ryan.crouch@LIGO.ORG - posted 11:28, Thursday 02 May 2024 - last comment - 11:53, Thursday 02 May 2024(77574)
Lockloss at TRANSITION_DRMI_TO_3F
18:21 UTC, SRM saturation then LL. The ASC loops were not done working when GRD advanced us to turn on BS_STAGE2
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I think what happened here was that the ASC had not converged before the guardian moved on, and probably the BS ST2 glitch caused the lockloss. (I haven't looked into this).
It would be great for someone to look carefully at the timing of this lockloss, compared to the BS glitch. It would also be good to compare this to a lock when we survive the BS glitch, (the next one), to see if there is a difference in the alignment signals or build ups that we could use as a check for the automation.