camilla.compton@LIGO.ORG - posted 12:40, Saturday 15 February 2020 - last comment - 15:04, Saturday 15 February 2020(55117)
H1 Lockloss 20:16 UTC
Unexplained lockloss. Winds at 20mph, microseism 0.54 μm/s.
No oscillation in PSL channels like TJ saw earlier his week, however there is a spike in ETMX L3 output channel 1 second before lockloss (see red bottom left trace in attached plot). There have been a few cases of a spike in L3 then lockloss (2020-01-20 00:10:04 and 16:09:51 UTC). Looking at the oplevs and osem_wit channels, it seems like the suspensions aren't actually moved with the spike but I haven't worked out it's source.
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With winds up to 45mph and a small EQ from Alaska I have had trouble relocking, started initial alignment at 22:52 UTC.