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  40m Log, Page 320 of 350  Not logged in ELOG logo
ID Date Author Type Categoryup Subject Text Attachments
  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 
  16010   Fri Apr 9 17:41:12 2021 ranaUpdateSUSFaster coil balancingconvergence is great.

Next we wanna get the F2A filters
made since most of the IMC control happens
  
  16014   Sat Apr 10 10:07:47 2021 ranaUpdateSUSFaster coil balancingI think I mis-spoke about the balancing
channels before. The ~20 Hz balancing
could go into either the COIL banks or the
  
  16017   Mon Apr 12 10:07:35 2021 AnchalUpdateSUSWhat's F2A??I'm not sure I understand what F2A
is? I couldn't find a description of
this filter anywhere and don't remember
  
  16020   Tue Apr 13 09:51:22 2021 ranaUpdateSUSWhat's F2A??Force to Angle. It just means the filters
that are in the POS OUTPUT matrix. I think
in the past sometimes they are called F2P
  
  16031   Wed Apr 14 17:53:38 2021 AnchalUpdateSUSPlan for calculating filter banks for output matrix aka F2A aka F2PPlan of action


Get
the transfer functions of the suspension
plant from actuated DOF to sensed DOF. We'll
 MC2propF2A_UL.pdf 
  16035   Thu Apr 15 11:41:43 2021 AnchalUpdateSUSProposed filters for output matrix aka F2A aka F2PHere' s aquick update before we leave
for lunch. We have managed to calculate some
filter that would go on the POS column in
 MC2propPOSfb.pdf 
  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 
  16043   Fri Apr 16 15:47:58 2021 ranaUpdateSUSTested proposed filters for POS colum in MC2 output matrixLooks mostly right, but you
used the OSEM sensors as readbacks.
  
  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 
  16055   Tue Apr 20 18:19:30 2021 AnchalUpdateSUSMC2 coil balanced at DCFollowing up from morning's work, I
balanced the coils at DC as well. Attachment
1 is screenshot of striptool in which blue
 MC2_DC_Coil_Balanced_St.pngIMC_F2A_Params_MC2.pdfUploadedPOS_F2A_Filters.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


  
  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
  
  16072   Thu Apr 22 12:17:23 2021 Anchal, PacoUpdateSUSMC1 and MC3 Suspension Optimization Summary    
  16073   Thu Apr 22 14:22:39 2021 gautamUpdateSUSSettings restoredThe MC / WFS stability seemed off to me.
Trending some channels at random, I saw that
the MC3 PIT/YAW gains were restored mixed
 MCdamping.png 
  16078   Thu Apr 22 15:36:54 2021 AnchalUpdateSUSSettings restoredThe mix up was my fault I think. I restored
the channels manually instead of using burt
restore. Your message suggests that we can
  
  16079   Thu Apr 22 17:04:17 2021 gautamUpdateSUSSettings restoredIndeed, you can make your own snapshot
by specifying the channels to snap in a .req
file. But what I meant was, we should confirm
  
  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 
  16091   Wed Apr 28 17:09:11 2021 AnchalUpdateSUSTuned Suspension Parameters uploaded for long term behavior monitoringI have uploaded all the new settings mentioned
in 16066
and 16072.
  
  16094   Thu Apr 29 10:52:56 2021 AnchalUpdateSUSIMC Trans QPD and WFS loops step response testIn 16087
we mentioned that we were unable to do a
step response test for WFS loop to get an
 PIT_OFFSET_ON_MC2.pngYAW_STEP_ON_MC2_complete.png 
  16102   Thu Apr 29 18:53:33 2021 AnchalUpdateSUSIMC Suspension Damping Gains TestWith the input matrix, coil ouput gains
and F2A filters loaded as in 16091,
I tested the suspension loops' step response
 MC1_SUSDampGainTest.pdfMC2_SUSDampGainTest.pdfMC3_SUSDampGainTest.pdf 
  16110   Mon May 3 16:24:14 2021 AnchalUpdateSUSIMC Suspension Damping Gains Test Repeated with IMC unlockedWe repeated the same test with IMC unlocked.
We had found these gains when IMC was unlocked
and their characterization needs to be done
 MC1_SusDampGainTest.pdfMC2_SusDampGainTest.pdfMC3_SusDampGainTest.pdf 
  16120   Wed May 5 09:04:47 2021 AnchalUpdateSUSNew IMC Suspension Damping Gains uploaded for long term testingWe have uploaded the new damping gains
on all the suspensions of IMC. This completes
changing all the configuration to as mentioned
  
