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Reports until 09:35, Saturday 01 July 2023
H1 SUS (SUS)
corey.gray@LIGO.ORG - posted 09:35, Saturday 01 July 2023 (70996)
H1 Violins Causing More Grief

We just had a lockloss during lockloss....more in separate entry.

While locking somewhat normally through ISC LOCK states, happened to look up and see H1 stuck at CHECK VIOLINS BEFORE POWER UP (H1 was at 2W).  As noted earlier, one could easily see (from early stages of locking) violins were rung up pretty bad.  This is a new scenario for me (I could have sworn we had this check at a later state....i.e. where Guardian would look at violins and hold until we violins damped down to a safe value before powering up). 

At this state, there was no violin damping via guardian.  So I was looking through the violin damping materials, to find a starting place.  From this table, I tried to start here, but this table does not cover every mode (i.e. ETMY mode8 was really rung up, but I didn't see any entries for it).  So I moved on to an entry and then tried settings for 2W (i.e. ETMy mode1).  Unfortunately, this did nothing, or it started ringing up this mode. 

I then went to the VIOLIN DAMPING guardian to go from the TURN OFF DAMPING ALL  ----to-----> ENGAGE DAMPING 2W.  While in the 5min sleep, there was a lockloss (which I'm suspecting was a power glitch).

This is going to be a lovely shift.

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