After securing doors on HAM4, TFs taken indicated an issue with the actuation for the SR2 M1 LF BOSEM channel (see LHO aLOG entry 12923). Upon investigation this was found to be due to a loose connector on the air side of the chamber flange (see LHO aLOG entry 12942) and must have developed during chamber close-out activities.

Phase 3a TF measurements have been retaken for all stages of the SR2 suspension as follows:-  

- SR2 M1-M1 undamped (2014-07-23_1300_H1SUSSR2_M1_ALL_TFs.pdf)
- SR2 M2-M2 undamped (2014-07-23_1500_H1SUSSR2_M2_ALL_TFs.pdf)
- SR2 M3-M3 undamped (2014-07-23_1600_H1SUSSR2_M3_ALL_TFs.pdf)

HAM4 ISI Status: ISI unlocked, no damping or isolation loops running.

SR2 alignment: No offset was applied during this measurement.

SR2 undamped measurements for each stage have been compared with other H1 HSTS suspensions at Phase 3a of testing (allhstss_2014-07-23_Phase3a_H1SR2_*_ALL_ZOOMED_TFs.pdf).

Summary: 

M1-M1 TFs verify that the actuation problem has been solved, with L & Y DOFs now exhibiting expected performance, and raise no new concerns.
 
M2-M2 TFs, show good agreement with the model and are consistent with other H1 HSTS suspensions.

M3-M3 TFs, while noisy, again, thees show good agreement with the model and are consistent with other H1 HSTS suspensions.

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