ryan.crouch@LIGO.ORG - posted 18:28, Monday 30 October 2023 - last comment - 13:08, Tuesday 31 October 2023(73854)
COMM and DIFF beatnote trend over 04
The DIFF beatnote looks to be pretty stable over the past 5 months, the COMM beatnote has fluctuated more, and looks to be decaying over the past 10-20 days.
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Attached is the COMM beatnote decaying with PR3, showing PR3 has moved ~1urad in PIT and YAW over the last week. Temperature has been oscillating more for the last week too. We have seen PR3 previously change with temperature 70008. HAM2 ISI is not moving.
Looking at locking yesterday, COMM beatnote was~ -19 before Initial alignment (t-cursor) and -16 afterwards. Sheila says that we usually have issues once it gets close to -20. Beatnotes last aligned in May 69907.
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