Wake fields and beam dynamics simulations for the 3.9-ghz cavities of the ILC

Abstract

Crab cavities are used for the ILC in order to increase the luminosity of the colliding beams at the interaction point. These cavities operate at the 3rd harmonic of the accelerating frequency. 1.3GHz. We study the LOM (Lower Order Modes) and HOM (Higher Order Modes) excited by the beam. The corresponding wake field is calculated and simulations are conducted on the beam dynamics of the interaction of the wake field with the multi-bunch beam train