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| 40m Log |
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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: 14690
Entry time: Mon Jun 24 08:12:10 2019
In reply to: 14688
Reply to this: 14691
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| Author: |
gautam |
| Type: |
Update |
| Category: |
IOO |
| Subject: |
IMC is locking normally again |
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Over the last 24 hours, the IMC autolocker was able to keep the MC locked ~60% of the time. This is not particularly good, but is an improvement on ~2 weeks ago when the IMC couldn't be locked.
There are two periods, which I've indicated by vertical cursors, between which the autolocker was doing something strange - usually this kind of trend is caused by one or more of the VME crates being unresponsive and the autolocker gets stuck, but I confirmed that both c1psl and c1iool0 are telnet-able. So I conclude that the stability and reliability of the IMC loop is still not as good as it used to be.
Note also that while the PC drive RMS level mostly hovers around 1 V, there are several excursions above that level. This in itself isn't a new phenomenon. I will do some more characterization by measuring the in-loop error signal spectrum and maybe the OLTF of the IMC locking loop.
| Quote: |
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Let' see how stable or otherwise the config is. I must've jiggled some poor cable connection back into a good spot while working on the PSL table? Or the NPRO decided to be less noisy on Sunday.
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