KAGRA Logbook

Reports 1-1 of 1

CRY (Cryo-payload EX)

shinji.miyoki - 6:38 Tuesday 15 July 2025 (34556)

OPLEV value changes check at EX

I checked the OPLEV sum for TM and MN for the last~ one month.

TM OPLEV seems to have ~ day-level oscillation, with a half-day level small oscillation. Is it related with tidal motion? The total value seems to decrease gradually.

MN OPLEV seems to have ~ week level oscillation.

Images attached to this report

34556_1752498512_Screenshot from 2025-07-14 22-03-05.png

Comments to this report:

tomotada.akutsu - 9:04 Tuesday 15 July 2025 (34560)

There have been many mysteries of this kind for oplev sums since iKAGRA. One option to resolve this phenomenon would be to set a direct power monitor just after the collimator of the oplev light source.