edmond.merilh@LIGO.ORG - posted 20:33, Tuesday 15 September 2015 - last comment - 00:32, Wednesday 16 September 2015(21563)
Mid-Shift Summary - Evening
Mid-Shift Summary:
- IFO remains locked and Observing at ~70Mpc for ~ 2.75hrs. Earlier the Intent bit was turned off momentarily right after it was set and then turned back on because I noticed that one of the CAL lines wasn’t on. It was the EY PCal lines. The missing peak was a little hard to see due to the overlaying of plots. Seismic and wind activity remain quiet. MIcroseism has been steadily increasing over the last 22 hours. Occassional ETMY glitching (will be detailed in the end of shift activity log.
When the Beckhoff crate when down last night the Pcal laser shut down, likely due to not getting the enable signal from the Beckhoff chassis.
When it was swapped the second time, (original unit swapped back in?) the Optical Follower Servo was not locked. Opening, then closing the loop allowed the loop to relock.