jeffrey.kissel@LIGO.ORG - posted 03:50, Tuesday 02 June 2015 - last comment - 12:03, Tuesday 02 June 2015(18771)
H1 CAL-CS Front-End Calibration Has Been Updated!
J. Kissel, E. Hall See Evan's entry here: LHO aLOG 18770. We still need to double check it, and I'm sure we've made a mistake or two, but we think we've installed as much as we can based on the results of the DARM Open Loop Gain transfer functions we have compared against a model (see LHO aLOG 18769) and of the actuation coefficient measurements (see LHO aLOG 18767) For lack of better quantitative understanding of the DARM OLGTFs we have, we should still consider this calibration at an accuracy of 50% and 20 [deg]. (At least it's better than the factor of two promised :-/ ). Note that we have NOT yet updated the inverse actuation function in the hardware injection path. Sorry -- but that'll have to wait until the morning. We've still got plenty more to do and understand, but thanks to all who have helped over the past 1.5 weeks. You help has been invaluable, and much appreciated!! P.S. IF NEED BE -- one can revert to the old CAL-CS calibration by switching back to ETMX, then reverting to the former sensing function via the filter archive.
I found a bug -- ETMY ESD needs another factor of 4. I increased the gain of the simulated ESD filter by a factor of 4 in the CAL-CS front end model. See the attached screen shot. The SDF was consequently updated.
Also, along the course of trying to find a bug, I made a script which compares the filters in the CALCS font end modle and the ones in the matlab H1DARM model. It is is the calibration svn:
aligocalibration/trunk/Runs/PreER7/H1/Scripts/DARMOLGTFs/compare_CALCS_and_DARMmodel.mNOTE: This does not affect the gds calibration or h(t). This is only for CAL_DELTAL_EXTERNAL.