sheila.dwyer@LIGO.ORG - posted 11:54, Tuesday 14 January 2020 - last comment - 11:01, Tuesday 21 January 2020(54499)
ITMX noise mon transfer functions
Attached is a dtt file with measured transfer functions from master outs to the newly installed noise monitors for ITMX. I started but didn't finish making the same set of measurements for ITMY.
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Today I copied the AntiLPL2 filters from the coilout filters to the noise mon filters, and engaged them. When we are locked the pum coil drivers are in state 3, Acq filter on, low pass filter off. According to T1100378-v12 the noise monitor is after the low pass filter, but before the acquisition filter. In low noise the coil drivers are in state 3, LP on Acq off, so I set them into that state and measured the transfer functions from master out to noise monitor for each coil on both ITMX and ITMY.
Attached are the new measurements.
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