Displaying report 1-1 of 1.
Reports until 21:59, Sunday 16 December 2018
H1 IOO (IOO)
cheryl.vorvick@LIGO.ORG - posted 21:59, Sunday 16 December 2018 (45999)
ISS second loop DC PDs decrease in power, QPD yaw at 0.88

Recovery from the PZT mount swap last week has pushed the ISS Second Loop to 0.88 in Yaw, and lowered the power sum of the ISS Second Loop's 8 PDs. It seems likely this is contributing to ISS issues, so recommended to recenter QPD and maximized power on the DC PDs.

The PZT swap moved the beam in yaw on the ISS Second loop QPD from -0.12 to I'm not sure, it looks like the QPd was centered, and then from that position to 0.88 when IM3 and 4 were used for recovering IM4 Trans and POP QPDs.

Plots attached show the PD inner sum decrease, QPD yaw alignment, IM3 alignment, and the input power, which shows that fpr requested power of 20W, the measured power went from 19.6W to just shy of 20W (19.98).

Images attached to this report
Displaying report 1-1 of 1.