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Entry  Mon Mar 8 12:01:02 2021, Paco, Anchal, Summary, training, Investigate how-to XARM locking 
    Reply  Mon Mar 8 12:40:35 2021, gautam, Summary, training, Investigate how-to XARM locking 
    Reply  Mon Mar 8 19:22:56 2021, rana, Summary, SUS, IMC suspension characterization 
       Reply  Thu Mar 11 08:13:24 2021, Paco, Anchal, Update, SUS, IMC First Free Swing Test failed due to typo, restarting now 
          Reply  Tue Mar 16 19:13:09 2021, Paco, Anchal, Update, SUS, First success in Input Matric Diagonalization IMC_InputMatrixDiagonalization.pdfInMatCalcScripts.zip
             Reply  Wed Mar 17 11:57:54 2021, Paco, Anchal, Update, SUS, Tested New Input Matrix for MC1 20210317_MC1_InMATtest.pdfMC1_Input_Matrix_Test.tar.gz
                Reply  Wed Mar 17 16:30:46 2021, Anchal, Update, SUS, Normalized Input Matrices plotted better than SURF students IMC_InputMatrixDiagonalization.pdfNewAndOldMatrices.zip
                   Reply  Thu Mar 18 09:18:49 2021, Paco, Anchal, Update, SUS, Testing of new input matrices with new data MC_Optics_Kicked_Time_Series_1.pdfTEST_Input_Matrix_Diagonalization.pdf
                      Reply  Thu Mar 18 12:46:53 2021, rana, Update, SUS, Testing of new input matrices with new data 
                         Reply  Fri Mar 19 10:49:44 2021, Paco, Anchal, Update, SUS, Trying coil actuation balance 
                            Reply  Mon Mar 22 11:57:21 2021, Paco, Anchal, Update, SUS, Trying coil actuation balance 210322_MC1_ASCY.pdfNewandOldMatrices.tar.gz
                               Reply  Mon Mar 22 15:10:00 2021, rana, Update, SUS, Trying coil actuation balance 
                                  Reply  Mon Mar 22 19:07:50 2021, Paco, Anchal, Update, SUS, Trying coil actuation balance 8x
                                     Reply  Tue Mar 23 09:16:42 2021, Paco, Anchal, Update, Computers, Power cycled C1PSL; restored C1PSL MCWFS1and2PITYAW.pdfMCWFS1and2PITYAW_Zoomed.pdf
                                        Reply  Wed Mar 24 09:23:49 2021, Paco, Update, SUS, MC3 new Input Matrix 
                                           Reply  Thu Mar 25 11:46:31 2021, Paco, Anchal, Update, SUS, MC2 Coil Balancing updates CoilActuationBalancing.ipynb.tar.gzMC2_CoilBalancePITnorm_excSamePIT.pdfMC2_CoilBalanceYAWnorm_excSameYAW.pdf20210325_IMC_CoilBalance.tar.gz
                                              Reply  Thu Mar 25 15:31:24 2021, gautam, Update, IOO, WFS servos 
                                              Reply  Fri Mar 26 11:54:37 2021, Paco, Anchal, Update, SUS, MC2 Coil Balancing updates 
                                                 Reply  Mon Mar 29 10:44:51 2021, Paco, Anchal, Update, SUS, MC2 Coil Balancing updates MC2OutMatCrossCouple_Old-to-It3.pdf20210329_MC2_CrossCoupleTest.tar.gz
                                                    Reply  Mon Mar 29 17:11:54 2021, gautam, Update, SUS, MC2 Coil Balancing updates 
                                                       Reply  Mon Mar 29 17:34:52 2021, rana, Update, SUS, MC2 Coil Balancing updates 
                                                          Reply  Wed Mar 31 22:58:32 2021, Anchal, Paco, Update, SUS, MC2 Coil Balancing Test 
                                                             Reply  Thu Apr 1 13:56:49 2021, Anchal, Paco, Update, SUS, MC2 Coil Balancing Test Results SDistanceFromIdentity.pdfSmatIterations.pdfTestingExcitationAlongYAW.pdf
                                                                Reply  Thu Apr 1 18:01:06 2021, Anchal, Paco, Update, SUS, MC2 Coil Balancing Test Results Success?? SDistanceFromIdentity.pdfSmatIterations.pdfMC2CoilCrossCoupling_opt.png
                                                                   Reply  Thu Apr 1 18:48:45 2021, gautam, Update, SUS, MC2 Coil Balancing Test Results Success?? 
