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Time-Domain Calibration Update

Time-Domain Calibration Update. Xavier Siemens, Mike Landry, Gaby Gonzalez, Brian O’Reilly, Martin Hewitson, Bruce Allen, Jolien Creighton. S4 Feedback loop. Residual signal. External signal. + -. a C o. AS_Q. b. DARM_ERR =. Control signal. D o. + +. A. DARM_CTRL_EXC = m.

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Time-Domain Calibration Update

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  1. Time-Domain Calibration Update Xavier Siemens, Mike Landry, Gaby Gonzalez,Brian O’Reilly, Martin Hewitson, Bruce Allen, Jolien Creighton

  2. S4 Feedback loop Residual signal External signal + - aCo AS_Q b DARM_ERR = Control signal Do + + A DARM_CTRL_EXC = m DARM_CTRL =

  3. + + S4 signal processing pipeline LP FIR LP FIR HP FIR - Reference functions digitised are for v1 calibration.- Factors (ab ) are computed at 1Hz.- All science data is available in the form of 256s frames (sometimes shorter at the end of a science segment).- Systematic errors at most ~1% in amplitude and ~1o in phase, between 30Hz and 3000Hz- The calibration lines, and anything else added to DARM_CTRL, approximately cancel. This includes ringing due to calibration line dropouts.

  4. Plans and Prospects - When final S4 calibration is out we’ll make the h(t) for it.- For S4, will change the pipeline to generate the control signal from DARM_ERR (not DARM_CTRL). This is due to some artefacts found in DARM_CTRL (see M. Landry’s talk coming up soon). Calibration accuracy at low frequencies (~30Hz) will most likely be degraded (a few percent in magnitude, a few degrees in phase). - For S5 will be running online under onasys (as during S4); hopefully the problem with DARM_CTRL will be fixed and we can use it to make h(t).

  5. Coming up: h(t) experimentation - Talks by: - Mike Landry for pulg - Stochastic group - Igor Yakushin for the burst group - Saikat Ray Majumder also for the burst groupMany thanks to them also to Laura Cadonati and Philip Charlton!

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