Development of Ka-band Extended-Interaction Klystron

This paper presents the design and the results for a Ka-band Extended-Interaction Klystron working at 2π mode. The electron gun, the permanent magnetic focusing system, the extended-interaction technology performance are calculated by computer simulation. After testing Klystron, the peak output power is over 10KW, average power is over 500W. gain is over 30dB and bandwidth is over 300MHz.