Multi-layered waveguide DC electrical break for the PEFP microwave proton source

Abstract

A microwave proton source has been developed and is being used for 50-keV proton injection to the 20-MeV proton linac of the Proton Engineering Frontier Project (PEFP). It includes a 2-kW rf system for plasma generation. Because the rf system is electrically connected to a high-voltage beam extraction power supply, it is not easy to operate, control and maintain the rf system on the high-voltage platform. A 50-kV DC break has been developed on the waveguide between the proton source and the rf generator, and has been compared with the waveguide without the DC break. The results show the same operation performances, with very low radiation loss and no electrical breakdown, and will be helpful for easy operation and maintenance of the proton injector for the 100-MeV proton linac.