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Numerical Simulation Study of Double-Beam Magnetron-Injection Guns for High-Power Gyrotrons

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6 Author(s)
Qing Zhao ; Sch. of Phys. Electron., Univ. of Electron. Sci. & Technol. of China, Chengdu ; AiXiang Dong ; Hongfu Li ; Yong Luo
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This paper describes the detailed design of the double-beam coaxial magnetron-injection gun (DBMIG) for use in Ka-band coaxial gyrotron with two beams operating in the harmonic mode. The DBMIG operating voltage is 70 kV with a total beam current of 20 A, evenly divided among the beamlets, and provides two 70-kV 10-A beams with a velocity ratio of 1.5. The minimum of the transverse velocity spread and the axial velocity spread are about 3% and 5%, respectively. The emitter current density has been kept below 10 Amiddotcm-2 (space-charge limited). The primary computational tools used in the design process were the self-consistent particle-in-cell simulation code MAGIC

Published in:

Plasma Science, IEEE Transactions on  (Volume:35 ,  Issue: 2 )

Date of Publication:

April 2007

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