New RF design for 11.4 GHz dielectric loaded accelerator

In this paper we present a new solution for externally RF coupled dielectric loaded accelerator. In this scheme, a separate TE-TM converter is used for RF coupling and a short tapered section is used for matching the RF into the dielectric accelerating structure. Advantages of this new design are there is no dielectric presented near the coupler, thus less prone to premature breakdowns; and it can be made into separate modules of coupler, matching and accelerating structures, this will simplified the dielectric structure development because only one set of couplers is required for a defined RF frequency but with many different dielectric structures. An example of X-band 11.424 GHz coupler and dielectric accelerating structure is obtained via EM simulations. Based on the simulation results, a set of coupler, matching and dielectric structures were fabricated. We present bench measurement results and its comparison with the design.