A Synchrotron Frequency Splitting Cavity - Qs Cavity - for the S. R. S. Storage Ring

An additional r.f. cavity powered at a frequency 3h/2 × the orbit frequency is to be installed in the SRS. This modifies the coupled-bunch mode spectrum and thus the guide vessel/beam interaction. In particular the coupled-bunch modes that interact with the r.f. cavity system and with the tune-splitting cavity are themselves coupled and the consequences of this upon the stability of these systems are considered.