aidan.brooks@LIGO.ORG - posted 13:11, Wednesday 16 October 2019 - last comment - 07:53, Thursday 17 October 2019(52515)
ETMY RH stepped by 1W to 1.8W output power
GPS = 1255291770: stepped ETMY RH power from 1W to 1.8W (increase of 0.5W per segment).
1255293450 - Ring heater set back to 0.8W total.
1255293700 - RH set to 4.8W total
1255303800 - RH set to 0.8W again
Here are some measurements of the RH thermal lens. There is clearly a quadratic lens visible in the wavefront but there are regions of systematic spatial noise in the wavefront - particularly in the top left hand corner and in the center. We're going to attempt to clean these up by tweaking the alignment today.