MBTR Simulations for Different Multibunch Structure Models

This paper reports on simulations undertaken with the code MBTR to explore the emittance growth for various multibunch CLIC structures. Two simplified models of long-range dipole fields are considered and compared with that of a damped structure with frequency discriminated wave guide damping. The second model corresponds to a possible design of a multibunch structure, with damping and moderate detuning, recently studied and showing promising characteristics. The reported simulations carried out with the CLIC main beam parameters of the LC97 workshop corroborate this hope. They show that the vertical emittance growth of a 60-bunch train accelerated to 1 TeV is only a fraction larger than the single-bunch emittance growth, in the same conditions.