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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: 14653
Entry time: Tue Jun 4 10:56:31 2019
In reply to: 14647
Reply to this: 14659
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| Author: |
gautam |
| Type: |
Update |
| Category: |
IOO |
| Subject: |
IMC diagnostics |
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I briefly managed to lock the IMC today - it stayed locked for ~10 minutes. Attachment #1 shows spectra of a few error and control signals for today's lock, and from a stretch yesterday before the problems surfaced*. The 60 Hz lines are much bigger, and MC_F signals broadband excess noise above a few Hz. I suspect a problem somewhere in the electronics.
*I confess the comparison isn't entirely valid because I had to tweak the FSS FAST gain from its nominal value of 22 to 25 in order to get the PC drive RMS down to the ~1.5V level. At the nominal gain setting, with the laser frequency locked to the cavity length, the PC Drive RMS was ~4 V. Still, indicative of something being off in the electronics. |
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