thomas.shaffer@LIGO.ORG - posted 07:32, Tuesday 18 November 2025 - last comment - 12:45, Monday 24 November 2025(88151)
Ops Day Shift Start
TITLE: 11/18 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Calibration
OUTGOING OPERATOR: Ryan C
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 4mph Gusts, 2mph 3min avg
Primary useism: 0.04 μm/s
Secondary useism: 0.46 μm/s
QUICK SUMMARY: Locked for 22 hours, SUS charge and PEM mag. injections running now. Maintenance today, then PEM measurements for the rest of the week, because....
I have updated the "o4" program for end of run.
O4 started: 2023-05-24 08:00:00.000000 PDT [1368975618]
O4 ended: 2025-11-18 08:00:00.000000 PST [1447516818]
now: 2025-11-18 09:36:41.000000 PST [1447522619]
O4A_START: 2023-05-24 08:00:00.000000 PDT [1368975618]
O4A_END: 2024-01-16 08:00:00.000000 PST [1389456018]
O4B_START: 2024-04-10 08:00:00.000000 PDT [1396796418]
O4B_VENT_START: 2024-07-17 11:52:00.000000 PDT [1405277538]
O4B_VENT_END: 2024-08-12 12:37:00.000000 PDT [1407526638]
O4B_END: 2025-04-01 08:00:00.000000 PDT [1427554818]
O4C_STARTGPS: 2025-06-11 08:00:00.000000 PDT [1433689218]
O4_END: 2025-11-18 08:00:00.000000 PST [1447516818]
DC0 is down now as part of the DAQ 0-leg upgrade. Its GPS EPICS channels was being used by many systems on the CDS Overview MEDM screen, resulting in a lot of purple boxes. I've switch these over to DC1 and restarted the nuc20 FOM. If you have purple boxes on your CDS Overviews, please restart them.
VACSTAT is currently in the "NOT OK" condition due to missing DC0. I'll upgrade it later when Jonathan gets identical frames on the frame writers.
The dates between Jan 25th 2025 and April 1st 2025 are "O4c part 1".
As shown on the JRPC wiki, which is meant to be our 'single source of truth' for run dates (although it's not especially well organized), O4b ended and O4c began during maintenance Tuesday on Jan 25th 2025. O4c.Part1 (the "part 1" is an unofficial name) ran until the vent break on April 1st 2025. O4c.Part2 (again, "part 2" is unofficial) ran from June 11th 2025 - Nov 18th 2025.