Louis and I spent the day working on getting MICH ASC running in DRMI.

First, we phased the AS RF36 WFS to maximize a BS length line in Q. Attached are screenshots. Louis and I found that for each 36 WFS, one segment was 180 deg out of phase of the others and needed a sign flip.

Next, we set out to find a good error signal for MICH P and Y. This was very easy for P, once we had the signals phased, we could see clearly that AS B RF36 crossed zero at the buildup max and moved appropriately with BS movements. We engaged the loop and saw the buildups improve and stabilize. We chose an input matrix value of 0.1 for AS_B_RF36 P. We engaged with an overall loop gain of 0.5, which is what Keita and I had set for PRMI.

Unfortunately, there is not a clear winner for MICH Y error signal, so we might need to combine a few signals to create a good error signal. Louis is going to work on a full sensing matrix.

However, we lost lock so we used this opportunity to go to PRMI and measure the MICH loop gains. We got a MICH P measurement, and the loop is very slow, sub 0.1 Hz. The design is for a 2 Hz loop, which would require a gain of 15. We bumped up the gain, but we're not sure if we want the loop to be this fast in PRMI. I put the gain back down to 0.5 for now, we can decide later if we want this loop to be faster in PRMI. The screenshot attached shows MICH P with gain of 15 in PRMI.

MICH ASC is still False in DRMI because we only have one of two working loops.

Other notes:

• the alignment has to be very good in DRMI to avoid SRCL mode hopping. hard to make this happen
• edited ISC DRMI guardian to disengage Not88 filters for sensing matrix in FM4 of all [LSC]2 banks, since they had been left on accidentally