Reports until 13:10, Tuesday 09 December 2025
H1 General
anthony.sanchez@LIGO.ORG - posted 13:10, Tuesday 09 December 2025 (88441)
Maintenance Tuesday Update.

TITLE: 12/09 Day Shift: 1530-0030 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Planned Engineering
CURRENT ENVIRONMENT:
    SEI_ENV state: USEISM
    Wind: 21mph Gusts, 17mph 3min avg
    Primary useism: 0.04 μm/s
    Secondary useism: 0.45 μm/s 
QUICK SUMMARY:

DEC 8 - FAC - annual fire system checks around site : In Progress
MON Tues - RELOCKING IFO : In Progress
TUES AM - HAM7 Pull -Y Door : Completed
FARO work at BSC2 (Jason, Ryan C) : Post poned in favor of Locking? 
HAM7 - in-chamber work to swap OPO assembly : In Progress.

All other work Status is currently unknown.
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Notes:

Fire Alarm went off at 16:58 UTC 
HVAC system down Temperature will climb everywhere says Tyler @ 17:15 UTC
HVAC Fans turn back on @ 17:18 UTC Tyler says Air handlers are back on line , should be just a little Blip in temp.

Tumbleweeds at EY piled up too high to access EY. Chris has since cleared this.

Fire alarm in MSR going off @ 18:07 UTC

Initial Alignment process: 
Held ISC_LOCK in Idle
Forced X arm to get locked, Moved ITMX to increase the Comm beat note, then Offloaded it.
When we tried for an initial Alignment we skipped.Green arms in Initial alignment.
Pushed PRM to get locked while we were in PRC align. 
Pushed BS when Mich_bright aligning. 
Pushed SRM to help SRC alignment.

Locking: 
Jumped straight to Green Arms Manual and aimed for Offload_DRMI_ASC. 

Jenne D. by hand Offloaded a "PR2 osem Equivelent", during one of out locks that got DRMI locked but locklossed at Turn_On_BS_Stage2. 
another LL at Turn_On_BS_Stage2. 

We made it past Turn_On_BS_Stage2 when Jenne D. Told PRC1 & SRC1 to not run in ASC. 
H1 has been losing lock at a number of places before power up.