TITLE: 07/21 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 51Mpc
INCOMING OPERATOR: Cheryl
SHIFT SUMMARY: The biggest trouble has been locking DRMI. PRMI locks easily, but DRMI has had trouble. Prior to the first observing stretch it would keep locking momentarily but not hold. I believe Kiwamu said he saw oscillations in the BS ASC YAW prior to it unlocking. Eventually it just happened to hold. He suggested playing around with the YAW gain for the BS oplev servo (H1:SUS-BS_M2_OLDAMP_Y_GAIN) the next time. Prior to the second observing stretch PRMI would again lock easily, but the StripTool traces stayed low and I could not improve them by moving the PRM or BS. DRMI seemed to have trouble catching lock at all. I played around with the BS oplev servo YAW gain, but found nothing conclusive. Eventually it locked again by chance.
LOG:

23:06 UTC Filiberto swapping BS M2 coil driver for a third unit. Earlier BS M2 coil driver replacement had a 20db gain modification not present in the original. Filiberto getting a third coil driver that does not have this modification.
23:19 UTC Filiberto back
23:22 UTC Starting initial alignment
23:37 UTC Powercycled video2
23:59 UTC Initial alignment done. Jenne had to increase gain on LSC path of X arm IR locking.
DRMI not locking. Locked PRMI. Lockloss during PRMI to DRMI transition.
01:03 UTC Observing
01:27 UTC Damped PI mode 28
05:14 UTC Lock loss
PRMI is locking easily, DRMI is not
06:06 UTC Observing
06:17 UTC Damped PI modes 27 and 28