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ID Date Authorup Type Category Subject Text Attachments
  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 
  15995   Mon Apr 5 08:25:59 2021 Anchal, PacoUpdateGeneralRestore MC from early quakes[Paco, Anchal]

Came in a little bit after 8 and
found the MC unlocked and struggling to lock
  
  16001   Tue Apr 6 18:46:36 2021 Anchal, PacoUpdateSUSUpdates on recent effortsAs mentioned in last post, we earlier made
an error in making sure that all time series
arrays go in with same sampling rate in CSD
 FirstMeasurementPlots.pdf 
  16007   Thu Apr 8 17:04:43 2021 Anchal, PacoUpdateSUSFirst Successful Coil BalancingToday, we finally crossed the last hurdle
and got a successful converging coil balancing
run. 
 SDistanceFromIdentity.pdfSmatIterations.pdfSmatrixPlots.pdf 
  16009   Fri Apr 9 13:13:00 2021 Anchal, PacoUpdateSUSFaster coil balancingWe ran again this method but with the 'b'
parameter as a matrix instead. This provides
more gain on some off-diagonal terms than
 SmatIterations.pdfMC2AllOutmat.txt 
  16016   Mon Apr 12 08:32:54 2021 Anchal, PacoSummaryPSLPMC unlocked at 2pm on Sunday; ~ RestoredPMC lost lock between 21:00 and 22:00 UTC
on April 11th as seen in the summary pages:

https://nodus.ligo.caltech.edu:30889/detcharsummary/day/20210411/psl/#gallery-4
  
  16042   Fri Apr 16 11:36:36 2021 Anchal, PacoUpdateSUSTested proposed filters for POS colum in MC2 output matrixWe tried two sets of filters on the output
matrix POS column in MC2. Both versions failed.
Following are some details.
 20210416_MC2DCcoilBalancingNoFilters.pdfuncFilters.pdf20210416_MC2DCcoilBalancingWithFilters.pdfuncFilters_v2.pdf20210416_MC2DCcoilBalancingWithFilters_v2.pdf 
  16049   Mon Apr 19 12:18:19 2021 Anchal, PacoUpdateSUSTested proposed filters for POS colum in MC2 output matrixThe filters were somewhat successful, how
much we can see in attachment 1. The tip
about difference between eigenmode basis
 CrossCoupleTestForEgToCtFilters.pdfuncFilters.pdfuncFilters_v2.pdf 
  16054   Tue Apr 20 10:52:49 2021 Anchal, PacoUpdateSUSAC gain coil output balancing for IMC[Paco, Anchal]


We adopted the following
procedure to balance the coil output gains
 POS2PYuncoupled.pdfPIT2PYuncoupled.pdfMC1YAWexc.pdfMC1PITexc.pdf 
  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 
  16066   Wed Apr 21 15:50:01 2021 Anchal, PacoUpdateSUSMC2 Suspension Optimization summary
MC2
Coil Balancing DC and AC Gains


  
  16072   Thu Apr 22 12:17:23 2021 Anchal, PacoUpdateSUSMC1 and MC3 Suspension Optimization Summary    
  16085   Mon Apr 26 18:52:52 2021 Anchal, PacoHowToComputer Scripts / Programsawg free slotToday we had some trouble launching an
excitation on C1:IOO-MC_LSC_EXC from awggui.
The error read:
  
  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 
  16087   Tue Apr 27 10:05:28 2021 Anchal, PacoUpdateSUSMC1 and MC3 F2A Filters TestedWe extended the f2a filter implementation
and diagnostics as summarized in 16086
to MC1 and MC3.
 IMC_F2A_Params_MC1.pdfMC1_POStoAng_CrossCoupling.pdfIMC_F2A_Params_MC3.pdfMC3_POStoAng_CrossCoupling.pdf 
  16089   Wed Apr 28 10:56:10 2021 Anchal, PacoUpdateSUSIMC Filters diagnosedGood
morning!
 7x 
  16108   Mon May 3 09:14:01 2021 Anchal, PacoUpdateLSCIMC WFS noise contribution in arm cavity length noiseLock
ARMs
 WFS1_PIT_Noise_Inj_Test_IMC_unlocked.pdfWFS1_PIT_Noise_Inj_Test_ARM_locked.pdf 
  16117   Tue May 4 11:43:09 2021 Anchal, PacoUpdateLSCIMC WFS noise contribution in arm cavity length noiseWe redid the WFS noise injection test and
have compiled some results on noise contribution
in arm cavity noise and IMC frequency noise
 ArmCavNoiseContributions.pdfIOO-MC1_PIT_NoiseInjTest2.pdfIOO-MC1_PIT_NoiseInjTest_AWGGUI_Config.png 
  16127   Fri May 7 11:54:02 2021 Anchal, PacoUpdateLSCIMC WFS noise contribution in arm cavity length noiseWe today measured the calibration factors
for XARM_OUT and YARM_OUT in nm/cts and replotted
our results from 16117
 ITMX-XARM_TF.pdfITMY-YARM_TF.pdfArmCavNoiseContributions.pdf 
  16128   Mon May 10 10:57:54 2021 Anchal, PacoSummaryCalibrationUsing ALS beatnote for calibration, testTest details:


