Window Materials Design and Properties for Use in High Power Klystrons

This paper discusses the design of and material for klystron output windows to be used on the Stanford 20-GeV linear accelerator. Alternative window geometries are considered in view of the requirements of the SLAC application. Criteria for choice of window material are presented along with physical properties of several dielectric materials, and results of experimental evaluations of various window materials are described. The necessity for, and effectiveness of, techniques for reducing multipactor are discussed. Reasons are given for the choice of the present SLAC klystron window.