STATE of H1: Observing at 154Mpc
CURRENT ENVIRONMENT:
SEI_ENV state: CALM
Wind: 8mph Gusts, 5mph 5min avg
Primary useism: 0.04 μm/s
Secondary useism: 0.94 μm/s
QUICK SUMMARY:
InLock Sus charge measurements likely caused the lockloss this morning. Though there was a PI message at the same time. but the PI didn't seem high enough to break a lock.
https://ldas-jobs.ligo-wa.caltech.edu/~lockloss/index.cgi?event=1387641172
Relocking started before 1600UTC.
16:45 UTC NOMINAL_LOW_NOISE reached and OBSERVING at 16:51 UTC
SQZ manager dropped us into commissioning at 17:22 UTC
Back to Observing at 17:24 UTC
N2 truck arrived at Y end around 17:34.
I missed the time that the N2 truck left. I believe it was shortly after 1900 UTC
The Temps in the in the VPW ranged from 66F to 73F. Im not sure what the correct range should be, but the one that read 73 was nearest the warmed server exhaust on that side of the room.
Attached is a plot of today's noisy events related to the LN2 delivery to the tank for CP7. Since the IFO was locked flagging the respective groups.
We lost lock during the SETUP step of ESD_EXC_ETMX, plot attached. ETMX_L3_DRIVEALIGN_L2L (bottom right) had an output but I don't think it should have as the feedback is on ITMX at this point and the excitation hadn't started yet. Should check this before next Tuesday.
ESD_EXC_ETMX log before lockloss:
2023-12-26_15:52:32.263999Z ESD_EXC_ETMX [SETUP.main] ezca: H1:SUS-ETMX_L3_DRIVEALIGN_L2L_TRAMP => 1
2023-12-26_15:52:32.264996Z ESD_EXC_ETMX [SETUP.main] ezca: H1:SUS-ETMX_L3_DRIVEALIGN_L2L_GAIN => 1
2023-12-26_15:52:33.394157Z ESD_EXC_ETMX [SETUP.main] ezca: H1:SUS-ETMX_L3_DRIVEALIGN_L2L_SW1S => 0
2023-12-26_15:52:33.645345Z ESD_EXC_ETMX [SETUP.main] ezca: H1:SUS-ETMX_L3_DRIVEALIGN_L2L => ONLY ON: OUTPUT, DECIMATION
Looking at a successful ETMX SETUP state, you can see that there is still a small time where ETMX_L3_DRIVEALIGN_L2L has an output, the IFO just survives the glitch. This happens when the gain is changed from 0 to 1 (to allow excitation through) but before the INPUT is turned off. I've swapped the order of these two lines and added a 1sec sleep between them to make sure that the input is turned off before the gain is ramped to 1. Edit has been saved and will reload during next commisioning period.