I have tested the engagement of MICH ASC in DRMI. I think the error yesterday was related to the WFS centering not engaging properly. MICH ASC set to TRUE in DRMI and the guardian is loaded.

Previously, we successfully locked to start TR CARM. I tried measuring a TR carm transfer function, but I am still getting no coherence. Sheila suggested I raise the TR CARM gain (normally 1). I doubled it, no coherence. I then tripled it, Sheila said she had been able to increase it to 10, but going to 3 caused a lockloss.

Caroline and Rachel found that the SRM damping gains were not set to -1, I must have missed this suspension when I increased damping gains. I SDFed SRM to have all the damping gains to -1.

I have successfully checked the error signals for PRC2 and INP1. Engaging those loops without PRC1 can reduce the buildups, so I engaged the loops and then moved PRM by hand. This helped me calculate the required offsets to POP A QPD that centers the beam and maximizes the buildups and also makes them very smooth and stable. This is SDFed. I then engaged PRC1.

Since these loops are all running stably, I set them to "True" in the guardian. Only SRC ASC is not engaged, so SRM and SR2 may need to be moved by hand.

The ASC plus hand alignment of SRM brings the POP18 to 157 and POP90 to about 17/18. I disengaged the mode hop offset with ASC engaged and everything held.

Offload DRMI ASC killed the lock twice, turns out this happens when MICH is switched from 45 to 36. This means something must still not be right with the AS 36 WFS, so for now I commented out the switch over to MICH to 36, so we won't have MICH ASC for CARM offset reduction right now. This is lines 1837 and 1838 in ISC_LOCK.

While in DRMI, I rephased AS A RF72 WFS using a SRCL line, putting it in Q phase. template, sdf

Attached is a screenshot of MICH, PRC1, PRC2, INP1 converged in DRMI with the buildups.

We have repeatedly locked now, engaged the ASC and been able to disengage the mode hop offset, so I set the guardian to disengage it as usual before the 3f transition. Guardian loaded.

Tagging opsinfo so operators know that once DRMI engages, the SRM and SR2 may need to be moved to follow the ASC and maintain the buildups (pop18 high, pop90 low).