Innovative Modular, Multiple Power Levels, 325 MHz Spokes Cavities Power Couplers

79766S05 In order to increase proton energy up to 8 GeV in a driver linear accelerator, particles must be accelerated through various stages and three different power levels (25kW, 100 kW, and 210kw). Unfortunately, no power coupler element for these cavities has ever been produced using U.S. industrial capabilities. This project will develop innovative modular, multiple power level, 325 MHz spoke cavities power couplers. Phase I will optimize and define the parameters for 325Mhz couplers with alternative planar, cylindrical, or conical windows. Calculations will be made to determine the radio frequency parameters, and to investigate the thermal and stress of the window designs. The calculation will minimize the heat losses to the 4K He cooling system, an assessment of advantages of electric-field vs. magnetic-field coupling will be performed, and a preliminary design concept of a high reliability 100 kW coupler with modular components will be performed. Commercial Applications and Other Benefits as described by the awardee: The modular component design should significantly reduce fabrication costs for the 110 power couplers required for the Fermilab Proton Driver. This modular universal design could be the model for any future cost saving applications in many DOE and industrial accelerator projects.