Reports 1-1 of 1 Clear search Modify search
Virgo Runs (O4c)
tomelleri - 8:19 Wednesday 16 July 2025 (67308) Print this report
Operator Report - Night shift

ITF found at CARM_NULL_1F in TROUBLESHOOTING mode waiting for Violin modes to subside. PSTAB loop still open.
Unlocks due to IMC unlock (UTC):

  1. 21:12 unlocked due to diverging SSFS corr. Automation reached CARM_NULL_1F again on first attempt at 21:25.
  2. 21:45 unlocked with too much power on B7 and B8.
  3. 21:58 unlocked at LOCKING_CARM_NULL_3F. Reached CARM_NULL_1F on first attempt at 22:11.
  4. 22:25 again due to diverging SSFS corr. INJ On-call (Spinicelli) notified.
  5. 02:52 at FMODERR_TUNED

Attempted to lock in LN3 at 02:20UTC: LN2 achieved at 02:30UTC, unlocked at 02:31UTC due to Diffp oscillation (pdf 1). Automation reached LOCKING_CARM_NULL_3F before unlocking twice in the same way at 02:41 and 02:51UTC with SDB2_B1p_QD1 horizontal and vertical loops open. Unlocked in LOCKED_CARM_MC_IR at 03:04UTC with B1p_QD1 horizontal loop open. Then systematically in LOCKING_CARM_MC_IR at 03:12, 03:20 and 03:28UTC with both horizontal and vertical loops open (DMS plots in fig.2 and 3.)
Unlocked in LOCKING_CARM_NULL_3F at 03:37UTC and then in LOCKING_CARM_MC_IR at 03:45UTC. DET On-call (Was) notified as I cannot find a way to close B1p Quadrants loops beyond lock of CITF. (DMS plot in fig.4)
03:55 - 04:50UTC Attempted step by step lock acquisition twice up to LOCKED_CARM_MC_IR to isolate the issue. ITF keeps unlocking systematically (04:25 and 4:45UTC) beyond that point, so I parked it in LOCKED_ARMS_BEAT_DRMI_3F waiting for expert intervention.
05:19UTC After cross alignment of SR with assistance from Berni and Was, lock acquisition towards CARM_NULL_1F finally progressed up to CARM_NULL_3F, before unlocking again at 05:25UTC. Relocking in progress.

Guard tour (UTC)
          -> 21:29
23:06 -> 23:50
01:15 -> 01:56
03:20 -> 03:56

Sub-system reports

DET
21:59-22:06UTC SDB2_B1p_QD1 and QD2 Vbias rearmed and Shutter opened during lock acquisition 3.
02:42-02:47UTC SDB2_B1p_QD2 Vbias rearmed and Shutter opened.
21:59-22:06UTC SDB2_B1p_QD1 and QD2 Vbias rearmed and Shutter opened.
04:39UTC SDB1 LC floating setpoints disabled by Was for Galvo quadrant intervention.

Images attached to this report
Non-image files attached to this report
Comments to this report:
mwas - 14:35 Wednesday 16 July 2025 (67310) Print this report

A note for the future. The B1p galvo loops opening systematically during the lock acquisition usually means that SR is strongly misaligned, which puch offsets into the SDB1 alignment, and as a result the beam is far from the middle of the B1p quadrants on SDB2, out of the actuation range of the galvo. The solution for that is to realign SR, normally no action is actually needed on the quadrants or the SDB1 alignment. This was the case in the past three occurrence that I can remember in the last 12 months.

Search Help
×

Warning

Error

The present report has been modified outside this window. Please check for its integrity in the main page.

Refreshing this page will move this report into drafts.

×