Design of S-Band accelerator structure utilizing 2.45 GHz magnetron

Abstract

This work presents the design of a side-coupled standing wave accelerator structure operating in S-band resonant frequency. It consists of cavity cells, side coupling cells, a power coupling cavity cell, a waveguide structure, and a magnetron operating in an S-band frequency regime. It was designed to use a more commercially available magnetron (a frequency range of 2445 to 2465 MHz). Electromagnetic analysis was performed using CST Microwave Studio’s electromagnetic field eigenmode, time domain, and PIC solvers. A cavity cell design was obtained with Q 0 of 20288 and a shunt impedance of 96.247 MΩ. The multi-cavity structure is side coupled and operates in mode at 2453.835 MHz with a quality factor of 13376. A power coupler with a width of 1.3 cm and length of 2.9 cm transfers the RF power through a WR340 waveguide into the cavity with minimal loss. The total structure length was 52.17 cm. We achieved a peak accelerating gradient of about 22.1 MV/m at 1 Joule of stored energy and calculated a beam peak energy of 4.535 MeV.