Rf-induced beam dynamics in rf guns and accelerating cavities

Abstract

In this paper, a detailed discussion of the rf-related beam dynamics in rf guns and accelerating cavities is presented. Other rf-gun-related aspects such as space charge and cathode physics are not treated. An effective start phase is introduced in order to yield a better description for the synchronous phase, the energy gain, and the bunch compression factor in gun cavities. Energy spread and longitudinal emittance are treated in a form applicable to guns as well as to accelerating cavities. Discussions on the transverse emittance include the chromatic emittance variation at high emission phases and effects of field asymmetries and combined solenoid-cavity sections.