Standing Wave High Gradient Accelerator Structure

A novel type of standing wave linear accelerator structure has been developed at Varian Associates, Inc. This accelerator is an interlaced combination of two side cavity coupled standing wave substructures. An S-band prototype accelerator guide with two identical substructures and total accelerating length of 10cm has been built and successfully tested with a 2MW magnetron. Significant improvement in maximum permissible accelerating gradient was achieved. Output electron beam energy of 4 MeV and corresponding accelerating gradient of 40 MeV/m were experimentally demonstrated. The shunt impedance of the structure corresponds to 83 M??/m.