                                                                      Reply  Thu Apr 1 21:13:54 2021, Anchal, Update, SUS, Matrix results, new measurement set to trigger 
                                                                         Reply  Fri Apr 2 14:51:20 2021, Anchal, Update, SUS, Bug found, need to redo the balancing 
                                                                            Reply  Tue Apr 6 18:46:36 2021, Anchal, Paco, Update, SUS, Updates on recent efforts FirstMeasurementPlots.pdf
                                                                               Reply  Wed Apr 7 17:38:51 2021, Anchal, Update, SUS, Trying to uncouple only PIT and YAW first SDistanceFromIdentity.pdfSmatIterations.pdfTimeSeriesPlots.pdfCSDPlots.pdfSmatrixPlots.pdf
                                                                                  Reply  Thu Apr 8 17:04:43 2021, Anchal, Paco, Update, SUS, First Successful Coil Balancing SDistanceFromIdentity.pdfSmatIterations.pdfSmatrixPlots.pdf
                                                                                     Reply  Fri Apr 9 13:13:00 2021, Anchal, Paco, Update, SUS, Faster coil balancing SmatIterations.pdfMC2AllOutmat.txt
                                                                                        Reply  Fri Apr 9 17:41:12 2021, rana, Update, SUS, Faster coil balancing 
                                                                                           Reply  Mon Apr 12 10:07:35 2021, Anchal, Update, SUS, What's F2A?? 
                                                                                              Reply  Tue Apr 13 09:51:22 2021, rana, Update, SUS, What's F2A?? 
                                                                                                 Reply  Wed Apr 14 17:53:38 2021, Anchal, Update, SUS, Plan for calculating filter banks for output matrix aka F2A aka F2P MC2propF2A_UL.pdf
                                                                                                    Reply  Thu Apr 15 11:41:43 2021, Anchal, Update, SUS, Proposed filters for output matrix aka F2A aka F2P MC2propPOSfb.pdf
                                                                                                       Reply  Fri Apr 16 11:36:36 2021, Anchal, Paco, Update, SUS, Tested proposed filters for POS colum in MC2 output matrix 20210416_MC2DCcoilBalancingNoFilters.pdfuncFilters.pdf20210416_MC2DCcoilBalancingWithFilters.pdfuncFilters_v2.pdf20210416_MC2DCcoilBalancingWithFilters_v2.pdf
                                                                                                          Reply  Fri Apr 16 15:47:58 2021, rana, Update, SUS, Tested proposed filters for POS colum in MC2 output matrix 
                                                                                                             Reply  Mon Apr 19 12:18:19 2021, Anchal, Paco, Update, SUS, Tested proposed filters for POS colum in MC2 output matrix CrossCoupleTestForEgToCtFilters.pdfuncFilters.pdfuncFilters_v2.pdf
                                                                                                                Reply  Tue Apr 20 10:52:49 2021, Anchal, Paco, Update, SUS, AC gain coil output balancing for IMC POS2PYuncoupled.pdfPIT2PYuncoupled.pdfMC1YAWexc.pdfMC1PITexc.pdf
                                                                                                                   Reply  Tue Apr 20 18:19:30 2021, Anchal, Update, SUS, MC2 coil balanced at DC MC2_DC_Coil_Balanced_St.pngIMC_F2A_Params_MC2.pdfUploadedPOS_F2A_Filters.pdf
                                                                                                                      Reply  Wed Apr 21 11:38:27 2021, Anchal, Paco, Update, SUS, MC2 Damping Gains Optimized MC2_DampGainStepTestWithNewGains.pngMC2_DampGainStepTestWithOldGains.png
                                                                                                                         Reply  Wed Apr 21 15:50:01 2021, Anchal, Paco, Update, SUS, MC2 Suspension Optimization summary 
                                                                                                                            Reply  Wed Apr 21 18:49:29 2021, rana, Update, SUS, MC2 Suspension Optimization summary 
                                                                                                                               Reply  Thu Apr 22 08:50:21 2021, Anchal, Update, SUS, MC2 Suspension Optimization summary 
                                                                                                                            Reply  Mon Apr 26 18:55:39 2021, Anchal, Paco, Update, SUS, MC2 F2A Filters Tested f2a.pdfIMC_F2A_Params_MC2.pdfMC2_F2A_FilterChar_POS2Ang.pdf
                                                                                                                               Reply  Tue Apr 27 10:05:28 2021, Anchal, Paco, Update, SUS, MC1 and MC3 F2A Filters Tested IMC_F2A_Params_MC1.pdfMC1_POStoAng_CrossCoupling.pdfIMC_F2A_Params_MC3.pdfMC3_POStoAng_CrossCoupling.pdf
                                                                                                                                  Reply  Wed Apr 28 10:56:10 2021, Anchal, Paco, Update, SUS, IMC Filters diagnosed 7x
