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40m Log |
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Mon Mar 8 12:01:02 2021, Paco, Anchal, Summary, training, Investigate how-to XARM locking
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Mon Mar 8 12:40:35 2021, gautam, Summary, training, Investigate how-to XARM locking
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Mon Mar 8 19:22:56 2021, rana, Summary, SUS, IMC suspension characterization
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Thu Mar 11 08:13:24 2021, Paco, Anchal, Update, SUS, IMC First Free Swing Test failed due to typo, restarting now
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Tue Mar 16 19:13:09 2021, Paco, Anchal, Update, SUS, First success in Input Matric Diagonalization 
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Wed Mar 17 11:57:54 2021, Paco, Anchal, Update, SUS, Tested New Input Matrix for MC1 
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Wed Mar 17 16:30:46 2021, Anchal, Update, SUS, Normalized Input Matrices plotted better than SURF students 
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Thu Mar 18 09:18:49 2021, Paco, Anchal, Update, SUS, Testing of new input matrices with new data 
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Thu Mar 18 12:46:53 2021, rana, Update, SUS, Testing of new input matrices with new data
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Fri Mar 19 10:49:44 2021, Paco, Anchal, Update, SUS, Trying coil actuation balance
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Mon Mar 22 11:57:21 2021, Paco, Anchal, Update, SUS, Trying coil actuation balance 
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Mon Mar 22 15:10:00 2021, rana, Update, SUS, Trying coil actuation balance
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Mon Mar 22 19:07:50 2021, Paco, Anchal, Update, SUS, Trying coil actuation balance 8x
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Tue Mar 23 09:16:42 2021, Paco, Anchal, Update, Computers, Power cycled C1PSL; restored C1PSL 
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Wed Mar 24 09:23:49 2021, Paco, Update, SUS, MC3 new Input Matrix
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Thu Mar 25 11:46:31 2021, Paco, Anchal, Update, SUS, MC2 Coil Balancing updates   
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Thu Mar 25 15:31:24 2021, gautam, Update, IOO, WFS servos
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Fri Mar 26 11:54:37 2021, Paco, Anchal, Update, SUS, MC2 Coil Balancing updates
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Mon Mar 29 10:44:51 2021, Paco, Anchal, Update, SUS, MC2 Coil Balancing updates 
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Mon Mar 29 17:11:54 2021, gautam, Update, SUS, MC2 Coil Balancing updates
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Mon Mar 29 17:34:52 2021, rana, Update, SUS, MC2 Coil Balancing updates
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Wed Mar 31 22:58:32 2021, Anchal, Paco, Update, SUS, MC2 Coil Balancing Test
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Thu Apr 1 13:56:49 2021, Anchal, Paco, Update, SUS, MC2 Coil Balancing Test Results  
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Thu Apr 1 18:01:06 2021, Anchal, Paco, Update, SUS, MC2 Coil Balancing Test Results Success??  
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Thu Apr 1 18:48:45 2021, gautam, Update, SUS, MC2 Coil Balancing Test Results Success??
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Thu Apr 1 21:13:54 2021, Anchal, Update, SUS, Matrix results, new measurement set to trigger
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Fri Apr 2 14:51:20 2021, Anchal, Update, SUS, Bug found, need to redo the balancing
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Tue Apr 6 18:46:36 2021, Anchal, Paco, Update, SUS, Updates on recent efforts
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Wed Apr 7 17:38:51 2021, Anchal, Update, SUS, Trying to uncouple only PIT and YAW first    
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Thu Apr 8 17:04:43 2021, Anchal, Paco, Update, SUS, First Successful Coil Balancing  
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Fri Apr 9 13:13:00 2021, Anchal, Paco, Update, SUS, Faster coil balancing 
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Fri Apr 9 17:41:12 2021, rana, Update, SUS, Faster coil balancing
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Mon Apr 12 10:07:35 2021, Anchal, Update, SUS, What's F2A??
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Tue Apr 13 09:51:22 2021, rana, Update, SUS, What's F2A??