  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 
  16135   Wed May 12 14:23:20 2021 JordanUpdateSUSMass Properties of SOS Assembly with 3"->2" Optic sleeve, in SI units   Moments_of_Inertia_SI.PNG 
  16136   Wed May 12 16:53:59 2021 KojiUpdateSUSMass Properties of SOS Assembly with 3"->2" Optic sleeve, in SI unitsNo, this is the property of the suspension
assembly. The mass says 10kg

Could you do the same for the testmass
  
  16137   Wed May 12 17:06:52 2021 JordanUpdateSUSMass Properties of SOS Assembly with 3"->2" Optic sleeve, in SI unitsHere are the mass properties for the only
the test mass assembly (optic, 3" ring,
and wire block). (Updated with g*mm^2)
 Moments_of_Inertia_SI.PNG 
  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 
  16139   Thu May 13 19:38:54 2021 AnchalUpdateSUSMC1 Satellite Amplifier Debugged[Anchal Koji]

Koji and I did a few tests with
an OSEM emulator on the satellite amplifier
 MC1_UL_Channel_Fixed.png 
  16143   Sat May 15 14:54:24 2021 gautamUpdateSUSIMC settings revertedI want to work on the IFO this weekend,
so I reverted the IMC suspension settings
just now to what I know work (until the new
 MC2coilOut.png 
  16146   Wed May 19 18:29:41 2021 KojiUpdateSUSMass Properties of SOS Assembly with 3"->2" Optic sleeve, in SI unitsCalculation for the SOS POS/PIT/YAW resonant
frequencies

- Nominal height gap between the
 SOS_resonant_freq.pdfSOS_resonant_freq.nb.zip 
  16147   Thu May 20 10:35:57 2021 AnchalUpdateSUSIMC settings revertedFor future reference, the new settings
can be upoaded from a script in the same
directory. Run python /users/anchal/20210505_IMC_Tuned_SUS_with_Gains/uploadNewConfigIMC.py
  
  16149   Fri May 21 00:05:45 2021 KojiUpdateSUSNew electronics: Sat Amp / Coil Drivers11 new Satellite Amps were picked up from
Downs. 7 more are coming from there. I have
one spare unit I made. 1 sat amp has already
 F3CDEF8D-4B1E-42CF-8EFC-EA1278C128EB_1_105_c.jpeg 
  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 
  16165   Thu May 27 14:11:15 2021 JordanUpdateSUSCoM to Clamping Point Measurement for 3" Adapter RingThe current vertical distance between the
CoM and the wire clamping point on the 3"
Ring assembly is 0.33mm. That is the CoM
 CoM_to_Clamp.PNGCoM_to_Clamp_2.PNG 
  16169   Tue Jun 1 14:26:23 2021 JordanUpdateSUSCoM to Clamping Point Measurement for 3" Adapter RingAfter changing the material of the Balance
Mass from 6061 Al to 304 Steel, and changing
the thickness to 0.21" from 0.25".
 CoM_to_Clamp_Updated.PNG 
  16173   Wed Jun 2 01:08:57 2021 KojiUpdateSUSCoM to Clamping Point Measurement for 3" Adapter RingHow about to use the non-Ag coated threaded
shaft + the end SS masses with helicoils
inserted? Does this save the masses to get
  
  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.

  
  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
  
  16212   Thu Jun 17 22:25:38 2021 KojiUpdateSUSNew electronics: Sat Amp / Coil DriversIt is a belated report: We received 5 more
sat amps on June 4th. (I said 7 more but
it was 6 more) So we still have one more
 P_20210604_231028.jpeg 
  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 
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