daniel.brown@LIGO.ORG - posted 15:36, Tuesday 28 March 2023 - last comment - 20:41, Tuesday 28 March 2023(68215)
ETMX RH change
I have changed the ETMX ring heater to H1:TCS-ETMX_RH_SETUPPERPOWER => 0.5W and H1:TCS-ETMX_RH_SETLOWERPOWER => 0.5W, both from 0.4W. This is to try and gently ring up the 14.7 kHz PI (68165) and see if we can damp it. Can also check if this is a good direction to go in in terms of optical gain and noise couplings.
This lock we finally saw one of 14.7kHz PI gently ring up. It appeared briefly around 25 minutes into this lock, but has since reduced.