gabriele.vajente@LIGO.ORG - posted 09:57, Thursday 27 April 2023 - last comment - 09:14, Monday 15 May 2023(69082)
Retuned ITMY angle to length
Retuned ITMY angle to length gains, looking at reducing the coupling of CHARD pitch and yaw lines at 8.125 Hz.
Old settings:
P2L = -0.05
Y2L = -1.7
New settings:
P2L = 0.04
Y2L = -0.17
Coupling from CHARD_P to DARM is reduced by 12 db
Coupling from CHRAD_Y to DARM is reduced by 35 db
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In case people are trying to mark changes to the IFO relative to this change, the updated A2L gains in this alog only held for the lock they were changed in. They were not put in the guardian for weeks after. This error was recently fixed, see alog 69557.