Sheila, Camilla, Jennie + CR
After Jenne got AS port power back with large SR2/3 yaw offsets in 77388, Sheila wanted to check we could get our SQZ beam back to the power levels we had during the SQZ to OMC scan in 77213 (~75 counts on AS_A and AS_B NSUMs).
We revered ZMs (alignment and PSAMs), SRM, OM1, OM2 to that scan time: April 16th 19:10UTC. But in the old alignment we can only see ~10 on AS_A AS_B NSUM, plot from Sheila attached. So something has changed in the alignment in the SQZ to OMC path too: SQZ, ZM4,5,6, OFI, SRM, OFI, OM1, OM2.
From this old OMC-SQZ scan alignment, by pitching ZM5 200urad (sliders) we could get back to 75 on NSUM plot (AS_AIR beam too low off camera). OR by yawing ZM5 ~150urad (190urad on sliders/ 130urad on osems) we could get back to 70 on NSUMs plot (AS_AIR camera looks better).
Reverting PSAMs back to nominal.
Sheila, Camilla. Relooked at the times from the original SQZ_OMC scan (04/16) to the checked alignment back to this scan last week (04/24): when we moved ZM5 to increase power on AS_C, the alignment onto AS_C gets much worse, plot attached. AS_A/B can;t be trusted as much as the OM3_P is different. Today we translated he beam in yaw to investigate this, alog pending.
