patrick.thomas@LIGO.ORG - posted 08:03, Wednesday 25 January 2017 - last comment - 14:35, Wednesday 25 January 2017(33622)
Ops Owl Shift Summary
TITLE: 01/25 Owl Shift: 08:00-16:00 UTC (00:00-08:00 PST), all times posted in UTC STATE of H1: Observing at 64Mpc INCOMING OPERATOR: Ed SHIFT SUMMARY: Very quiet night. I restarted video1 to run the updated vacuum overview medm screen. H1IOPASC0 reported a timing error, Ed has reset it. LOG: No events logged.
Thanks for noticing Patrick. This is related to the Guardian Pringle loop changes TJ and I did yesterday. I am surprised the HPI Guardian is complaining as we changed the guardian and used the guardian to reisolate the platform. The SPM diffs should clear safely with an INIT but maybe best to wait until a lock loss to do that. The INIT should not trip the platform but I'd like to understand why there are SPM diffs. Maybe if the platform is reisolated using the SEI Guardian rather than the HPI. I've asked the operator to let me know if there is a lock loss so this can be addressed: when the light is green the trap is clean!
The IFO Broke Lock ~2220utc, HAM6 ISI tripped too on Actuators (Shutter Fire.) Ran Guardian INIT on HPI, again, and then on SEI Guardian but these did not clear the SPM diffs. Untripped the ISI and the SEI Manager brought the ISI back up. SPM diffs remain. Executed INIT again on SEI but this did not clear the SPM diffs. Took SEI down to READY (deisolating ISI and HEPI.) SEI Guardian then brough HPI and ISI back to Isolated and SPM diffs are gone. Good things these aren't in Observing bit.