Reports until 22:12, Wednesday 21 August 2024
LHO General
corey.gray@LIGO.ORG - posted 22:12, Wednesday 21 August 2024 - last comment - 11:48, Thursday 22 August 2024(79633)
Wed EVE Ops Summary

TITLE: 08/21 Eve Shift: 2300-0800 UTC (1600-0100 PST), all times posted in UTC
STATE of H1: Corrective Maintenance
INCOMING OPERATOR: Ryan C
SHIFT SUMMARY:

H1 made it to NLN just a few minutes after Elenna left this evening. The range is not great (~55Mpc), but H1 is at NLN (there are still noise sources on the floor due to VAC work which needs to be done. HAM7 and the rest of the Filter Cavity downstream is still valved out from the main volume (so there is also backscatter noise from the relay tube blocking light and gas from entering the Filter Cavity).

Other notes:

WFS for the Y-Arm has not worked all day.  The ALSy Auto Centering AUTO state did not seem to work (it's a red box onthe ALS overview).  Clicking the Force button would turn on the WFS, but they would drive off the alignment. 

For locking, Because of the above, we were not able to run an Initial Alignment (but a Manual Alignment worked for all the other states...except for green arms).

Work still remains to be done for the ASC SRC loops.  Elenna was able to get through this and work on it by changing SRC offsets. 

Violin modes were rung up, so while Elenna was working on H1 I worked on violin mode damping.  Managed to get all the violin modes into the GREEN (except for ITMy's pesky M5/6 which are currently down to YELLOW from ORANGE).

For overnight, will select H1 to stay DOWN when it loses lock.....and it appears it's going to drop out soon.  H1's PI Mode 24 is currently ringing up.  (SUS_PI was in the IFO_DOWN state, so the PI Modes rung up.  I've taken it to PI Damping, but it's looking like it's too rung up to be damped.

Attached are screenshots of the SDF diffs we had when we made it to NLN.

LOG:

Images attached to this report
Comments related to this report
corey.gray@LIGO.ORG - 22:36, Wednesday 21 August 2024 (79639)

Left headlights on with my Jeep, so had to jumpstart it.  Before leaving the site, I see that PI24 is slowly coming down now.  (so yeah, H1's still locked!)  :)

camilla.compton@LIGO.ORG - 11:48, Thursday 22 August 2024 (79644)

SUS_PI gets requested from 'DOWN' to 'PI_DAMPING' in ISC_LOCK state INJECT_SQUEEZING, which was skipped over last night, hence Corey needing to turn it on!