I locked us in PRMI and checked the POP X phasing (PRC1 sensor in PRMI). I drove a PRCL line and phased POP X to put the signal in I phase. Screenshots attached with SDF.

Then, I moved PRM and watched the buildups and POP X I signals. I saw that the signals crossed zero as expected. I engaged PRC1 and the loops converged and buildups maximized. As a final check, I also ran the MICH loop and saw that both loops converged.

Yesterday, I rephased all the WFS using the X arm IR, including some poor phasing in the AS 45 WFS segments, 92179. I rechecked the response of MICH in the AS B RF45 Q signals in DRMI lock, and it looks great, signals cross zero and maximize the buildups. Therefore, we can use the same MICH sensing matrix in DRMI as in O4.

However, when I went to engage the MICH loop, we had a lockloss so I probably have a sign wrong somewhere. I will check up tomorrow.

Use MICH and PRMI are now both TRUE in PRMI. All loops are still FALSE in DRMI, but I am optimistic that with the proper phasing, we can close most of them at the next opportunity. Guardians loaded. Note, this means PRMI ASC can run without any operator intervention.

Unrelated, we had a lockloss due to the IMC dropping out (but not the JAC!), don't know why. Tagging IOO for FYI.