Jeff. B, R. Kumar

Attached below are the top to top transfer function results for the all metal FC1 suspensions (A+ HSTS) . FC1 is currently sitting outisde the chamber, with 6 BOSEMs attached to the upper mass, connected to SUS PR2 infrastructure. The L, P and V dof looks good when compared to the reference plots. However, for the R, T and Y dof, the resonant peaks and magnitude doesn't tie up well with that of the reference. The results were discussed with S. Aston. As per him, the mode Q's are reasonable for all dof which suggest that the suspension is free of rubbing. However, Stuart suspects that there could be a sign issue - either with the orientation of a magnet on the SUS or with it's digital compensation. To verify this we will try ramping in and out an offset in the COIL OUTPUT filters and see how the OSEM read-back for that channel responds.