 to MCL transfer function
data (H) as well as its inverse, MCL to MC2
(Hinv). He also downloaded new MCL and MC2
 TF_BODE.pngMC2_2_MCL.pngTF_INV_BODE.pngMCL_2_MC2.png 
  12996   Wed May 17 11:10:31 2017 SteveUpdateCamerasMC2 CCD video camera back in placeOlympus camera is removed and our old CCD
camera is back to monitor the face of MC2

  
  15048   Tue Nov 26 13:33:33 2019 YehonathanUpdateCamerasMC2 Camera rotated by 90 degreesMC2 analog camera was rotated by 90 degrees.
Orientation correctness was verified by exciting
the MC2 Yaw degree of freedom.
 MC2AnalogCameraAfter.jpgMC2AnalogCameraBefore.jpg 
  15982   Wed Mar 31 22:58:32 2021 Anchal, PacoUpdateSUSMC2 Coil Balancing TestA cross-coupling test has been set to trigger
at 05:00 am on April 1st, 2021. The script
is waiting on tmux session 'cB' on
  
  15984   Thu Apr 1 13:56:49 2021 Anchal, PacoUpdateSUSMC2 Coil Balancing Test ResultsThe coil balancing attempt failed. The
off-diagonal values in the measured sensing
matrices either remained the same or increased.
 SDistanceFromIdentity.pdfSmatIterations.pdfTestingExcitationAlongYAW.pdf 
  15985   Thu Apr 1 18:01:06 2021 Anchal, PacoUpdateSUSMC2 Coil Balancing Test Results Success??After fixing a few things we felt were
wrong in our implementation of the algorithm,
we ran the coil balancing for 12 iterations
 SDistanceFromIdentity.pdfSmatIterations.pdfMC2CoilCrossCoupling_opt.png 
  15987   Thu Apr 1 18:48:45 2021 gautamUpdateSUSMC2 Coil Balancing Test Results Success??In these results, can you also include
the new matrix and what the relative imbalances
were?
  
  15961   Thu Mar 25 11:46:31 2021 Paco, AnchalUpdateSUSMC2 Coil Balancing updatesProof-of-principle


We
excited PIT and YAW dofs using LOCKIN1 in
MC2 on Monday.
We
 CoilActuationBalancing.ipynb.tar.gzMC2_CoilBalancePITnorm_excSamePIT.pdfMC2_CoilBalanceYAWnorm_excSameYAW.pdf20210325_IMC_CoilBalance.tar.gz 
  15970   Fri Mar 26 11:54:37 2021 Paco, AnchalUpdateSUSMC2 Coil Balancing updates[Paco, Anchal]


Today
we spent the morning testing the scripts
  
  15972   Mon Mar 29 10:44:51 2021 Paco, AnchalUpdateSUSMC2 Coil Balancing updatesWe ran the coil balancing procedure 4 times
while iterating through the output matrix
optimization.
 MC2OutMatCrossCouple_Old-to-It3.pdf20210329_MC2_CrossCoupleTest.tar.gz 
  15974   Mon Mar 29 17:11:54 2021 gautamUpdateSUSMC2 Coil Balancing updatesFor this technique to work, (i) the WFS
loops must be well tuned and (ii) the beam
must be well centered on MC2. I am reasonably
  
  15975   Mon Mar 29 17:34:52 2021 ranaUpdateSUSMC2 Coil Balancing updatesI think there's been some mis-communication.
There's no updated Hang procedure, but
there is the one that Anchal, Paco and I
  
  16063   Wed Apr 21 11:38:27 2021 Anchal, PacoUpdateSUSMC2 Damping Gains OptimizedWe did a step response test with MC2 Suspensoin
Damping Gains and optimized them to get <5
oscillations in ringdown.
 MC2_DampGainStepTestWithNewGains.pngMC2_DampGainStepTestWithOldGains.png 
  16086   Mon Apr 26 18:55:39 2021 Anchal, PacoUpdateSUSMC2 F2A Filters TestedToday we tested the F2A filters created
from the DC gain values listed in 16066.


Filters:


For
 f2a.pdfIMC_F2A_Params_MC2.pdfMC2_F2A_FilterChar_POS2Ang.pdf 
  11711   Fri Oct 23 21:58:10 2015 ranaUpdateSUSMC2 F2P mis-tunedThe OSEMs cannot be used for coil balancing
above ~10 Hz. The main coupling path from
OSEM drive to sensor is not through the mirror
  
  11716   Tue Oct 27 03:46:26 2015 ericqUpdateSUSMC2 F2P mis-tunedD'oh. Good point.

Reverted for now; I'm thinking
about doing laser pointer->MC2 QPD...
  
