TFs taken on the TMSX (TMTS) suspension over the previous evening indicated an issue with spitting of the 2nd T DOF peak (see LHO aLOG entry 13066).

BOSEMs were re-centered by Gary (et al) and Keita inspected the suspension, subsequently giving it the all clear (see LHO aLOG entry 13088). Another round of TFs have been taken this afternoon for TMTSs at both ends, for comparison, as follows (noting that TMSY is in-vacuum):-

- TMSX M1-M1 undamped (2014-07-30_1400_H1SUSTMSY_M1_ALL_TFs.pdf)
- TMSY M1-M1 undamped (2014-07-30_1400_H1SUSTMSX_M1_ALL_TFs.pdf)

BSC9 ISI Status: ISI damped.
BSC10 ISI Status: ISI damped.

TMSX alignment: No offset was applied during this measurement.
TMSY alignment: P = -129 urad and Y = +1 urad during this measurement.

The above measurements have been compared with other H1 TMTS suspensions, also at Phases 3 of testing (alltmtss_2014-07-30_Phase3a_H1TMSX_M1_Doff_ALL_ZOOMED_TFs.pdf), the plot key is:-

Blue Trace = Model Prediction (tmtsopt_production).
Orange Trace = H1 TMSY M1 (2014−07−30_1400), Phase 3b (in-vacuum). 
Black Trace = H1 TMSX M1 (2014−07−29_1090716348), Phase 3a (free-air). 
Magenta Trace = H1 TMSX M1 (2014−07−30_1400), Phase 3a (free-air). 

Summary:

TMSY is exhibiting split L, V, R and P peaks (as expected) and is consistent with previous Phase 3b (in-vacuum) measurements (not shown).

TMSX is a closer match to the model and, interestingly, with the latest measurement the 2nd T DOF peak appears no longer to be split.

Matlab TFs have been running on TMSX again this evening (to verify recovery of split peak), but all looks clear to proceed with the close-out of BSC9 chamber in the morning.  

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