TITLE: 05/31 Eve Shift: 2330-0500 UTC (1630-2200 PST), all times posted in UTC
STATE of H1: Planned Engineering
INCOMING OPERATOR: Tony
SHIFT SUMMARY:

IFO is in DOWN for PLANNED ENGINEERING. We were able to get to POWER_10W, losing lock at ~18W.

An extremely productive day in which we babied IFO, carefuly and cautiously watching POP signals and ASC whilst moving suspensions.

The steps we did on shift - Each of these were done multiple times throughout the shift with small variations. See alogs 84680 for more details.

Manual Initial Alignment: Mostly automatic but we had to stop at PR_X and move PRM by hand while lookign at AS_C signals. Once this was maximized, we could move on to MICH Bright. Once done, we moved onto normal locking.

ALS Locking: Manually done but arms easily catch. We were able to get far enough (~ENGAGE_SOFT_LOOPS) in alignment to set the green references. After our following LL, green arms were automatic.

PRMI/DRMI: Mostly automatic to lock but had to touch up with at OFFLOAD_DRMI_ASC, CARM_5_PICOMETERS and PREP_ASC_FOR_FULL_IFO

ASC: At this point, Georgia instructed to pull up the ASC signals and watch the error signals as they converge. I learnt how to do this and turn off the rail limiters. Slowly, I iterated between moving PRM and SRC to maintain good POP18 and POP90 and moving specfic PR and SR mirror DOFs to zero the error signals. After this was done, CHARD_Y was still insufficinetly far from zero so I was shown how to use the move_ARM_dev.py and what acceptable step magnitudes looked like. We walked CHARD_Y back to zero whilst looking at all the other signals includiong POP (iterating and remax/minning when appropriate). Once alignments looked good, we went through ENGAGE_ASC_FOR_FULL_IFO successfully. We were able to move automtically until DAMP_BOUNCE.

ADS: We still had a pervasive ADS PIT3 Pitch (shakes IX and points with PRM) in DARM (now lower than I had seen it in months). Craig manually went through A2L gain just for P IX Center (alog 84683). This managed to temporarily dissappear the ADS noise and we held our breath and went onwards.

POWER UP: We clicked POWER_10W and made it successfully. We waited 30s before moving forth to POWER_25W. We got to around 18W before losing lock. Before this, we saw the PR_GAIN dip and the CHARD_P ASC loop walk away and oscillate unstably. Lockloss.

We're going back up now and so far so automatic. Syracuse crew, particularly Georgia, were extremely instructive, teaching me how to lock and move forward as comissioners have done this week.

Other:

Erik showed me how to cycle the control room internet, which turned off twice randomly for unknown reasons today. They're monitoring and I'll be on-site tomorrow to respond if anything happens in that regard.

LOG: