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On-call intervention (General)
Oncall-system - 11:48 Saturday 01 February 2025 (66112) Print this report
On-call intervention

The following report has been submitted to the On-call interface.

On-call events -> Interferometer Sensing & Control

Title: Problem with green locking at WE

Author(s): spinicelli

Called at: 10:00, 01-02-2025, by: Berni
Remote intervention: Started: 10:00, 01-02-2025; Ended: 11:00, 01-02-2025
On-site intervention: Started: ; Ended:
Status: Resolved
Operator when issue resolved: Berni

Details:

After un unlock of the ITF (07:59:38, reason unclear, it seems a glitch on INJ_EOM)  the green at WE couldn't relock properly. Because of a misaligned BPC there was almost no green power on reflection; unfortunately, this has been recognized by the automation as arm locked since the locking trigger ( WEB_PD_REFL ) had the similar level as the one locked (fig. 1). The lock acquisition continued towards the beating step, failing at each time.

Indeed, after the unlock, SWEB controls opened, and even if the BPC at WE was engaged, it didn't recover the correct position (see fig. 2).
Opening and closing the BPC via VPM solved the problem.

The ITF is now relocking.

* Note that any files attached to this report are available in the On-call interface.

Comments to this report:
spinicelli - 11:49 Saturday 01 February 2025 (66113) Print this report

the attached figures.

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