A Multi-Beam Terahertz Coaxial Cavity Reflex Klystron

A multi-beam (6 beams) terahertz reflex klystron based on a coaxial cavity is presented. 6 beams instead of 1 beam are used to increase the total direct current and output power. When the beam voltage is 2000V, the single beam current is 5.7mA and the reflection voltage is 2235V, the electromagnetic field of TM110 mode with frequency of 316.54GHz is excited and the output power and electron efficiency are 832mW and 1.2%, respectively.