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| 40m Log |
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 Fri Dec 27 16:26:11 2019, Yehonathan, Update, PSL, PMC Linewidth measurement 
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 Wed Jan 1 14:14:00 2020, Yehonathan, Update, PSL, PMC Linewidth measurement
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Wed Jan 15 15:04:31 2020, gautam, Update, PSL, PMC Linewidth measurement
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Fri Jan 17 22:11:19 2020, Yehonathan, Update, PSL, Ringdown measurements
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Sat Jan 25 11:54:42 2020, Yehonathan, Update, PSL, Ringdown measurements
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Mon Jan 27 21:35:06 2020, Yehonathan, Update, PSL, Ringdown measurements
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Mon Jan 27 21:48:49 2020, gautam, Update, PSL, Ringdown measurements
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Tue Jan 28 16:01:17 2020, gautam, Update, IOO, IMC WFS servos stable again
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Tue Jan 28 20:51:37 2020, Yehonathan, Update, IOO, IMC WFS servos stable again
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Wed Jan 29 12:40:24 2020, Yehonathan, Update, IOO, IMC Ringdowns preliminary data analysis
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Mon Feb 3 13:54:10 2020, Yehonathan, Update, IOO, IMC Ringdowns extended data analysis
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Wed Feb 5 21:13:17 2020, Yehonathan, Update, IOO, IMC Ringdowns extended data analysis
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Sat Feb 15 12:56:24 2020, Yehonathan, Update, IOO, IMC Transfer function measurement
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Message ID: 15165
Entry time: Tue Jan 28 16:01:17 2020
In reply to: 15161
Reply to this: 15170
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| Author: |
gautam |
| Type: |
Update |
| Category: |
IOO |
| Subject: |
IMC WFS servos stable again |
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With all of the shaking (man-made and divine), it was a hard to debug this problem. Summary of fixes:
- The beam was misaligned on the WFS 1 and 2 heads, as well as the MC2 trans QPD. I re-aligned the former with the IMC unlocked, the latter (see Attachment) with the IMC locked (but the MC2 spot centering loops disabled).
- I reset the WFS DC and RF offsets, as well as the QPD offsets (once I had hand-aligned the IMC mirrors to obtain good transmission).
At least the DC indicators are telling me that the IMC locking is back to a somewhat stable state. I have not yet checked the frequency noise / RIN. |
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