  11702   Tue Oct 20 15:51:44 2015 ericqUpdateSUSMC2 F2P tunedUsing a modified version of Hang's
deMod_deCoup scripts, I tuned the MC2 coil
output matrix to minimize the appearance
  
  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
  
  5708   Thu Oct 20 01:40:33 2011 KojiSummarySUSMC2 Misaligned 2:27PM on WednesdayThere looks some activity at around
MC2 on Wednesday afternoon.
It
 MC2_misalign.png 
  5716   Thu Oct 20 18:57:35 2011 SureshSummarySUSMC2 Misaligned 2:27PM on Wednesday

    

       
            
  
  5717   Fri Oct 21 02:36:44 2011 SureshSummarySUSMC2 Misaligned 2:27PM on Wednesday : MC Realigned


   
        
            
  
  5718   Fri Oct 21 02:57:38 2011 SureshSummarySUSMC2 Misaligned 2:27PM on Wednesday : cause traced


   
        
            
  
  5719   Fri Oct 21 09:08:33 2011 steveUpdateSUSMC2 Misalignment Thinks to do before the NEXT realignment:
B,  tie 4 ancher bolts on table
legs to the floor
 mc2.jpg 
  17237   Mon Nov 7 19:53:12 2022 AnchalUpdateSUSMC2 OSEMs calibrated using MC_FMC2 OSEM outputs were calibrated today
using MC_F to get the output values in microns.
This was done using
  
  17240   Tue Nov 8 08:57:18 2022 ranaUpdateSUSMC2 OSEMs calibrated using MC_Fthis measurement is not valid because of
the coil to sensor coupling that I mentioned
before. This is why I suggested you make
  
  17245   Tue Nov 8 18:12:01 2022 AnchalUpdateSUSMC2 OSEMs calibrated using MC_FI reran this measurement at low frequency
0.1016 Hz. Following were the cts2um gain
changes:
  
  17248   Wed Nov 9 07:49:59 2022 ranaUpdateSUSMC2 OSEMs calibrated using MC_FIt would be good if you can post the uncertainties
with these measurements (and for generally
any measurements). This is so that we can
  
  17295   Mon Nov 21 18:33:05 2022 AnchalUpdateSUSMC2 OSEMs calibrated using MC_FRepeated this for MC2 using the error measurement
technique mentioned in 40m/17286
using this notebook.
  
  6549   Thu Apr 19 09:45:43 2012 SureshUpdateGeneralMC2 Oplev signals redirected for use in WFS servo

    

       
            
  
  12989   Fri May 12 18:45:04 2017 rebeccaUpdateCamerasMC2 Pics with OlympusRaw and JPG formats of the pictures are
saved on the Mac in the control room and
at this link:
  
  13066   Thu Jun 15 18:56:31 2017 jigyasaUpdateComputer Scripts / ProgramsMC2 Pitch-Yaw offsetA python
script to randomly vary the
MC2 pitch and yaw offset and correspondingly
  
  13073   Mon Jun 19 18:41:12 2017 jigyasaUpdateComputer Scripts / ProgramsMC2 Pitch-Yaw offsetThe previous run of the script had produced
some dubious results!

The script has been modified and
  
  13076   Tue Jun 20 17:44:12 2017 jigyasaUpdateComputer Scripts / ProgramsMC2 Pitch-Yaw offsetThe script didn't run properly last
night, due to an oversight of variable names!
It's been started again and has been
  
  13084   Tue Jun 27 18:47:49 2017 jigyasaUpdateComputer Scripts / ProgramsMC2 Pitch-Yaw offsetThe values generated from the script were
analyzed and a 3D scatter plot in addition
to a 2D map were plotted. 
  
  13087   Thu Jun 29 10:04:18 2017 jigyasaUpdateComputer Scripts / ProgramsMC2 Pitch-Yaw offsetThe script is being executed again, now.




  
  5905   Wed Nov 16 09:21:56 2011 SureshUpdateIOOMC2 Shifted in Pitch, corrected by adjusting the pitch bias[Steve, Suresh]
    Steve went over
to the MC2 walkway and 
  
  5910   Wed Nov 16 10:53:35 2011 SureshUpdateIOOMC2 Shifted in Pitch, corrected by adjusting the pitch bias


   
        
            
 C1IOO_MC_ALIGN.png 
  5913   Wed Nov 16 17:03:19 2011 KojiUpdateIOOMC2 Shifted in Pitch, corrected by adjusting the pitch biasMC was not locked for more than 5 hours
because of the misalignment.
Noticed that MC2 WFS feedback filters
  
  9884   Wed Apr 30 21:16:42 2014 ranaUpdateLSCMC2 Strad   bettsreplica.jpgMC_Y_vio.pdfMC2_vio.pdf 
  16066   Wed Apr 21 15:50:01 2021 Anchal, PacoUpdateSUSMC2 Suspension Optimization summary
MC2
Coil Balancing DC and AC Gains


  
  16067   Wed Apr 21 18:49:29 2021 ranaUpdateSUSMC2 Suspension Optimization summarythe
POS column should be all 1 for the AC balancing.
  
  16071   Thu Apr 22 08:50:21 2021 AnchalUpdateSUSMC2 Suspension Optimization summaryYes, during the AC balancing, POS column
was set to all 1. This table shows the final
values after all the steps. The first 3 columns
  
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