 Sat Jul 30 10:38:12 2022, Anchal, Update, PSL, FSSSlow/MCAutolocker issue (docker)
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The FSSSlow script was not properly documented and it was not working, so I had to use one that I knew worked from CTN. This scripts lives in
/opt/rtcds/caltech/c1/Git/40m/scripts/PSL/FSS/PIDLocker.py
and uses a configuration file |
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Sat Jul 30 12:48:18 2022, Koji, Update, PSL, FSSSlow/MCAutolocker issue (docker)
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> it only starts working when C1:IOO-MC_LOCK is 1 and C1:PSL-FSS_SLOWLOOP is 1.
- OK. Your new MCAutolocker does not reflect the lock status to C1:IOO-MC_LOCK. This causes FSS Slow to go crazy when the IMC is not locked.
Can you fix that? |
Tue Aug 2 01:10:26 2022, Koji, Update, IOO, WFS investigation 
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Continued to work on the WFS repair
Demod phase adjustment:
- Use the PDH signal to adjust the demodulation phase to have uniform signals between the segments. |
 Wed Aug 3 15:01:13 2022, Koji, Update, General, Borrowed Dsub cables
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Borrowed DSUB cables for Juan's SURF project
- 2x D25F-M cables (~6ft?)
- 2x D2100103 ReducerCables |
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Wed Aug 3 16:00:51 2022, yuta, Update, BHD, BHD fringe aligned with reduced LO and AS beam clipping
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Last week, we could find an alignment which realizes LO beam and AS beam both unclipped, but it was not consistent with an alignment which realize BHD
fringe (40m/17046).
Today, we tweaked the alignment of SR2, AS1, AS4 to have BHD fringe with reduced LO and AS beam clipping. |
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Thu Aug 4 11:28:22 2022, Anchal, Update, PSL, FSSSlow/MCAutolocker issue (docker)
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Added C1:IOO-MC_LOCK to ALConfigMC.yml which solved
the isse with FSS Slow. We should tune the FSS Slow Servo PID coefficients for a better performance.
the C1PSL_SLOW.adl screen is not obsolete. It can be used to change the PID coefficients, engage/disengage the PID loop, monitor the PID script |
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Thu Aug 4 19:01:59 2022, Tega, Update, Computers, Front-end machine in supermicro boxes
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Koji and JC looked around the lab today and found some supermicro boxes which I was told to look into to see if they have any useful computers.
Boxes next to Y-arm cabinets (3 boxes: one empty) |
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Thu Aug 4 21:58:18 2022, Koji, Update, IOO, WFS investigation
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OK... It seems that all the 6 dof of the IMC WFS servo loops were closed with some condition...
- Measured the transfer functions from ASCPIT/YAW_EXC of each suspensions to WFS segs.
- FInd the proper input matrix for PIT and YAW for WFS1 and WFS2 |
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Thu Aug 4 22:14:20 2022, Koji, Update, IOO, WFS investigation
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Sensing matrix measurement
MCx_ASCyyy_EXC was shaken with the amplitude of 3000 cnt. Measure the transfer functions to each segment of the WFS I&Q demod outputs.
- Pitch excitations consistently indicated WFS1 SEG2&3 / SEG1&4, and WFS2 SEG 1&2 / SEG 3&4 are |
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Thu Aug 4 22:14:38 2022, Koji, Update, IOO, WFS investigation
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WFS/MCTRANS_QPD Power Spectra
Attachment 1: HEPA ON
WFS1/2 PIT/YAW Spectra are stabilized below 1Hz (0.1Hz for WFS1P) |
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Thu Aug 4 22:32:31 2022, Koji, Update, IOO, Upon leaving the lab (WFS investigation)
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Upon leaving the lab:
- HEPA is ON at the original speed (i.e. same speed at 5PM today)
- WFS servo is ON, partly because we want to see how stable it is. It is not handled with the autolocker right now. |
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Fri Aug 5 12:42:12 2022, Koji, Update, IOO, IMC WFS: Overnight observation
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The IMC lock survived overnight and the WFS servo loops kept it aligned. The IMC was unlocked in the morning.
The left 6 plots are the WFS servo outputs and the right most two plot show the transmission and reflection of the IMC.
If the WFS is making the lock unstable under high seismic conditions, please turn the loops off. |