aLIGO LHO Logbook

LHO General

corey.gray@LIGO.ORG - posted 08:20, Sunday 14 April 2019 - last comment - 10:01, Sunday 14 April 2019(48476)

Morning Status

TITLE: 04/14 Day Shift: 15:00-23:00 UTC (08:00-16:00 PST), all times posted in UTC
STATE of H1: Lock Acquisition
OUTGOING OPERATOR: Cheryl
CURRENT ENVIRONMENT:
    Wind: 7mph Gusts, 6mph 5min avg
    Primary useism: 0.03 μm/s
    Secondary useism: 0.37 μm/s

Low winds outside and useism about the same as it was yesterday morning (just under 90th percentile).
QUICK SUMMARY:

H1 had just dropped out before I walked in this morning. Cheryl noted there was an HSTS Verbal Alarm. ISC_LOCK was in READY state. Moved on with locking, but ALSy was not happy, so tweaked on ETMy & TMSy w/ arm unlocked to go from 0.3 up to about 0.9. After X & Y were locked with WFS, I tweaked up TMS for X &Y to take arms from about 1.0 to 1.1. Then moving on now.

LLO is approaching 20hrs of nasty weather, and Virgo continues to hum along at 50Mpc.

Comments related to this report

corey.gray@LIGO.ORG - 08:43, Sunday 14 April 2019 (48478)

Link

First attempt of locking:

Locked PRMI and mainly adjusted PRM to optimize.
Lockloss at PREP_ASC_FOR_FULL_IFO.
During next lock, went to lock all the way through, but halfway through noticed EQ approach (Japan 5.6 magnitude).
transitioned to EARTHQUAKE state...eventhough we do have high useism. Will stay in this state until the R-wave passes. (because we just dropped out at DHARD WFS.

corey.gray@LIGO.ORG - 10:01, Sunday 14 April 2019 (48479)

Link

Updates:

Transitioned back to WINDY (because EARTHQUAKE state moved ALSy too much). After 1-2 failed attempts made it through to NLN.
At NLN, have DIAG_MAIN notification for ETMY MODE 11, ringing up, but it is small and coming down (RMS value under 1, but Guardian does seem to come on every few minutes to put a gain ON for this path).
- The noisy culprit is ETMy Modes 1 & 6 (they were in the "yellow" on the SUS VIOLIN medm). Cheryl mentioned she and TJ had been addressing this over the weekend.
- Worked on MODE1 a little and able to decrease it's RMS value from near 5 (it is now down below 4 and continues a downward slope.
16:46 (9:46am) After violin mode tweaks have taken H1 to OBSERVING.
Winds have picked up a little (hovering just under 20mph).