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Reports until 21:44, Monday 27 May 2019
H1 SQZ (SQZ)
georgia.mansell@LIGO.ORG - posted 21:44, Monday 27 May 2019 - last comment - 21:53, Monday 27 May 2019(49483)
Squeezer stuck at LOCK_CLF, fixed by init'ing the SQZ_MANAGER GRD

The squeezer got stuck trying to lock the CLF tonight. I thought this could be related to the low LO power at the CLF demoduator (see attached screenshot), but it looks like this level has been low for a while. Corey init'd the SQZ_MANAGER guardian and it locked the CLF just fine so we don't know what was actually causing the problem.

 

(We initially thought that since CLF_REFL_RF6_DEMOD was super low (-50) that we needed to align the ZM's but we were confusing the LO and CLF loops -- the RF6 was low because the beam diverter was closed and does not get opened until the next step in the locking sequence.)

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corey.gray@LIGO.ORG - 21:53, Monday 27 May 2019 (49485)

Attached are the SQZ guardian nodes & logs we had when the SQZ was having its issues.

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