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Mon Jun 3 16:46:31 2019, gautam, Update, IOO, IMC not locking
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Tue Jun 4 10:56:31 2019, gautam, Update, IOO, IMC diagnostics
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Thu Jun 6 22:11:53 2019, Koji, Update, IOO, IMC diagnostics
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Thu Jun 13 18:01:18 2019, aaron, Update, IOO, IMC diagnostics
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Fri Jun 14 13:10:00 2019, aaron, Update, IOO, IMC diagnostics
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Mon Jun 17 12:37:16 2019, aaron, Update, IOO, IMC diagnostics
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Tue Jun 18 20:35:07 2019, aaron, Update, IOO, IMC diagnostics
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Wed Jun 19 19:12:51 2019, aaron, Update, IOO, IMC diagnostics  
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Mon Jun 24 15:49:05 2019, aaron, Update, IOO, IMC diagnostics
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Tue Jul 2 19:36:18 2019, aaron, Update, IOO, IMC diagnostics 
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Fri Jun 21 19:36:26 2019, Koji, Update, IOO, IMC diagnostics
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Sun Jun 23 08:09:53 2019, gautam, Update, IOO, NPRO diagnostics   
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Sun Jun 23 09:36:32 2019, gautam, Update, IOO, IMC is locking normally again
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Sun Jun 23 14:43:14 2019, Koji, Update, IOO, IMC is locking normally again
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Mon Jun 24 08:12:10 2019, gautam, Update, IOO, IMC is locking normally again
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Mon Jun 24 11:48:35 2019, gautam, Update, IOO, IMC in-loop error spectra and OLTF  
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Message ID: 14647
Entry time: Mon Jun 3 16:46:31 2019
Reply to this: 14653
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Author: |
gautam |
Type: |
Update |
Category: |
IOO |
Subject: |
IMC not locking |
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Since ~ 2 hours ago, the IMC autolocker has not been able to keep the IMC locked. I don't see any obvious trends in the wall StripTool that may point to what's going on. For the brief periods in which a TEM00 mode is locked, the PC Drive RMS level is ~5x what the nominal level is, and while the autolocker is trying to lock the IMC, the PC drive RMS level is hovering around 4V DC, which is high. The PMC Error and Control signal spectra show huge 60 Hz (and harmonics) peaks, and indeed this is visible in the time domain signals as well (on ndscope or on the oscilloscope on the PSL table), but this is not a new feature in the last two hours. Usually, this kind of problem signals that either/both the c1psl or c1iool0 slow machines need to be power-cycled, but I confirmed that both machines are online and telnet-able. Possibilities: (i) some card in the c1psl / c1ioo crates have failed or (ii) something in the MC/FSS electronics chain has failed or (iii) there is a huge amount of excess high-frequency noise from the NPRO.
I am leaving the PSL shutter closed. |
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