TITLE: 08/25 Eve Shift: 23:00-07:00 UTC (16:00-00:00 PST), all times posted in UTC
STATE of H1: Observing at 162Mpc
INCOMING OPERATOR: Tony
SHIFT SUMMARY:
- EX saturation @ 11:10/1:48/2:13 UTC
- Lockloss @ 5:56 - new record for a O4 lock at LHO - 60:29!
- Issues getting light on the ALS Y PD - might be related to the chiller issue we had earlier today?
- Attached witness sensors and slider values over the course of the past day - does not seem to be much drift (the most recent movement was from me trying to find light on the PD)
- The ALS Y guardian is showing a ReflPD A/PDH error
- Looking on the trouble shooting wiki, Tony and I tried running the dither align script (under TMS pointing/dithering) to try and get some power on the PD - no luck
- Attaching oplevs - looks like there is movement/drift - mostly in pitch - scope attached
- Tried moving the sliders back to their original oplev positions from ~2 days ago - still no light
- Followed Camilla's steps here, found in the wiki to be used "if there is no image on the ALS camera", still no luck
- At this point, we're out of ideas and will be contacting a commissioner to help troubleshoot, stay tuned for a further alog
LOG:
No log for this shift.
ALSX-REFL_A_DC
Has no voltage and low power.
Running the Dither Align script on TMSX and ITMX in hopes that it would fix the issue with ALSX ReflPD A
It did not.
I still have an issue with ReflPD A And PDH.
To get the X are ReflPD A issue resolved.
I had initially thought that is was something that wasn't getting power or voltage, but since I was able to close the shutter and see a change in H1:ALS-X_REFL_A_DC_POWER, I realized that everything is indeed working correctly, it's just very poorly aligned.
I tried, rolling back to a few hours ago before oplevs had moved about 4 hours prior.
I Tried baffle dithering twice, following both this https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=62024
and the Dithering instructions found here: https://cdswiki.ligo-wa.caltech.edu/wiki/Troubleshooting%20the%20IFO
This made the flashes I was seeing brighter, but it was still too low for the REFLPD A error 8 to be resolved.
I drove to site so I can get my eyes on the how everything was behaving, and so I can have more screen real estate to see some more trends.
Trending ISC_LOCK back to the last Initial_Alignment gave me a GPS time of 1376843785 or so. Once I got that I put all of the ETMX, ITMX & TMSX back to that location.
I then started an Initial alignment. Stopped Initial alignment are SRC align, and followed trhough walking through initial alignment
Locking Started at 10:46 UTC
Had to accept this SDF to get to observing.
Observing Reached !!!
