TITLE: 08/11 Day Shift: 1430-2330 UTC (0730-1630 PST), all times posted in UTC
STATE of H1: Aligning
OUTGOING OPERATOR: Oli
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 4mph Gusts, 2mph 3min avg
Primary useism: 0.02 μm/s
Secondary useism: 0.11 μm/s
QUICK SUMMARY:
H1 was down and trying to do an Initial_Alignment but saturating a number of suspensions, verbals warning about IFO_OUT from 14:17 UTC to 14:28 UTC so over 10 minutes of shaking the IFO OUT of the output arm.
I'm getting a persistent DIAG_MAIN message:
FAST_SHUTTER_HV: Fast Shutter HV not Ready
@ 1309 UTC Fast shutter channels:
H1:SYS-MOTION_C_SHUTTER_G_TRIGGER_VOLTS went to 3.877 V when it should have already dropped down to 0.5V or so.
H1:SYS-MOTION_C_SHUTTER_G_TRIGGER_POWER has increased to 1.9 mW when I'd expect it to go back down to 0
Both increased to levels that seem within the operational bound but not what their trends would suggest they should be operating at.
I cannot Close the fast shutter either.
H1:SYS-MOTION_C_FASTSHUTTER_A_READY says Busy.
Error Fault; Not Ready ; Not Closed.
Only CDS alarm this morning is the ongoing valved out PT343B at MX. I have extended its bypass to Wed.
Bypass will expire:
Wed Aug 13 08:05:06 AM PDT 2025
For channel(s):
H0:VAC-MX_X1_PT343B_PRESS_TORR
Earlier 6:08:34 UTC there was an 18V power supply that had stopped working which supplies power to multiple devices including the Fast Shutter infrastructure. The 18V power supply was reset and turned back on which should have powered back on the PZT driver that also gets power from the 18V supply. But the breaker on the back had been tripped.
It looks like shutter did close in that lockloss, which might have been caused by the power failure.
Attached are comparisons of a normal lockloss with that one.
