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Reports until 10:54, Thursday 16 July 2026
H1 PSL
jason.oberling@LIGO.ORG - posted 10:54, Thursday 16 July 2026 - last comment - 11:35, Thursday 16 July 2026(91066)
PSL Recovered After Power Outage

J. Oberling, R. Short, P. Thomas

We have recovered the PSL after this morning's power outage.  Once again, the PSL software did not autostart so Patrick was called in to get things up and running.  The system calibrations were all correct this time EXCEPT for the operating hours; we trended these to the time of the power outage and updated them manually (the OPHRS A, or the total system uptime, are still incorrect as this field is not updateable and we lost it over multiple failures of the system to retain the calibration settings).  I've attached a picture of the current settings screen.

The PMC relocked without issue, although it is running a little cooler than usual ( ~304.5 K vs ~306.0 K).  We'll monitor this as the system thermalizes and change the PMC temperature if necessary.  The FSS RefCav also locked without issue.  We have left the ISS off while the system thermalizes, please do not turn it on until things have settled down (hopefully by the end of the day).

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keita.kawabe@LIGO.ORG - 11:35, Thursday 16 July 2026 (91068)

refcav temperature seems to be good as of now. I readjusted the fiber polarization controller and ALSX PLL relocked right away.  ALSY PLL relocked after TJ restarted the laser.

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