21:18- UTC - Calibration Measurement (simuLines) started.
21:19 - UTC - Lost Lock
Potentially (but unlikely) related - Oli also lost lock during Simulines during their shift - alog 74716
Relocking Now as of 21:20 UTC.
Attached shows that the sus excitations began shortly before the oscillation begain, but that the DARM1 and SWEPTSINE excitations began after the oscillation. Investigation still ongoing as to what caused the lockloss though.
We plotted the fast 16kHz channel of H1:SUS-ETMX_L2_CAL_EXC_OUT_DQ and can see this excitation caused the ETMX oscillation and lockloss. Sheila/Jenne state this is not that surprising as the gains have been changed the ETMX filters. Plot attached.