Matlab TFs were retaken on the ETMX (QUAD) suspension overnight, after DTT TFs taken earlier on the afternoon had shown no signs of rubbing, but had some ratty zeros (see LHO aLOG entry 13126), as follows:-

- ETMX M0-M0 undamped (2014-08-01_1090893895_H1SUSETMX_M0_damp_OFF_ALL_TFs.pdf)
- ETMX R0-R0 undamped (2014-08-01_1090911928_H1SUSETMX_R0_damp_OFF_ALL_TFs.pdf)

BSC9 ISI Status: ISI damped and ST1 high isolation.

ETMX alignment: No offset was applied during this measurement.

The above Matlab measurements have been compared with the latest DTT TFs (allquads_2014-07-31_H1SUSETMX_Phase3a_Doff_ALL_ZOOMED_TFs.pdf), the plot key is:-

Blue Trace = Model Prediction.
Orange Trace = H1 ETMX (erm 2014−07−31), Phase 3a (in-air).
Black Trace = H1 ETMX (erm 2014−08−01), Phase 3a (in-air).

Summary:

The overnight Matlab TFs are much improved, showing higher Q's, and better defined zeroes, most importantly they raise no concerns for the top stage of ETMX following chamber close-out.

All data, scripts and plots have been committed to the sus svn as of this entry.