After obtaining clear M1-M1 (top-top) TFs for HAM2 suspensions over the weekend (see LHO aLOG entry 12974), I've now processed data for lower stages as follows:-  

- MC1 M2-M2 undamped (2014-07-27_1090556791_H1SUSMC1_M2_damp_OFF_ALL_TFs.pdf)
- MC3 M2-M2 undamped (2014-07-26_1090419127_H1SUSMC3_M2_damp_OFF_ALL_TFs.pdf)
- PRM M2-M2 undamped (2014-07-26_1090421241_H1SUSPRM_M2_damp_OFF_ALL_TFs.pdf)

- MC1 M3-M3 undamped (2014-07-27_1090565498_H1SUSMC1_M3_damp_OFF_ALL_TFs.pdf)
- MC3 M3-M3 undamped (2014-07-26_1090427890_H1SUSMC3_M3_damp_OFF_ALL_TFs.pdf)
- PRM M3-M3 undamped (2014-07-28_1090609009_H1SUSPRM_M3_damp_OFF_ALL_TFs.pdf)

HAM2 ISI Status: ISI unlocked, ST1 damped, no isolation loops running.

MC1, MC3 & PRM alignment: No offset was applied during this measurement.

The undamped measurements from above, for each stage, have been compared with each other and the model (allhstss_2014-07-28_Phase3a_H1HSTSs_M2_Doff_ALL_ZOOMED_TFs.pdf and allhstss_2014-07-28_Phase3a_H1HSTSs_M3_Doff_ALL_ZOOMED_TFs.pdf).

Summary: 

M2-M2 TFs, show good agreement with the model and are consistent between H1 HSTS suspensions. However, the P DOF exhibits a feature at ~2 Hz present for both MC3 and to a much larger extent PRM. I suspected this to be an artifact of the measurement, therefore, I manually repeated the P DOF TF in DTT, which verified there were no issues with the suspension (see PRM_M2_P_DOF.png below).

M3-M3 TFs, again, these show good agreement with the model and are consistent between H1 HSTS suspensions, thus alleviating any concerns of rubbing.

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