Overview
We will test silent calibration lines over several days to see if we can extract temporal variation in UIM, PUM and TST actuation strengths with the help of cancelled calibration lines. Currently we set up three cancelled calibration lines, one for each of the actuation stages. This will help us to test possibility of using silent lines for tacking calibration of the actuation stages.
Details
Earlier we tried to inject a line from TST actuation and cancel it using PcalY (see LHO alog 31526), but the line still appeared in the ΔLext. Today we adjusted amplitude and phase both in SUSETMY and PCALY. We also put lines into PUM and UIM stages and cancelled them with PCALY.
The oscillator settings have been accepted in SDF_OVERVIEW.
The settings for the cancelled lines are:
Oscillator Freq (Hz) SUS stage Amp (ct) PcalY Amp (ct)
ETMY UIM 15.7 270.0 4532.6
ETMY PUM 22.3 200.0 1000.6
ETMY TST 30.1 0.458 451.09After the work on adjusting these lines was done Travis started taking PCALY2DARM and DARM OL TFs for which all of the calibration lines were turned off, including the cancelled ones.
