Ivey, Edgard.

Ivey made even newer fits for the M1 SR3 in "Yaw using the measurements that Oli took in [LHO: 86075].

These fits are pretty similar to the last set we got in [LHO: 85446]. However, this time, Ivey used vectfit3 for both of the fits directly. She only manually ensured that the zeros were all in the left-hand-plane, and that there were no additional zeros in the M1 to M1 transfer function, even if the measurements show a bit extra phase loss compared to the fit.

These are the fits obtained [see figures for an eye-test of the goodness of fit]:

For the ISI to M1 transfer function:
'zpk([0,0,-0.027+20.489i,-0.064+11.458i,-0.027-20.489i,-0.064-11.458i],[-0.072+6.395i,-0.072-6.395i,-0.096+14.454i,-0.096-14.454i,-0.062+21.267i,-0.062-21.267i],-0.001)'

The M1 to M1 transfer function:
'zpk([-0.002+19.246i,-0.005+8.312i,-0.002-19.246i,-0.005-8.312i],[-0.065+6.392i,-0.065-6.392i,-0.076+14.442i,-0.076-14.442i,-0.055+21.272i,-0.055-21.272i],12.085)'

The fits were added to the Sus SVN and live inside '/ligo/svncommon/SusSVN/sus/trunk/HLTS/Common/FilterDesign/Estimator/fits_H1SR3_2025-07-29.mat' .

The filters can be installed using 'make_SR3_yaw_model.m', which lives in the same folder [for reference, see LHO: 84041, where Oli got the fits running for a test]. This last script, as well as 'make_SR3_yaw_blend.m' were updated to work with the new naming convention for the estimator block.

Hopefully we will get to test the estimator again soon!