Reports until 10:26, Thursday 20 March 2025
H1 General (Lockloss)
anthony.sanchez@LIGO.ORG - posted 10:26, Thursday 20 March 2025 (83465)
ISC_LOCK State NLN_ETMY[710] Lockloss

TITLE: 03/20 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Lock Acquisition
CURRENT ENVIRONMENT:
    SEI_ENV state: CALM
    Wind: 47mph Gusts, 31mph 3min avg
    Primary useism: 0.09 μm/s
    Secondary useism: 0.41 μm/s
QUICK SUMMARY:

H1 had reached Nominal_LOW_NOISE [600] at 16:09 UTC
Commissioning had started.
A button pusher accidentally pressed the NLN_ETMY[710] button on the ISC_LOCK screen.
There was enough time to pause and Look at the ISC_LOCK graph, to look for a way back to NOMINAL_LOW_NOISE[600].
The Graph has a path out of NLN_ETMY[710] to NEW_DARM[711], then to RETURN_TO_ETMY[712], then to DARM_RECOVER[713]. 
But since DARM_RECOVER[713] didn't have a path back o NLN[600] I thought we would still be stuck.
So I held us in NLN_ETMY for a few more moments while I checked the alog and found Ryan Short's alog76320 .
I then quickly pulled up an Ndscope to find that Ryan and company had lost lock and not returned back to NLN[600].
Other alogs that mention NLN_ETMY all mention locklosses. so that was our last well documented path out of NLN_ETMY.

There was some confidence building amongst the wealth of knowledge within the Control Room that we should manuel from NLN_ETMY[710] to BACK_TO_ETMX[561].
Since that was the intuition and consensus of the room full of knowledgable people we tried it.
This led us to be stuck in BACK_TO_ETMX and a LOG that said:
2025-03-20_16:25:29.616860Z ISC_LOCK [BACK_TO_ETMX.run] USERMSG 0: EX ESD bias is off.
2025-03-20_16:25:29.617144Z ISC_LOCK [BACK_TO_ETMX.run] USERMSG 1: EX ESD must be off. DARM not transitioned. HELP ME!!!!
And we then lost lock due to high winds.

In the Future, If you find your self in NLN_ETMY, maybe try DARM_RECOVER instead.
Relocking as been abismal.

Images attached to this report
Non-image files attached to this report