camilla.compton@LIGO.ORG - posted 17:00, Wednesday 14 May 2025 - last comment - 09:46, Thursday 15 May 2025(84401)
Corner Station Ring Heater and SR3 Chassis back on. ITMX RH back to 0.44W/segment
Fil, TJ, Camilla. WP 12533
We turned back on the RH and SR3 heater chassis which were turned off for venting. After these were turned on, ITMX came back to it's nominal value of 0.44W/segment.
TJ and I played with the inverse RH filters for a while on ITMX (instructions 50777), turning ITMX up to 0.5W for a couple of hours, it doesn't really make sense to us what it was doing as it drops the power lower than the requested power which seems un-intuitive 68549. Now back at nominal 0.44W/segment with the RH inverse filter guardian back to NOMINAL (off).
ETMY had come back to the incorrect value after the April power outage (last saved Beckhoff value maybe), so TJ turned that back to the nominal 1.3W/segment on ETMY too.
The HWS signal from this RH turn does not look very clear plot, I removed a few dead pixels (wiki). The HWS spots on the ITMX camera are not very bright plot (even set to minimum frequency 1Hz), so TJ and I plan to replace the SLEDs.