sheila.dwyer@LIGO.ORG - posted 06:28, Tuesday 25 February 2020 - last comment - 11:15, Tuesday 25 February 2020(55281)
squeezer cycled
Looks like we had a repeat of the squeezer 15kHz oscillation problem. It sounds like neither TJ nor I got an alert. I requested no_squeezing and then after it arrived requested squeezing again. We are back in observe.
Comments related to this report
thomas.shaffer@LIGO.ORG - 06:38, Tuesday 25 February 2020 (55282)CDS
IFO_NOTIFY correctly saw the issue and moved to the ALERT_ACTIVE state at 13:03 UTC, but I didn't receive anything until it went back to WAITING at 14:23 UTC when Sheila fixed it.
2020-02-25_13:03:03.143111Z IFO_NOTIFY [ALERT_ACTIVE.enter]
2020-02-25_13:03:03.218729Z IFO_NOTIFY [ALERT_ACTIVE.run] SQZ OPO REFL DC Power has increased. Sending
2020-02-25_14:23:27.577427Z IFO_NOTIFY JUMP target: WAITING
2020-02-25_14:23:27.578100Z IFO_NOTIFY [ALERT_ACTIVE.exit]
Out of Observing from 1422-1423 UTC
sheila.dwyer@LIGO.ORG - 09:01, Tuesday 25 February 2020 (55284)
The system is currently designed not to send Guardian alerts if the IFO is both locked and in observe. This morning when H1 was briefly taken out of observe to reset the squeezer the pending alert was issued.
Design details: if the IFO is not locked+observe and IFO_NOTIFY state transistions to state 30, then GRD alerts are immediately sent out and the system is latched to prevent repeat alerts. The latch is cleared when the IFO goes into locked+observe.
If it is determined that Guardian alerts should be sent irrigardless of the IFO state (e.g. squeezer causing range degradation), I can change the code to do this. We will need to ensure that IFO_NOTIFY does not oscillate between its states too quickly otherwise many alerts could be sent.
IFO_NOTIFY correctly saw the issue and moved to the ALERT_ACTIVE state at 13:03 UTC, but I didn't receive anything until it went back to WAITING at 14:23 UTC when Sheila fixed it.
2020-02-25_13:03:03.143111Z IFO_NOTIFY [ALERT_ACTIVE.enter]
2020-02-25_13:03:03.218729Z IFO_NOTIFY [ALERT_ACTIVE.run] SQZ OPO REFL DC Power has increased. Sending
2020-02-25_14:23:27.577427Z IFO_NOTIFY JUMP target: WAITING
2020-02-25_14:23:27.578100Z IFO_NOTIFY [ALERT_ACTIVE.exit]
Out of Observing from 1422-1423 UTC
The reason that I didn't get a notification might be that I didn't have guardian notify set to yes. Screenshots attached.
The system is currently designed not to send Guardian alerts if the IFO is both locked and in observe. This morning when H1 was briefly taken out of observe to reset the squeezer the pending alert was issued.
Design details: if the IFO is not locked+observe and IFO_NOTIFY state transistions to state 30, then GRD alerts are immediately sent out and the system is latched to prevent repeat alerts. The latch is cleared when the IFO goes into locked+observe.
If it is determined that Guardian alerts should be sent irrigardless of the IFO state (e.g. squeezer causing range degradation), I can change the code to do this. We will need to ensure that IFO_NOTIFY does not oscillate between its states too quickly otherwise many alerts could be sent.