Reports until 19:13, Thursday 31 October 2019
H1 CAL (CAL)
richard.savage@LIGO.ORG - posted 19:13, Thursday 31 October 2019 - last comment - 19:15, Thursday 31 October 2019(52853)
Updating Pcal force coefficients for temporary compensation for Pcal suspension filters still using O2 masses

DriptaB and RickS

Because we want to start O3 with updated Pcal force and displacement coefficients, and because the Pcal suspension filters have not yet been updated to incorporate the O3 masses (they are still using the O2 masses) we have generated "fudged" Pcal force coefficients to compensate for the incorrect ETM masses.

As soon as these filters are updated with the correct masses, we will revert to the "unfudged" coefficients.

The compensating force coefficients have been implemented as follows:

H1:CAL-PCALX_FORCE_COEFF_CTS2V_T 7.9264e-13
H1:CAL-PCALX_FORCE_COEFF_CTS2V_R 6.2333e-13
H1:CAL-PCALY_FORCE_COEFF_CTS2V_T 9.2340e-13
H1:CAL-PCALY_FORCE_COEFF_CTS2V_R 6.2795e-13

A table showing both the nominal and the compensating coefficient values, as well as the "fudge factors" from the O2/O3 mass ratio, is attached to the comment below.

Comments related to this report
richard.savage@LIGO.ORG - 19:15, Thursday 31 October 2019 (52854)CAL

Table of nominal and "compensating" Pcal force coefficients attached.

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