Simulations of transport and RF power production in a 35-GHz relativistic klystron

A current experiment is underway to study beam dynamics and RF production in a 35-GHz relativistic klystron using a 1-kA, 7-MeV electron beam produced by the PIVAIR accelerator. We present simulations of transport in the PIVAIR accelerator, modulation from a free-electron laser interaction, post-wiggler solenoidal transport, and interaction with two RF cavities. These simulations are performed with a suite of various codes. Steady-state and transient effects are discussed. The calculated transverse and longitudinal profiles of the beam are compared with experimental diagnostic measurements.