[Mark Arnaud]

Results of ETMX M0 and R0 phase 3a (in chamber, in air) transfer functions from yesterday night have been processed and are plotted in the attached documents.

(1) Comparison between undamped M0 TF and model

(2) Comparison between undamped R0 TF and model

(3) Comparison between undamped M0 TF LHO phase 3a (in chamber), phase 2c, and LLO phase 2c

Main chain of ETMX is matching well the model cf (1), meaning it was freely suspended during the alignment (cf 8126). Only two modes of pitch are shifted down, which is a feature we already saw previously (cf (2) and alog 7415)

R0 measurements are not matching the model as well as M0, meaning something might be rubbing. Transverse and yaw degrees of freedom are very noisy. It makes sense for yaw, since the watchdog tripped when it was beeing driven, although it is not clear yet for transverse cf (2). It could be an issue in the actuation chain and I will take a closer look tomorrow.