Attached is a plot showing systematic errors of the actuator kappas (kappa_T, kappa_P, kappa_U) caused by approximations we use to estimate them.  These errors are induced by changes in the ratio of the time-dependent response function R(f_pcal1) / R(f_act_i), where f_pcal1 = 17.1 Hz is the frequency of the Pcal line that is close to the actuator lines, and f_act_i are the actuator lines (f_TST = 17.6 Hz, f_PUM = 16.4 Hz, f_UIM = 15.6 Hz).  The ratio R(f_pcal1) / R(f_act_i) is approximated as constant in the calculation of the actuator kappas.  The plot shows errors in the real and imaginary parts of kappa_TST, kappa_PUM, and kappa_UIM, as a function of kappa_TST and kappa_C, which have the most significant on them impact by far.  The model used to produce this data is described in LHO aLOG 54269.

The plot can be found in the calibration SVN  (revision 9423) here:

• aligocalibration/trunk/Runs/O3/H1/Scripts/TDfilters/H1_20200103_TDCF_errors/TDCF_errors.png

Plotting scripts for this can be found in the calibration SVN here:

• aligocalibration/trunk/Runs/O3/H1/Scripts/TDfilters/H1_compute_TDCF_errors.sh
• aligocalibration/trunk/Common/pyDARM/compute_TDCF_errors.py