With the vent and FMCS HVAC work can clearly see some variances on some oplevs (namely at the End Stations). First attachment are the Oplev Pit/Yaw/Sum 7-day trends.
NOTES:
- ETMx Pit has nose dived down and is currently more than -30 counts. (Yaw is still within "good" range.)
- ETMy Pit has been a bit all over during the last week, but is under +/- 30counts. (Yaw is nominal.)
- SR3 has had various steps in both Pit/Yaw over the last week. (updated edit: This is probably due to TCS HWS work).
- BS yaw was down at -80 (!) at the beginning of the week (2nd Attachment) and returned to nominal values on Monday (5/15). Pit has had no change & is nominal during this time.
EX Temperature Up 4-degF In Last 24hrs (5/17)! EY Took 4-degF Step Up On Mon (5/15) (see 3rd Attachment for 2-week temperature trend)
Apollo started controller work at EX 24hrs ago, and you can definitely see this on the ETMx oplev in Pit. The temperature sensors (the FMCS sensor went down during this work, but you can see the temperature variances with the Dust Monitors).
EY controller looks like it's back & I chatted with Apollo person in the Control Room and they hope to have the EX controller back tomorrow-ish/possibly today.
This closes FAMIS#4728.
Also note, the closing of GV1 and GV2 (now open) caused the ITMx and ITMy oplevs to get no return from the optic, so their pitch and yaw signals are invalid for the last week and their SUM has been near zero (seen on the above plots). Once we again have a locked IFO, I will evaluate which oplevs, if any, require re-centering. Due to HVAC work at the end stations and the vent work on ITMx I would not be surprised if at least these 3 oplevs require some re-centering.