Design and performance calculations for a Ka-band CHI wiggler ubitron amplifier

Design and performance calculations for a coaxial hybrid iron (CHI) wiggler free-electron laser configuration are presented. The capability of generating high fields at short periods, as well as good beam focusing properties, make it a desirable configuration for high power coherent radiation sources in relatively compact systems. In addition to a description of the geometry, numerical calculations detailing the magnetostatic wiggler fields, the beam dynamics, and the interaction of the beam with the electromagnetic waves in the Ka-band (26–40 GHz) will be presented. Key considerations for the experimental design will be outlined and discussed.