georgia.mansell@LIGO.ORG - posted 17:30, Thursday 26 July 2018 - last comment - 16:51, Friday 27 July 2018(43097)
Delayed-start script running to turn on ITM ring heaters tonight
Danny has a script running on ZOTWS9 that will run the ITM ring heaters with 3W of power for 30 minutes starting at 07:00 UTC.
Script is found at userapps/tcs/common/scripts/ring_heater_schedule_TJ.py
Note: the duration argument is in hours!
TJ, Georgia
The results of last night's ring heater test are attached. The figures show comparisons between a cold ITM and an ITM after 30 mins of 3W ring heater exposure.
ITMY HWS beam looks misaligned in pitch, we can actuate on the top periscope mirror picomotors and try to take this image again to compare.
ITMX is problematic... There is a clearly defined ring present in the left plot which we initially thought to be the ALS green light leaking onto the HWS, but it is there even during times when the ALS is shuttered. Perhaps there is some clipping of the HWS beam on the table. We tried to check the camera image (HWS with no array plate attached) again, note in alog 43078 there was a second brighter spot that we thought maybe we could remove with an iris. However we had problems streaming, we rebooted h1hwsmsr1, but then had problems with the run_HWS.py script and now the camera is "not accessible"... TBC.