Reports until 16:07, Tuesday 28 October 2025
H1 SEI (ISC, OpsInfo)
thomas.shaffer@LIGO.ORG - posted 16:07, Tuesday 28 October 2025 - last comment - 13:56, Thursday 30 October 2025(87788)
SEI_ENV node testing with High ASC gain testing Rd 2

Summary

Round 2 of testing the guardianization of turning on and off the high ASC gains (Round 1 - alog87462). SEI_ENV will now automatically move us into the high gain ASC state when a.) we are in the earthquake state b.) there is an incoming or ongoing earthquake that is at or below the dotted line on the "rasta plot"The transition takes 11 seconds to complete, and it will transition back when the ground motion is low enough to bring us out earthquake state.

Details from today

I started testing with a few 10 and 5 second waits between steps, just as is done in the script that we currently use. Once those ran successfully a few times I started to decrease the wait times between steps. Eventually, I had success transitioning all the ASC at the same time, then the FF 10 seconds after. since this was the same configuration that I had last time I tried this, tried to reporduce the lock loss by requesting the High ASC state, then immediately requesting the Low ASC state. This did, again, cause a lock loss. To avoid this I have a wait timer in the High state so it won't switch quickly from one to the other.

Transitioning back out of the high ASC state has the same thresholds as the earthquake state currently. We didn't want to transition back and then have to do it all over again, or wait in earthquake for another 10 minutes for it to calm down. We might make this a bit shorter or smarter after we've seen it work a few times.

Time (hhmmss UTC) Transition to Notes
150251 High 10/5s timers
150457 Low 10/5s timers
150616 High Repeat of above
150724 Low Repeat of above
150754 High 1/5s timers
150930 Low 1/5s timers
151113 High All ASC engaged at once
151218 Low All ASC engaged at once
151326 High All ASC engaged at once
151340 Low Lock loss

 

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thomas.shaffer@LIGO.ORG - 13:56, Thursday 30 October 2025 (87863)OpsInfo

I forgot that this would eventually trigger IFO_NOTIFY if the high gain state were to keep us out of Observing for longer than 10 minutes while IFO_NOTIFY was running. I've changed IFO_NOTIFY to not notify when the SEI_ENV node is in the high asc or transition states.