camilla.compton@LIGO.ORG - posted 10:11, Sunday 16 July 2023 - last comment - 12:50, Sunday 16 July 2023(71377)
Lockloss @ 17:06UTC
1373562320 After 2h30 in NLN. No obvious cause.
1373562320 After 2h30 in NLN. No obvious cause.
Dave notes that this lockloss occurred towards the end of CP1 fill 71376 and sometimes there is a bang noise with the fill as the pipes change pressure.
I see nothing in the PEM channels that would cause a lockloss. Attached is some nearby microphone and accelerometer plots. You can see H1:PEM-CS_ACC_BEAMTUBE_YMAN_X_MON get noisier during this time. Looks like there used to be a H1:PEM-CS_MIC_YMAN_SPOOL_MON that isn't there anymore? Tagging PEM
Back to NLN and Observing at 19:48UTC after waiting 1h40m(!!!) in OMC_WHITENING for violins to damp, Mainly ETMX 4 and 7 that are taking a long time to damp, tagging SUS.