aLIGO LHO Logbook

LHO General

corey.gray@LIGO.ORG - posted 07:57, Tuesday 01 October 2019 - last comment - 08:32, Tuesday 01 October 2019(52224)

OWL Operator Summary

TITLE: 10/01 Owl Shift: 07:00-15:00 UTC (00:00-08:00 PST), all times posted in UTC
STATE of H1: Observing at 117Mpc
INCOMING OPERATOR: Niko
SHIFT SUMMARY:
BRSx continues to NOT be used.

O3A is officially COMPLETE! (& we had plenty of people checking to see if H1 would break lock early, but it held up until 8am!)

LOG:

MX Low temperature alarms continue.
11:53:49 HUGE glitch (aka "DCPD" on Verbal) which was above the ADS lines for quite some time...so was pretty sure it would be a tough one.
11:54:05 Lockloss
LOCKING#1 (11:55-12:04)
- Both X & Y green arms were misaligned and required (mostly pit) tweaks for both ETMs.
- Accidentally caused lockloss by runnin an INIT on CHECK MICH FRINGES (didn't know that would take it DOWN). Since DRMI had been looking ugly for previous locks, thought I'd check the BS & PRMI first. Oh well---Lockloss caused by user/operator error on this one.
LOCK#2 (12:07-12:39)
- Check Mich Fringes was still a little rough to use (I'm used to it being locked on a fringe and the AS AIR video clearly showing where to take the BS), but eventually was able to figure out where to steer the BS (had to wait for BS to flash to give an idea of which way the BS was misaligned). This state is usable, but not as easy as I'd seen it previously.
- PRMI locked up fairly fast. For DRMI, I tweaked the SRM in pit to try to help with locking...whether that helped is a judgement call.
- Lockloss at ENGAGE ASC
LOCK#3 (12:40-13:21)
- Went directly to DRMI. Hung out at PREP ASC for a few minutes and then moved on to NLN.
13:21 Observing
14:12 Apollo in Control Room to work on FMCS computer for MX HVAC
14:24 Apollo doing HVAC work at MX & then MY
14:46 PEM Injection started. Out of Observing (Had a Segmentation Fault for 1st attempt, but it worked on 2nd attempt...Jeff might post text for the fault)
14:46 Observatory Mode to PLANNED ENGINEERING

Comments related to this report

corey.gray@LIGO.ORG - 08:32, Tuesday 01 October 2019 (52227)DetChar, ISC, Lockloss, OpsInfo

Link

Reconciled ISC SDFs after intentional lock loss in prep for O3 break.
J. Kissel

AS_A Accepted new whitening settings that Evan installed LHO aLOG 52171. (see first attachment)

The following channels appear to be set upon entrance in to nominal low now, or somewhere along the way, but the behavior during acquisition appears to have changed on Sept 26/27 2019. Probably related to LHO aLOG 52150, so I'm accepting them as is: 
    H1:IMC-MCL_FM_TRIG_THRESH_[ON/OFF]
    H1:LSC-MCL_FM_TRIG_THRESH_[ON/OFF]
    H1:LSC-DARM_FM_TRIG_THRESH_[ON/OF]

H1:LSC-TRIG_TRX_10_17 Accepted as 0.0. Has been so since September 26 2019. Appears guardian controlled. This is the POP A_DC OUT to IFO_TRIG matrix element in the trigger matrix.
(see second attachment)

Of course, in the rush to get everything started, folks started chning things that are not related to the standard DOWN state, so I capture whats left in the state we're in now, 30 minutes after the start of the break:
    SQZ system is OFF. (That's the 10 CS_ECAT_PLC4 diffs)
    TCS lasers are keyed OFF (That's the 2 TCSCS diffs)
    The IMC is OFFLINE (That's the two SUSMC2 diffs)
    The ISI BS is in its usual ISOLATED DAMPED state (that's the 23 ISIBS diffs)
    The SUSPRM and SUSSRM have the usual confusing problems with the coil driver switching state (this is a known bug)
    HEPI HAM6 has been brought down such that it can be physically locked and put on its stops.

Images attached to this comment

corey.gray@LIGO.ORG - 08:23, Tuesday 01 October 2019 (52229)DetChar, PEM

Link

PEM Injections Seg Fault
J. Kissel

While the second attempt was successful, the first attempt at running the regular PEM injections failed due to seg fault. I attach the text of the errors dumped to the command line.

Non-image files attached to this comment

2019-10-01_PEMInjection_SegFault.txt