We
locked both arms and opened the shutter for
Yend green laser.
After toggling
 BeatY_ITMY_CalibrationAt57Hz.pdfBeatY_ITMY_CalibrationAt43Hz.pdfBeatY_ITMY_CalibrationAt77Hz.pdf 
  16129   Mon May 10 18:19:12 2021 Anchal, PacoUpdateLSCIMC WFS noise contribution in arm cavity length noise, CorrectionsA few corrections to last analysis:


The first plot was not
IMC frequency noise but actually MC_F noise
 ArmCavNoiseContributions.pdf 
  16132   Wed May 12 10:53:20 2021 Anchal, PacoUpdateLSCPSL-IMC PDH Loop and XARM PDH Loop diagramAttached is the control loop diagram when
main laser is locked to IMC and a single
arm (XARM) is locked to the transmitted light
 IMC_SingleArm.pdf 
  16133   Wed May 12 11:45:13 2021 Anchal, PacoSummarySUSNew IMC Settings are miserableWe picked a few parameters from 40m summary
page and plotted them to see the effect of
new settings. On April 4th, old settings
 MC_F_Comparison.pdfMC_TRANS_QPD_Comparison.pdfIMC_REFL_DC_Comparison.pdf 
  16138   Thu May 13 11:55:04 2021 Anchal, PacoUpdateSUSMC1 suspension misbehavingWe came in the morning with the following
scene on the zita monitor:

 Screenshot_from_2021-05-13_09-50-24.pngMC1_Glitches_Invest2.pdf 
  16157   Mon May 24 19:14:15 2021 Anchal, PacoSummarySUSMC1 Free Swing Test set to triggerWe've set a free swing test to trigger
at 3:30 am tomorrow for MC1. The script for
tests is running on tmux session named 'freeSwingMC1'
  
  16159   Tue May 25 10:22:16 2021 Anchal, PacoSummarySUSMC1 new input matrix calculated and uploadedThe test was succesful and brought back
the IMC to lock point at the end.

We calculated new input matrix
 SUS_Input_Matrix_Diagonalization.pdf 
  16161   Tue May 25 17:42:11 2021 Anchal, PacoSummaryALSALS Single Arm Noise BudgetHere is our first attempt at a single-arm
noise budget for ALS.

Attachment 1 shows
 ALS_IR_b.svgALS_Single_Arm_IR.pdf 
  16163   Wed May 26 11:45:57 2021 Anchal, PacoConfigurationIMCMC2 analog camera[Anchal, Paco]

We went near the MC2 area and opened
the lid to inspect the GigE and analog video
  
  16164   Thu May 27 11:03:15 2021 Anchal, PacoSummaryALSALS Single Arm Noise BudgetHere's an updated X ARM ALS noise budget.

Things to remember:


Major
mistake we were making earlier was that we
 ALS_Single_X_Arm_IR.pdfALS_OOL_with_Ref.pdf 
  16171   Tue Jun 1 16:55:32 2021 Anchal, PacoSummaryALSSingle Arm Actuation Calibration with IR ALS BeatRana suggested in today's meeting to
put in a notch filter in the XARM IR PDH
loop to avoid suppressing the excitation
 SingleArmActCalwithIRALSBeat-1306624785.pdf 
  16174   Wed Jun 2 09:43:30 2021 Anchal, PacoSummarySUSIMC Settings characterizationPlot description:


We
picked up three 10 min times belonging to
the three different configurations:

'Old
 seismicX.pdfseismicXtoMC_F_TFest.pdfseismicXtoMC_TRANS_PIT_TFest.pdfseismicXtoMC_TRANS_YAW_TFest.pdf 
  16175   Wed Jun 2 16:20:59 2021 Anchal, PacoSummarySUSIMC Suspension gains reverted to old valuesFollowing the conclusion, we are reverting
the suspension gains to old values, i.e.

  
  16192   Tue Jun 8 11:40:53 2021 Anchal, PacoSummaryALSSingle Arm Actuation Calibration with IR ALS BeatWe attempted to simulate "oscillator
based realtime calibration noise monitoring"
in offline analysis with python. This helped
 ITMX_Cal_Noise_Spectrum_1307143423.pdf 
  16194   Wed Jun 9 11:46:01 2021 Anchal, PacoSummaryAUXXend Green Laser PDH OLTF measurementWe measured the Xend green laser PDH Open
loop transfer function by following method:


