Simulation and Experiment of a Ku-Band Gyro-TWT

Author

Jianxun Wang ; Yong Luo ; Yong Xu ; Ran Yan ; Youlei Pu ; Xue Deng ; Hai Wang

Author_Institution

Sch. of Phys. Electron., Univ. of Electron. Sci. & Technol. of China, Chengdu, China

Volume

61

Issue

6

fYear

2014

fDate

Jun-14

Firstpage

1818

Lastpage

1823

Abstract

Design techniques and experimental results are presented on a Ku-band TE₁₁ mode gyro-traveling wave tube. The hot test of this amplifier gives more than 153-kW output power, 2.3-GHz bandwidth (14%), 41-dB saturated gain, and 20% efficiency driven by a 63 kV, 12-A electron beam with a pitch angle (v_tv_z) of 1.2, and velocity spread of 5%. A linear polarized TE₁₁ mode input coupler is used to introduce the input power. The stability of the amplifier from oscillation, including both the operating TE₁₁ mode and the backward wave TE₂₁ mode, has been investigated with linear codes, nonlinear selfconsistent theory, and 3-D PIC CHIPIC simulation. To suppress the potential gyro-backward wave oscillator interactions, the high frequency circuit is loaded with lossy ceramic rings. The lossy structure is optimized by nonlinear theory and 3-D PIC simulation. A low velocity spread magnetron injection gun is designed with a new structure.

Keywords

gyrotrons; linear codes; millimetre wave couplers; travelling wave amplifiers; travelling wave tubes; 3D PIC CHIPIC simulation; Ku-Band gyro-TWT; Ku-band TE₁₁ mode gyro-traveling wave tube; amplifier stability; bandwidth 2.3 GHz; current 12 A; design techniques; efficiency 20 percent; electron beam; gain 41 dB; gyro-backward wave oscillator interaction suppression; high frequency circuit; linear codes; linear polarized TE₁₁ mode input coupler; lossy ceramic rings; lossy structure; low velocity spread magnetron injection gun; nonlinear self-consistent theory; nonlinear theory; pitch angle; voltage 63 kV; Bandwidth; Couplers; Integrated circuit modeling; Oscillators; Power generation; Solid modeling; Superconducting magnets; ${rm TE}_{11}$ mode; Absolute instability; Ku-band; TE₁₁ mode.; gyro-TWT; high power millimeter-wave amplifier; lossy ceramic; magnetron injection gun (MIG);

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/TED.2013.2296552

Filename

6783728