[Jeff K Arnaud P]

Following the DTT round of transfer functions ran during monday on the 5 HSTS suspensions of HAM2 and HAM3 chambers, we processed the data today, and the results are plotted in the attached doc. Those measurements have been taken after the optics were cleaned up and the doors were put on. ISIs were damped, HAM3 HEPI unlocked, HAM2 HEPI locked. The first attachment shows a comparison between MC1 MC2 MC3 PRM PR2 of LHO and MC3 of LLO. The second attachement is a zoomed version of the first between 0.1 and 10Hz.

Most of the results look very good and consistent with the model, and there are only a few things to notice :

* MC1 and MC3 have an extra resonance at 0.85Hz in the roll DOF which corresponds to the first vertical mode. This feature will certainly disappear with the vertical DOF damped (to try)

* MC2 has successive poles (1.516Hz and 2.07Hz) and successive zeros (1Hz and 1.094Hz) in the L DOF, which is not something we are used to see in our TFs with collocated actuation and sensing. Though, the feature is very small, and shouldn't raise concerns.