We first measured the feedback
 image-6f2923a3-01ce-4d04-bc53-d8db0238e195.jpgimage-72223f4b-3b74-4574-a7ad-de6628a2c5e9.jpgX_Green_ARM_PDH_OLTF.pdf 
  16196   Wed Jun 9 18:29:13 2021 Anchal, PacoSummaryALSCheck for saturation in ITMX SOS DriverWe did a quick check to make sure there
is no saturation in the C1:SUS-ITMX_LSC_EXC
analog path. For this, we looked at the SOS
  
  16202   Tue Jun 15 15:26:43 2021 Anchal, PacoSummaryAUXXend Green Laser PDH OLTF measurement loop algebra, excitation at control pointAttachment 1 shows the case when excitation
is sent at control point i.e. the PZT output.
As before, free running laser noise 
 AuxPDHloop.pdf 
  16204   Wed Jun 16 13:20:19 2021 Anchal, PacoSummaryCamerasMon 7 in Control Room ReplacedWe replaced the Mon 7 with an LCD monitor
from back bench. It is fed the analog signal
from BNC converted into VGS with a converter
 IMG_20210616_083810.jpg 
  16209   Thu Jun 17 11:45:42 2021 Anchal, PacoUpdateSUSMC1 Gave trouble againTL;DR

MC1 LL Sensor showed signs of fluctuating
large offsets. We tried to find the issue
 SummaryScreenShot.pngMC1_LL_SENSOR_DEAD.png 
  16210   Thu Jun 17 16:37:23 2021 Anchal, PacoUpdateSUSc1susaux computer rebootedJon suggested to reboot the acromag chassis,
then the computer, and we did this without
success. Then, Koji suggested we try running
  
  16213   Fri Jun 18 10:07:23 2021 Anchal, PacoSummaryAUXXend Green Laser PDH OLTF with coherenceWe did the measurement of OLTF for Xend
green laser PDH loop with excitation added
at control point using a SR560 as shown in
 XEND_PDH_OLTF_with_Coherence.pdfBeta_Amp.pdf 
  16218   Tue Jun 22 11:56:16 2021 Anchal, PacoUpdateSUSADC/Slow channels issuesWe checked back in time to see how the
BS and PRM OSEM slow channels are zero. It
was clear that they became zero when we worked
 CDS_FE_Status.png 
  16445   Tue Nov 2 18:54:41 2021 Anchal, PacoUpdateBHDOptical fibres laid for BHD upgradeWe successfully laid down all required
optical fibre fiber cables from 1X4-1X7
region to 1Y1-1Y3 region today. This includes
  
  16228   Tue Jun 29 17:42:06 2021 Anchal, Paco, GautamSummaryLSCMICH locking tutorial with GautamToday we went through LSC locking mechanics
with Gautam and as a "Hello World"
example, worked on locking michelson cavity.
  
  16237   Fri Jul 2 12:42:56 2021 Anchal, Paco, GautamSummaryLSCsnap file changed for MICHWe corrected the MICH locking snap file
C1configure_MI.req and saved an updated C1configure_MI.snap.
Now the 'Restore MICH' script in
  
  16239   Tue Jul 6 16:35:04 2021 Anchal, Paco, GautamUpdateIOORestored MCWe found that megatron is unable to properly
run scripts/MC/WFS/mcwfsoff and scripts/MC/WFS/mcwfson
scripts. It fails cdsutils commands due to
  
  16241   Thu Jul 8 11:20:38 2021 Anchal, Paco, GautamSummaryLSCPRFPMI locking attemptsLast night Gautam walked us through the
algorithm used to lock PRFPMI. We tried it
several times with the PSL HEPA filter off
  
  16112   Mon May 3 17:28:58 2021 Anchal, Paco, RanaUpdateLSCIMC WFS noise contribution in arm cavity length noiseRana came and helped us figure us where
to inject the noise. Following are the characteristics
of the test we did:
 excitationoftheMCanglessothatwecanseesomethingdotpng.pngexcitationoftheMCanglessothatwecanseesomethingdotpngbutthistimeitsMC2.png 
  16190   Mon Jun 7 15:37:01 2021 Anchal, Paco, YehonathanSummaryCamerasMon 7 in Control Room DiedWe found Mon7 in control room dead today
afternoon. It's front power on green
light is not lighting up. All other monitors
  
  10130   Sat Jul 5 04:18:45 2014 AndresUpdate40m Xend Table upgradeAdding Two Lenses After the Second Steering Mirror in Order Two Increase the Gouy Phase Difference Between the Sterring MirrorsI had been working on the Xend table optical
layout update. Since the two steering mirrors
in the Xend green are too close to each,
 7x 
  10191   Sun Jul 13 17:06:35 2014 AndresUpdate40m Xend Table upgradeXarm Table Upgrade Calculation and Diagrams of possible new table layout Current Mode Matching
and Gouy Phase Between Steering Mirrors
 CurrentOpticalLayout.pngNewSetUp.PNGAlaModeSolutionplots.pngEntireScaleRangeAlaModeSolution.pngNewXarmOptimizationFromFaraday.m 
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