Reports until 20:26, Wednesday 13 March 2024
H1 AOS
elenna.capote@LIGO.ORG - posted 20:26, Wednesday 13 March 2024 (76366)
Trouble Locking from Input Alignment Change

Evan, Gabriele, Louis, Swadha, Elenna

After lockloss, we had trouble finding IR and I realized that we likely needed an initial alignment due to Craig's changes of the input pointing today. Running through input align was tough, so we held with Xarm IR locked and Evan walked IM4 and PR2 to the correct alignment. PRC align also needed some help, but the rest of the initial alignment completed well. We successfully locked DRMI with ASC. However, once we moved through the carm offset reduction, we lost lock twice in carm 5 picometers. It appears the alignment is not good on the AS air camera and the arms are not well matched. There are multiple saturation warnings when DHARD WFS comes on.

I think we should revert the IM1 and IM3 changes, and instead use the picomotors to correct the beam pointing on IM4 trans and the ISS array.