                                                                                                                                     Reply  Wed Apr 28 17:09:11 2021, Anchal, Update, SUS, Tuned Suspension Parameters uploaded for long term behavior monitoring 
                                                                                                                                     Reply  Thu Apr 29 10:52:56 2021, Anchal, Update, SUS, IMC Trans QPD and WFS loops step response test PIT_OFFSET_ON_MC2.pngYAW_STEP_ON_MC2_complete.png
                                                                                                                                        Reply  Thu Apr 29 18:53:33 2021, Anchal, Update, SUS, IMC Suspension Damping Gains Test MC1_SUSDampGainTest.pdfMC2_SUSDampGainTest.pdfMC3_SUSDampGainTest.pdf
                                                                                                                                           Reply  Mon May 3 16:24:14 2021, Anchal, Update, SUS, IMC Suspension Damping Gains Test Repeated with IMC unlocked MC1_SusDampGainTest.pdfMC2_SusDampGainTest.pdfMC3_SusDampGainTest.pdf
                                                                                                                                              Reply  Wed May 5 09:04:47 2021, Anchal, Update, SUS, New IMC Suspension Damping Gains uploaded for long term testing 
                                                                                                                                                 Reply  Wed May 12 11:45:13 2021, Anchal, Paco, Summary, SUS, New IMC Settings are miserable MC_F_Comparison.pdfMC_TRANS_QPD_Comparison.pdfIMC_REFL_DC_Comparison.pdf
                                                                                                                                                    Reply  Wed Jun 2 09:43:30 2021, Anchal, Paco, Summary, SUS, IMC Settings characterization seismicX.pdfseismicXtoMC_F_TFest.pdfseismicXtoMC_TRANS_PIT_TFest.pdfseismicXtoMC_TRANS_YAW_TFest.pdf
                                                                                                                                                       Reply  Wed Jun 2 16:20:59 2021, Anchal, Paco, Summary, SUS, IMC Suspension gains reverted to old values 
                                                                                                                                                 Reply  Sat May 15 14:54:24 2021, gautam, Update, SUS, IMC settings reverted MC2coilOut.png
                                                                                                                                                    Reply  Thu May 20 10:35:57 2021, Anchal, Update, SUS, IMC settings reverted 
                                                                                                                         Reply  Thu Apr 22 12:17:23 2021, Anchal, Paco, Update, SUS, MC1 and MC3 Suspension Optimization Summary 
                                                                                                                            Reply  Thu Apr 22 14:22:39 2021, gautam, Update, SUS, Settings restored MCdamping.png
                                                                                                                               Reply  Thu Apr 22 15:36:54 2021, Anchal, Update, SUS, Settings restored 
                                                                                                                                  Reply  Thu Apr 22 17:04:17 2021, gautam, Update, SUS, Settings restored 
                                                                                        Reply  Sat Apr 10 10:07:47 2021, rana, Update, SUS, Faster coil balancing 
                                                                         Reply  Fri Apr 2 15:22:54 2021, gautam, Update, SUS, Matrix results, new measurement set to trigger 
                                           Reply  Sun Mar 28 14:16:25 2021, Anchal, Summary, SUS, MC3 new Input Matrix not providing stable loop MC3_Input_Matrix_Diagonalization.pdf
                                              Reply  Mon Mar 29 17:07:17 2021, gautam, Summary, SUS, MC3 new Input Matrix not providing stable loop 
                      Reply  Thu Mar 18 13:12:39 2021, gautam, Update, Computer Scripts / Programs, Omnigraffle vs draw.io 
Message ID: 16174     Entry time: Wed Jun 2 09:43:30 2021     In reply to: 16133     Reply to this: 16175
Author: Anchal, Paco 
Type: Summary 
Category: SUS 
Subject: IMC Settings characterization 

Plot description:

  • We picked up three 10 min times belonging to the three different configurations:
    • 'Old Settings': IMC Suspension settings before Paco and I changed anything. Data taken from Apr 26, 2021, 00:30:42 PDT (GPS 1303457460).
    • 'New Settings': New input matrices uploaded on April 28th, along with F2A filters and AC coil balancing gains (see 16091). Data taken from May 01, 2021, 00:30:42 PDT (GPS 1303889460).
    • 'New settings with new gains' Above and new suspension damping gains uploaded on May5th, 2021 (see 16120). Data taken from May 07, 2021, 03:10:42 PDT (GPS 1304417460).
  • Attachment 1  shows the RMS seismic noise along X direction between 1 Hz and 3 Hz picked from C1:PEM-RMS_BS_X_1_3 during the three time durations chosen. This plot is to establish that RMS noise levels were similar and mostly constant. Page 2 shows the mean ampltidue spectral density of seismic noise in x-direction over the 3 durations.
