TITLE: 04/16 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC STATE of H1: Observing at 106Mpc INCOMING OPERATOR: Niko SHIFT SUMMARY: Another rough night for locking. I could not get to PRC_ALIGN at all in initial alignment, despite being able to lock PRMI in the regular lock sequence with little trouble. I tried twice. I also had quite a lot of trouble locking DRMI, despite stopping at LOCK_PRMI and moving the BS and PRM. LOG: 23:04 UTC Lock loss 23:26 - 23:33 UTC Robert to LVEA to turn on amp 23:50 - 23:55 UTC Sheila to LVEA to check that phone is unplugged 23:51 UTC NLN PEM running injections 00:46 UTC PEM injections done 00:56 UTC Observing 02:14 UTC Lock loss PEM group moving equipment during relocking 03:13 UTC NLN Reverted SDF differences PEM group running excitations 03:38 UTC Lock loss Starting initial alignment 04:26 UTC Can't get PRC to lock. Giving up on rest of initial alignment. 04:46 UTC DRMI not locking, despite locking and improving PRMI. Trying initial alignment again 05:11 UTC Still can't get PRC to lock. 05:15 UTC Giving up on initial alignment again. 05:58 UTC Observing.
The reason that Patrick had trouble locking PRX (for PRC alignment) last night is that I calibrated the REFL A 9I signal inot volts thinking that it was not used anywhere for feedback, but it is used in PRX.
I've changed the gain for PRX in lscparams to compensate for the calibration change I made last night.
Apologies, and thank you to Patrick for following up.