P1–10: Study of coaxial output cavity for multiple-beam klystron

A coaxial output cavity with reentrant ring and short circuit pole for multiple-beam klystron (MBK) is presented, which can increase the frequency interval between operating mode TM 310 and neighboring modes to more than 1.0 GHz in X-band, diminish the external Q-factor from 535.4 to 202.2, and make the field distribution of TM 310 mode symmetrical enough. The simulation results are obtained by CST-MWS.