Virgo Logbook

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AdV-DET (Commissioning)

masserot - 22:18 Sunday 30 August 2026 (69669)

SDB2 bench : SDB2_DBOX_LeftUp found down

As already experimented 2 times during the week from 17-22 August, the SDB2_DBOX_LeftUp DBox was found unreachable in the Tolm network since 2026-08-30-14h22m05

Its have been recovered by performing

an OFF/ON using the SDB2_POWERSUPPLY server
and a full reconfiguration of the SDB2 bench DBoxes
Operations performed betxeeen 2026-08-30-18h32m45-UTC and 2026-08-30-18h57m14-UTC

The problem is not understood. For the time being

all the SDB2 suspension controls have been left open
the ITF_LOCK Metatron node put in DOWN

The attached plot shows the trend of the DBOXes' timing error channels and their 12V power supply channels before the event, during the event, and after the DBoxes reconfiguration

Images attached to this report

69669_1788121025_SDB2_DBOX_LeftUp-DBOX_SN106-issue_20260830-14h22m_UTC.png

Comments to this report:

mwas - 22:00 Sunday 30 August 2026 (69670)

DET_MAIN was stuck in UNKNOWN state because of a large offset on B1 PD3. After adjusting the offset around 19:45 UTC, I could put back DET_MAIN into the SHUTTER_CLOSED state. And then lock the arms using ITF_LOCK. SDB2 is not used for locked arms, so it should be ok to keep the arms locked even if SDB2 is not controlled.