  • Attachment 2 shows the transfer function estimate of seismic noise to MC_F during the three durations. Page 1 shows ratio of ASDs taken with median averaging while page 2 shows the same for mean averaging.
  • Attachment 3 shows the transfer function estimate of seismic noise to MC_TRANS_PIT during the three durations. Page 1 shows ratio of ASDs taken with median averaging while page 2 shows the same for mean averaging.
  • Attachment 4 shows the transfer function estimate of seismic noise to MC_TRANS_YAW during the three durations. Page 1 shows ratio of ASDs taken with median averaging while page 2 shows the same for mean averaging.

Inferences:

  • From Attachment 2 Page 1:
    • We see that 'old settings' caused the least coupling of seismic noise to MC_F signal in most of the low frequency band except between 1.5 to 3 Hz where the 'new settings' were slightly better.
    • 'new settings' also show less coupling in 4 Hz to 6 Hz band, but at these frequencies, seismix noise is filtered out by suspension, so this could be just coincidental and is not really a sign of better configuration.
    • There is excess noise coupling seen with 'new settings' between 0.4 Hz and 1.5 Hz. We're not sure why this coupling increased.
    • 'new settings with new gains' show the most coupling in most of the frequency band. Clearly, the increased suspension damping gains did not behaved well with rest of the system.
  • From Attachment 3 Page 1:
    • Coupling to MC_TRANS_PIT error signal is reduced for 'new settings' in almost all of the frequency band in comparison to the 'old settings'.
    • 'new settings with new gains' did even better below 1 Hz but had excess noise in 1 Hz to 6 Hz band. Again increased suspension damping gains did not help much.
    • But low coupling to PIT error for 'new settings' suggest that our decoupling efforts in matrix diagonalization, F2A filters and ac coil balancing worked to some extent.
  • From Attachment 4 Page 1:
    • 'new settings' and 'old settings' have the same coupling of seismic noise to MC_TRANS_YAW in all of the frequency band. This is in-line witht eh fact that we found very little POS to YAW couping in our analysis before and there was little to no change for these settings.
    • 'new settings with new gains' did better below 1 Hz but here too there was excess coupling between 1 Hz to 9 Hz.
  • Page 1 vs Page 2:
    • Mean and median should be same if the data sample was large enough and noise was stationary. A difference between the two suggests existence of outliers in the data set and median provides a better central estimate in such case.
    • MC_F: Mean and median are same below 4 hz. There are high frequency outliers above 4 Hz in 'new settings with new gains' and 'old settings' data sets, maybe due to transient higher free running laser frequency noise. But since, suspension settigns affect below 1 Hz mostly, the data sets chosen are stationary enough for us.
    • MC_TRANS_PIT: Mean ratio is lower for 'new settings' and 'old settings' in 0.3 hz to 0.8 Hz band. Same case above 4 Hz as listed above.
    • MC_TRANS_YAW:  Same as above.
  • Conclusion 1:  The 'new settings with new gains' cause more coupling to seismic noise, probably due to low phase margin in control loops. We should revert back the suspension damping gains.
  • Conclusion 2: The 'new settings' work as expected and can be kept when WFS loops are optimized further.
  • Conjecture: From our experience over last 2 weeks, locking the arms to the main laser with 'new settings with new gains' introduces noise in the arm length large enough that the Xend green laser does not remain locked to the arm for longer than tens of seconds. So this is definitely not a configuration in which we can carry out other measurements and experiments in the interferometer.
Attachment 1: seismicX.pdf  134 kB  Uploaded Wed Jun 2 16:47:24 2021  | Hide | Hide all
seismicX.pdf seismicX.pdf
Attachment 2: seismicXtoMC_F_TFest.pdf  82 kB  Uploaded Wed Jun 2 16:47:39 2021  | Hide | Hide all
seismicXtoMC_F_TFest.pdf seismicXtoMC_F_TFest.pdf
Attachment 3: seismicXtoMC_TRANS_PIT_TFest.pdf  82 kB  Uploaded Wed Jun 2 16:47:55 2021  | Hide | Hide all
seismicXtoMC_TRANS_PIT_TFest.pdf seismicXtoMC_TRANS_PIT_TFest.pdf
Attachment 4: seismicXtoMC_TRANS_YAW_TFest.pdf  83 kB  Uploaded Wed Jun 2 16:48:06 2021  | Hide | Hide all
seismicXtoMC_TRANS_YAW_TFest.pdf seismicXtoMC_TRANS_YAW_TFest.pdf
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