[Keita Jeff Arnaud]

Several measurements were taken on ETMX for top mass length to test mass pitch decoupling as well as for the pum tf inversion (cf Keita's aLog), and are summarized in the attached plot.

Page 1 and 2 : Top mass to test mass TF compared with the "fiber" model, length to pitch (p1), pitch to pitch (p2)
Page 3 and 4 : Pum to test mass TF compared with the "fiber" model, pitch to pitch (p3), yaw to yaw (p4)

Points with an uncertainty lower than 10% have been removed from the transfer functions.The data for the length to pitch (2nd page) is a combination of a swept sine measurement, and a white noise measurement.

Measurements slightly differs from the model, especially for the top mass pitch to test mass pitch (p2), thas has its first pitch mode shifted down. It would be interesting to plot those measurements against the correction that is beeing made to the current model.

The data for the pum pitch to test mass pitch doesn't have any coherence below 0.6Hz, and those points have been deleted because of a low uncertainty, so it is currently hard to do a fit with the few points we have. I would like to try few more times tomorrow to do this TF again.

In the meanwhile, I will use Keita's happyVecfit function to do the top mass fitting, and calculate -L2P/P2P