Conveners of the working group are R. Wanzenberg and A. Mosnier. Effects due to strong transient beam loading and excitation of higher order dipole modes are included. At the June meeting beam dynamics simulations have been presented which include the effect of the sixth passband of the 6 m long SBLC accelerating structure. The conclusion from simple scaling arguments is that one can gain luminosity from a higher ac-power to beam power transfer efficiency and a reduced vertical emittance. The consequences for the linac beam dynamics have to be investigated.
First studies consider the longitudinal single bunch dynamics.
Bunch lengthening or a sawtooth instability would harm the bunch compression after the damping ring. Recent results of wakefield calculations for very short bunches in two cavity modules have been presented at the last meeting in Darmstadt. Several fast kickers, similar to those used for the HERA, are needed to apply a sufficient kick to a a 250 GeV beam. The effects on the feedback system due to errors and noise have been studied.