oli.patane@LIGO.ORG - posted 09:19, Monday 07 April 2025 - last comment - 14:16, Monday 07 April 2025(83769)
Status of power outage recovery
Came in to find all IFO systems down. Working through recovery now.
SUSB123 power supply seemed to have tripped off. ITMs and BS OSEM counts were all sitting very low around 3000. Once power supply was flipped back on, OSEM counts returned to normal for ITMX and BS, but now ITMY coil drivers filter banks are fflashing ROCKER SWITCH DEATH. Jeff and Richard are back in the CER cycling the coil drivers to hopefully fix that.
Also power for ISIITMY is down and being worked on to bring back.
Most of vent work is currently on hold and focused on getting systems back online
Cycling the coil drivers worked to fix that issue with the ITMY coil drivers. They needed to turn the power back off, turn the connected chassis off, then turn the power back on and then each chassis back on one by one.
The ITMY ISI GS13 that failed was replaced,and work is still going on to bring ITMY ISI back.
There are some timing errors that need to be corrected and a problem with DEV4 at EX.
Once the ISI was back, Elenna and I brought all optics in HAM7/8 back to ALIGNED. Elenna put ZM4, FC1 back to before the power outage as they had changed ~200urad from SQZ/FC ASC signals being zeroed. Everything else (ZM1,2,3,5,OPO,FC2) was a <5-10 urad change so leaving as is.