TITLE: 06/18 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
INCOMING OPERATOR: Oli
SHIFT SUMMARY:

IFO is LOCKING in OMC_WHITENING

Productive shift in which we had commissioning until 2PM. We were locked for the majority of commissioning, only losing lock in the morning (lockloss alog 85151). We reached NLN after doing an initial alignment (manual as is the case until PRX can be automated) at 16:49 UTC.

Relevant alogs from commissioning:

• A2L Script Alog 85155
• SQZ ASC Comissioning: Alog 85149
• Guardian Reboot (fixing AWG issue): Alog 85152
• DC6 P Noise Budget Injection: Alog 85156
• Elenna SDF Diff Reversions: Alog 85158
• HAM1 ISI FF: Alog 85162

After commissioning, there was another lockloss (a few minutes into observing) where a mysterious length kick on the Y arm seems to have been the cause - Lockloss alog 85160.

Relocking was somewhat difficult (and is still in progress) primarily due to ALSX losing lock. Firstly, scan-align failed to lock ALSY despite counts over 1. A manual movement of 3 taps in EY P immediately fixed the problem. Secondly, scan-align engaged immediately after ALSX lost lock despite counts being ~1 (very good for ALSX). After this, ALSX stalled in “crystal frequency” locking for 20 minutes. If this keeps happening, we can change the threshold for the crystal frequency sweep since it seems to be only 1% away from threshold. After we got past this, DC0 had an error and Erik and Dave fixed it within 10 mins with no disruptions. Alog 85164

Otherwise, locking has been automatic and reliable. This just in: EQ incoming - velocity over 1 um/s means we’ll probably lose lock.

LOG: