gerardo.moreno@LIGO.ORG - posted 01:29, Wednesday 18 October 2023 - last comment - 10:26, Friday 20 October 2023(73545)
GV8 Annulus Ion Pump Failure
Today at 4:45 UTC the annulus ion pump for GV8 went down to zero-ish, not a common failure, perhaps the ion pump controller failed, we (vacuum group) will take a look at the system as soon as permissible.
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Late entry.
On Wednesday I had the opportunity to investigate the failure of the annulus ion pump, IFO was out of lock. The controller for the annulus ion pump did not show signs of power, the front display lights were off, see photo. Replaced the controller, and the system started working again. However, the signal for the current was a bit unusual, on a plot of the past 10 years the signal never reached such a low level, see attached plots.
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And today the AIP railed high. Pump to be changed next Tuesday.
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