patrick.thomas@LIGO.ORG - posted 00:13, Friday 12 August 2016 - last comment - 10:54, Friday 12 August 2016(29046)
Ops Evening Summary
Stefan and Sheila working on shutter control logic. I helped resolve problems with h1ecatc1. Had to restart EPICS IOC and copy updated PLC2 to target. 23:32 UTC Gerardo to HAM6 area to check on vacuum equipment 23:39 UTC Gerardo back 03:05 UTC Joe to Y2-5 to watch meteor shower with telescope 04:30 UTC Stefan and Sheila done working on shutter control logic. Kiwamu starting work. 06:17 UTC Kiwamu to end X to investigate green laser electronics 07:00 UTC Kiwamu back I was able to get the Y arm green power to around 1 with LOCKED_NO_SLOW_NO_WFS, but if I put it on INITIAL_ALIGNMENT it would start to be driven away. Kiwamu was investigating the X arm.
Patrick, Kiwamu,
We are unable to engage the QPD servo for the X green injection beam. It seems to be an issue with the PZTs. We are leaving this issue until tomorrow.
Also, the readback of the POPX whitening settings don't match to the requested. This also needs to be fixed.
For the QPD loop issue -- after a through investigation today, it tuend out that it was not the PZTs but it was the QPD signals that were not functioninng. I drove to EX again today and found that the whitening chassis for this particular signal was physically switched off. So I switched it on by latching the switch to the on position on the back side of the chasis. The QPD servo now runs. Also, during the investigation I confirmed that the pzt mirros were functioning by sending some sinusoidal excitation and looking at the beam spots on the table.