jeffrey.bartlett@LIGO.ORG - posted 07:43, Wednesday 05 February 2020 - last comment - 09:05, Thursday 06 February 2020(54917)
Drop Out of Observing for CALINJ
At 15:18 (07:18) dropped out of Observing when CALINJ turned on, creating an SDF DIFF. Called LLO, no one there started them. Called LHO support and left message. At 15:25 (07:25) the injection stopped. The SDF DIFF cleared and went back to Observing.
This is the last of DetChar injections scheduled a few weeks ago (see alog 54500). These aren't suppose to knock the IFO out of observing. I suspect that the H1:CAL-INJ_TRANSIENT_GAIN channel has been somehow added to the channels that are being monitored. Can someone there ensure that this channel isn't being monitored.
This channel is currently not being monitored, but the rest of that filter bank is. I also don't see anything in the INJ_TRANS guardian node for that time (Feb 5 15:18UTC, log attached). This node also shows a DETCHAR injection at 9:59 UTC, and we did not get kicked out of Observing then. Looking at the gain for those times, we see it change for only the 9:59 time.
If this wasn't seen by INJ_TRANS, what else could be changing something in CALINJ?
Ah. It isn't something turning on, it's something turning off. The CW injections stopped at that time and then restarted themselves, as they should. There was also a DIAG_MAIN message stating exactly this.