Reports until 14:40, Sunday 07 December 2025
H1 General
matthewrichard.todd@LIGO.ORG - posted 14:40, Sunday 07 December 2025 - last comment - 20:09, Sunday 07 December 2025(88406)
Untripping SUS WDs and turning on SR3 heater

M. Todd, J. Driggers


I wanted to turn on SR3 and watch the HWS while it heats up to compare to models of the defocus we expect.  Due to the earthquake yesterday however most of the suspension watch dogs had tripped, and would not let me re-align the ITMs, BS, and SR3 for making sure the HWS were aligned.

With Jenne's help, we untripped and took ISI's to isolated for ITMs, BS and SR3. I then turned on the SR3 heater to 4W, and I will watch to make sure it responds well. It should be relatively well thermalized in about 5 hours, at which point I'll turn it off.

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matthewrichard.todd@LIGO.ORG - 20:09, Sunday 07 December 2025 (88407)

M. Todd


I went back in to turn off the SR3 heater, and discovered that the watch dogs for the BS and ITMY had again tripped. I reset the watch dogs but was not successful in trying to put their ISIs to fully isolated because of an error 'WATCHDOG TRIP : SUBORDINATE'.

Regardless, the suspensions report that theyr'e aligned and SR3 is cooling down so the HWS should be able to get the cool down data as well.

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