camilla.compton@LIGO.ORG - posted 18:38, Tuesday 28 January 2020 - last comment - 22:30, Tuesday 28 January 2020(54786)
H1 back to Observing
following on from Jim's alog 54781. H1 had been down since 16:03 UTC for maintenance day and 7.7Mag EQ in Jamaica!!!!
- 00:31 Initial alignment repeated as couldn't lock PRMI, wondered if we completed the 1st initial alignment too early.
- 01:18 Paused at ENGAGE_AC_FOR_FULL_IFO to wait for signals to converge with Jenne and Sheila as previously had a lockloss from ENGAGE_SOFT_LOOPS believed to be because signals hadn't converged fast enough.
- 01:49 NLN and Observing
- SUS-IM1, 2, 3 SDF diffs accepted and attached. tagging SUS
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Following on from this concern, I have looked into the past 3 locklosses we have had from ISC_LOCK state 435 (ENGAGE_SOFT_LOOPS), and although they all had ADS_PIT5 hitting it's limit at -10 when they entered this state, that seems to be normal in successful lock acquisitions.
Attached are the ADS scopes from the past 3 locklosses from state 435 (labeled A, B, C) and scopes from successful locks through 435 (labeled S, T, U, V) where all but 1 of these has ADS_PIT5 steadily at hitting it's limit. I see no obvious difference in the scopes between successful and unsuccessful.
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