Virgo Logbook

The firs part of this shift was dedicated to work on detection: Matteo and Romain from remote worked with the itf not locked up to 17:15utc; then we tried to relock the itf but we had some problem: the itf unlocked every time once reaching the dark fringe, I contacted Maddalena (ISC on-call) that suggest to change the DARM gain so I tried to increase it and finally at 19:15utc we succeeded to relock in LOW_NOISE_3 state and I started the standard calibration measurements:

- 19:16utc - 19:37utc, marionette calibration (CALIBRATED_DF_MIRtoMAR)
- 19:38utc - 19:48utc sensitivity and validation of h(t) reconstruction (CALIBRATED_DF_SENSITIVITY)
- 19:51utc - 20:00utc Photon calibration injections (CALIBRATED_DF_PCAL)
- 20:02utc - 20:29utc free swinging Michelson (CALIBRATED_FREEMICH_WINI)
- 20:30utc - 20:32utc Time delay measurements: between CAL and Sc noise channels (CALIBRATED_DELAY)
- 20:33utc - PR-WI cavity (CALIBRATED_PRWI) --> failed because of not possible to lock the PR-WI cavity
- 20:35utc - 22:54utc Measurements for NE,WE mirrors calibration (CALIBRATED_DF_INtoEND_LN2)

at the and I tried relock but I had difficulties even in locking the single cavities so I left the itf in LOCKED_SSFS state.

-daq
susp_Fb stopped/restarted at 18h03utc because of missing suspension data at FbmFE level.

-det
after the failing of the PR-WI calibration the beam was completely out of the detection photodides (beam completely out on B1p camera), I tried to open and reclose the bench local control but without any changes, to recover the situation I changed the SDB1 TX set point from -415 to -235 (see plot)