KAGRA Logbook

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VIS (General)

takaaki.yokozawa - 9:02 Friday 27 February 2026 (36455)

ITMY and ETMY cannot be SAFE state by guardian

Since the one NBDAMP filter gain became non-zero value, both ITMY and ETMY guardian cannot be SAFE state.
If this changes were permanent state, please modify the guardian.
If this changes were not permanent sate, please back to nominal state after you use.

Images attached to this report

36455_1772150529_Screenshot from 2026-02-27 08-58-30.png

36455_1772150532_Screenshot from 2026-02-27 08-59-02.png

Comments to this report:

kenta.tanaka - 16:15 Friday 27 February 2026 (36461)

Sorry, they were used for High-Bandwidth ASCs. I forgot to turned off them.

For now, we do not plan to use High-Bandwidth ASCs until the RSE commissioning. I'm not sure whether they are used in nominal PRFPMI lock. However PRFPMI could be locked either with or without them. So They can be turned off for now.