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Thu Apr 29 11:51:27 2021, Anchal, Summary, LSC, Start of measuring IMC WFS noise contribution in ar cavity length noise
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Thu Apr 29 15:11:33 2021, gautam, Update, CDS, RFM 
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Thu Apr 29 17:43:16 2021, Koji, Update, CDS, RFM
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Thu Apr 29 17:43:48 2021, Anchal, Update, CDS, F2A Filters double check
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Fri Apr 30 00:20:30 2021, gautam, Update, CDS, F2A Filters double check
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Thu Apr 29 17:51:19 2021, Anchal, Summary, LSC, Start of measuring IMC WFS noise contribution in arm cavity length noise
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Fri Apr 30 00:18:40 2021, gautam, Summary, LSC, Start of measuring IMC WFS noise contribution in arm cavity length noise
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Mon May 3 09:14:01 2021, Anchal, Paco, Update, LSC, IMC WFS noise contribution in arm cavity length noise 
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Mon May 3 17:28:58 2021, Anchal, Paco, Rana, Update, LSC, IMC WFS noise contribution in arm cavity length noise 
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Tue May 4 11:43:09 2021, Anchal, Paco, Update, LSC, IMC WFS noise contribution in arm cavity length noise  
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Fri May 7 11:54:02 2021, Anchal, Paco, Update, LSC, IMC WFS noise contribution in arm cavity length noise  
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Mon May 10 18:19:12 2021, Anchal, Paco, Update, LSC, IMC WFS noise contribution in arm cavity length noise, Corrections
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Wed May 12 10:53:20 2021, Anchal, Paco, Update, LSC, PSL-IMC PDH Loop and XARM PDH Loop diagram
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Message ID: 16108
Entry time: Mon May 3 09:14:01 2021
In reply to: 16101
Reply to this: 16112
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Author: |
Anchal, Paco |
Type: |
Update |
Category: |
LSC |
Subject: |
IMC WFS noise contribution in arm cavity length noise |
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Lock ARMs
- Try IFO Configure ! Restore Y Arm (POY) and saw XARM lock, not YARM. Looks like YARM biases on ITMY and ETMY are not optimal, so we slide
C1:SUS-ETMY_OFF from 3.0 --> -14.0 and watch Y catch its lock.
- Run ASS scripts for both arms and get TRY/TRX ~ 0.95
- We ran X, then Y and noted that TRX dropped to ~0.8 so we ran it again and it was well after that. From now on, we will do Y, then X.
WFS1 noise injection
- Turn WFS limits off by running
switchOffWFSlims.sh
- Inject broadband noise (80-90 Hz band) of varying amplitudes from 100 - 100000 counts on C1:IOO-WFS1_PIT_EXC
- After this we try to track its propagation through various channels, starting with
C1:LSC-XARM_IN1_DQ / C1:LSC-YARM_IN1_DQ
C1:SUS-ETMX_LSC_OUT_DQ / C1:SUS-ETMY_LSC_OUT_DQ
C1:IOO-MC_F_DQ
C1:SUS-MC1_**COIL_OUT / C1:SUS-MC2_**COIL_OUT / C1:SUS-MC3_**COIL_OUT
C1:IOO-WFS1_PIT_ERR / C1:IOO-WFS1_YAW_ERR
C1:IOO-WFS1_PIT_IN2
** denotes [UL, UR, LL, LR]; the output coils.
- Attachment 1 shows the power spectra with IMC unlocked
- Attachment 2 shows the power spectra with the ARMs (and IMC) locked
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