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Wed Apr 14 17:53:38 2021, Anchal, Update, SUS, Plan for calculating filter banks for output matrix aka F2A aka F2P
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Thu Apr 15 11:41:43 2021, Anchal, Update, SUS, Proposed filters for output matrix aka F2A aka F2P
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Fri Apr 16 11:36:36 2021, Anchal, Paco, Update, SUS, Tested proposed filters for POS colum in MC2 output matrix    
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Fri Apr 16 15:47:58 2021, rana, Update, SUS, Tested proposed filters for POS colum in MC2 output matrix
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Mon Apr 19 12:18:19 2021, Anchal, Paco, Update, SUS, Tested proposed filters for POS colum in MC2 output matrix  
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Tue Apr 20 10:52:49 2021, Anchal, Paco, Update, SUS, AC gain coil output balancing for IMC   
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Tue Apr 20 18:19:30 2021, Anchal, Update, SUS, MC2 coil balanced at DC  
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Wed Apr 21 11:38:27 2021, Anchal, Paco, Update, SUS, MC2 Damping Gains Optimized 
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Wed Apr 21 15:50:01 2021, Anchal, Paco, Update, SUS, MC2 Suspension Optimization summary
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Wed Apr 21 18:49:29 2021, rana, Update, SUS, MC2 Suspension Optimization summary
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Thu Apr 22 08:50:21 2021, Anchal, Update, SUS, MC2 Suspension Optimization summary
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Mon Apr 26 18:55:39 2021, Anchal, Paco, Update, SUS, MC2 F2A Filters Tested  
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Tue Apr 27 10:05:28 2021, Anchal, Paco, Update, SUS, MC1 and MC3 F2A Filters Tested   
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Wed Apr 28 10:56:10 2021, Anchal, Paco, Update, SUS, IMC Filters diagnosed 7x
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Wed Apr 28 17:09:11 2021, Anchal, Update, SUS, Tuned Suspension Parameters uploaded for long term behavior monitoring
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Thu Apr 29 10:52:56 2021, Anchal, Update, SUS, IMC Trans QPD and WFS loops step response test 
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Thu Apr 29 18:53:33 2021, Anchal, Update, SUS, IMC Suspension Damping Gains Test  
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Mon May 3 16:24:14 2021, Anchal, Update, SUS, IMC Suspension Damping Gains Test Repeated with IMC unlocked  
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Wed May 5 09:04:47 2021, Anchal, Update, SUS, New IMC Suspension Damping Gains uploaded for long term testing
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Wed May 12 11:45:13 2021, Anchal, Paco, Summary, SUS, New IMC Settings are miserable  
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Wed Jun 2 09:43:30 2021, Anchal, Paco, Summary, SUS, IMC Settings characterization   
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Wed Jun 2 16:20:59 2021, Anchal, Paco, Summary, SUS, IMC Suspension gains reverted to old values
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Sat May 15 14:54:24 2021, gautam, Update, SUS, IMC settings reverted
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Thu May 20 10:35:57 2021, Anchal, Update, SUS, IMC settings reverted
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Thu Apr 22 12:17:23 2021, Anchal, Paco, Update, SUS, MC1 and MC3 Suspension Optimization Summary
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Thu Apr 22 14:22:39 2021, gautam, Update, SUS, Settings restored
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Thu Apr 22 15:36:54 2021, Anchal, Update, SUS, Settings restored
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Thu Apr 22 17:04:17 2021, gautam, Update, SUS, Settings restored
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Sat Apr 10 10:07:47 2021, rana, Update, SUS, Faster coil balancing
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Fri Apr 2 15:22:54 2021, gautam, Update, SUS, Matrix results, new measurement set to trigger
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Sun Mar 28 14:16:25 2021, Anchal, Summary, SUS, MC3 new Input Matrix not providing stable loop
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Mon Mar 29 17:07:17 2021, gautam, Summary, SUS, MC3 new Input Matrix not providing stable loop
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Thu Mar 18 13:12:39 2021, gautam, Update, Computer Scripts / Programs, Omnigraffle vs draw.io
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Message ID: 16110
Entry time: Mon May 3 16:24:14 2021
In reply to: 16102
Reply to this: 16120
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Author: |
Anchal |
Type: |
Update |
Category: |
SUS |
Subject: |
IMC Suspension Damping Gains Test Repeated with IMC unlocked |
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We repeated the same test with IMC unlocked. We had found these gains when IMC was unlocked and their characterization needs to be done with no light in the cavity. attached are the results. Everything else is same as before.
Quote: |
With the input matrix, coil ouput gains and F2A filters loaded as in 16091, I tested the suspension loops' step response to offsets in LSC, ASCPIT and ASCYAW channels, before and after applying the "new damping gains" mentioned in 16066 and 16072. If these look better, we should upload the new (higher) damping gains as well. This was not done in 16091.
Note that in the plots, I have added offsets in the different channels to plot them together, hence the units are "au".
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Edit Tue May 4 14:43:48 2021 :
- Adding zoomed in plots to show first 25s after the step.
- MC1:
- Our improvements by new gains are only modest.
- This optic needs a more careful coil balancing first.
- Still the ring time is reduced to about 5s for all step responses as opposed to 10s at old gains.
- MC2:
- The first page of MC2 might be bit misleading. We have not changed the damping gain for SUSPOS channel, so the longer ringing is probably just an artifact of somthing else. We didn't retake data.
- In PIT and YAW where we increased the gain by a factor of 3, we see a reduction in ringing lifetime by about half.
- MC3:
- We saw the most optimistic improvement on this optic.
- The gains were unusually low in this optic, not sure why.
- By increasing SUSPOS gain from 200 to 500, we saw a reduction of ringing halftime from 7-8s to about 2s. Improvements are seen in other DOFs as well.
- You can notice rightaway that YAW of MC3 keeps oscillating near resonance (about 1 Hz). Maybe more careful feedback shaping is required here.
- In SUSPIT, we increased gain from 12 to 35 and saw a good reduction in both ringing time and initial amplitude of ringing.
- In SUSYAW, we only increased the gain to 12 from 8, which still helped a lot in reducing big ringing step response to below 5s from about 12s.
Overall, I would recommend setting the new gains in the suspension loops as well to observe long term effects too. |
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