camilla.compton@LIGO.ORG - posted 12:34, Wednesday 07 October 2026 - last comment - 12:35, Wednesday 07 October 2026(92231)
IMC unlocking in DRMI Locking
Elenna noticed the IMC unlocked today during DRMI locked with the JAC staying locked. I couldn't see a reason for this, plot is attached. Light drops from MC2_TRANS as the PRCL loop changes significantly, but all upstream light (JAC) and JM3, MC1,2,3 optics seem stable. Maybe just the PRCL/DRMI loop dragging the IMC away.
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I think that this problem was actually due to MICH running away when being switched to WFS 36 in the offload state. This dragged away the DRMI which kicked the IMC. My apologies to the mode cleaner for the blame!