TITLE: 04/28 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
SHIFT SUMMARY:
Main Notes:
- LVEA is LASER HAZARD until at least Monday morning
- IFO is in Observing mode as of 06:47 Apr 29th UTC
- Lock #1:
- Held at ENGAGE ASC since ADS PIT/YAW 3 were not converging whatsoever
- Elenna tried doubling the gain on the ADS filter to no avail, she then tried turning off the loop and aligning PRM with the intention of turning back on the loop
- No luck, so tried aligining REFL using IM4 and PRC2 using PR2
- LOCKLOSS @ 0:23 UTC - possible alignment being too far off
- Lock #2:
- LOCKLOSS @ 0:25 - LOCKING ARMS GREEN, unknown reason
- My cue to start an initial alignment
- Lock #3:
- This lock went fairly well, acquired NLN @ 01:56 UTC
- Do have a "Diffracted power low" on DIAG_MAIN for the PSL
- Took a look and the AOM Diffracted Power is ~1.35% - not sure what this value is, nominally
- There were differences in the observe SDFs preventing me from going into Observe but after talking with commissioners, they have been reconciled - Screenshots attached
- IN OBSERVING: 02:59 UTC
- EX saturation @ 04:41, no ringups on ASC but do see a glich/spike on the OAF BLRMS screen for all bandpasses and DCPD saturations went bonkers for a second - glitch?
- LOCKLOSS @ 04:44 (DCPD saturation on verbal), shortly after, probably due to whatever caused the glitch above
- Lock #4/5/6:
- Had to touch ALS DIFF just a hair to catch IR
- LOCKLOSS @ 05:19 ACQUIRE DRMI, then again at LOCKING_ALS, then again at LOCKING_ALS...
- Lock #7:
- GRD was able to do most of the heavy lifting but still noticing that the ADS PIT/YAW 3 going off the rails when we get to ENGAGE ASC - but after awhile it calmed down and started to converge
- Acquired NLN @ 06:20 UTC
- IN OBSERVING: 06:47 UTC
Other Notes:
- Upon finishing an initial alignment, ISC LOCK went into ERROR - see screenshot
- Error in the CHANGE_POL state - claimed that the value incflashes_time was not defined, when in actualality, it was instantiated on line 962 of ISC_LOCK
- No idea why it's not seeing that, so I'm temporary setting the error variable to an integer value of 120 (the value of incflashes_time) for now - Tagging ISC
- The ALS GRD went through CHANGE_POL and in doing so created an Observe sdf diff in SYSCSAUX, the channel in question was just a step size so I vote we unmonitor this channel (and channels alike) so we don't run into it in the future
LOG:
| Start Time | System | Name | Location | Lazer_Haz | Task | Time End |
|---|---|---|---|---|---|---|
| 19:56 | LVEA | LASER HAZARD | LVEA | YES | THE LVEA IS LASER HAZARD | 10:54 |
| 22:59 | CAL | Elenna | CR | N | Test new HAM1 FF loop | 23:17 |
| 23:35 | ISC | Elenna | PSL racks | YES | Switch SR785 for CARM sensing | 23:44 |
