Reports until 08:47, Tuesday 14 October 2025
H1 SEI (GRD, ISC)
thomas.shaffer@LIGO.ORG - posted 08:47, Tuesday 14 October 2025 - last comment - 13:23, Tuesday 14 October 2025(87462)
SEI_ENV node testing with High ASC gain testing

I went to test the high gain ASC states I made for SEI_ENV this morning while we were still locked this morning. The good news is that there were no errors in the code and it did exactly what I asked of it. The bad news is that we lost lock while transitioning back to a low gain state. This wasn't a great test though because I had a brain fart and forgot to change the thresholds for the test. The high gains were turned on, then immediately turned back. So I'm not entirely sure if the lock loss was from the transition back, or just the fact that we quickly flipped it back and forth. 

The major change between what SEI_ENV does and what the script the operators use right now is that the sleep timers between engaging/disengaging each loop are almost completly gone. At minimum for the next test it seems that we need some for the return back to low gain, or maybe increased tramps.

On the bright side, it looks like the structure of the node and the code seems to work, just need to tune it a bit. For now I've returned this node back to its normal operation, without the high asc states.

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ryan.crouch@LIGO.ORG - 13:23, Tuesday 14 October 2025 (87470)

It looks like we lost it from a big DHARD_P oscillation and it corresponds to CHARD_P gain increasing back to nominal right as the P filters are reset? I also made plots of the filter bits from Oli's filter history right click tool.

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