eleanor.king@LIGO.ORG - posted 14:30, Tuesday 01 March 2016 - last comment - 16:38, Tuesday 01 March 2016(25806)
ITMX HWS SLED replaced, SLED power calibrated
Cao, Nutsinee, Elli
We replaced the ITMX HWS SLED with a spare.
We remeasured power coming out of the SLEDs using an Ophir power meterhelp directly in front of the fiber.
The ITMX SLED power was 1.35mW (running at 98mA current)
The ITMY SLED power was 2.90mW (running at 103mA current.)
The SLED power channel H1:TCS-ITMX/Y_HWS_SLEDPOWERMON was recalibrated using new gains and dark offsets
H1:TCS-ITMY_HWS_SLEDPOWERMON=0.48*intput-0.0071
H1:TCS-ITMX_HWS_SLEDPOWERMON=1.089*input-0.154
We tested ITMX's HWS by applying a high heat on CP by the CO2 laser. It seems that it is properly functioning. Also the simulator does not seem to be terribly off in the prediction. Once we know the interferomter heating, we can start testing the pre-loading on the X arm.