Numerical and theoretical analysis of the klystrode resonator and collector performance

Design issues related to the resonance cavity and spent beam collector performance for the klystrode, which is an emission-gated (prebunched), single-cavity microwave device, are addressed. Numerical simulations were performed with the fully electromagnetic, two-and-one-half-dimensional, self-consistent particle-in-cell (PIC) code, MAGIC. A set of formulae to predict the resonator performance from startup to saturation was derived in terms of salient parameters. Based on this theory, a one-dimensional optimizing code, KLYDE, was developed to address the design tradeoffs of various resonator parameters. These tools have been used, to investigate the resonator performance over a wide range of parameters with good agreement between MAGIC, KLYDE, and theory. In addition, it has been found that bunch shape and the gap radial focusing properties can play a strong role in the collector localized heating.<>