[Arnaud P, Betsy W, Jeff K, Norna R, Stuart A,]

Matlab TFs were taken last night for the top stages on both main and reaction chains of the ITMY (QUAD) suspension, as follows:-

- ITMY M0-M0 undamped (2014-07-28_1090624828_H1SUSITMY_M0_damp_OFF_ALL_TFs.pdf) 
- ITMY R0-R0 undamped (2014-07-28_1090642628_H1SUSITMY_R0_damp_OFF_ALL_TFs.pdf)

BSC1 ISI Status: ISI locked.

ITMY alignment: No offset was applied during this measurement.

The undamped TFs from above have been compared with the most recent set of 'good' measurements taken after IAS alignment and before being fully pay-loaded (allquads_2014-07-29_H1SUSITMY_Phase3a_Doff_ALL_ZOOMED_TFs.pdf).

Summary: 

It can be seen that a R mode at ~2.6 Hz cross-couples into both L and most significantly V DOFs. Furthermore, this occurs for both main and reaction chains, so investigating the UIM stage for signs of rubbing would be first port of call.

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