Design and Experiment of a 220/420-GHz Gyrotron for Nondestructive Evaluation

Author

Wenjie Fu ; Xiaotong Guan ; Chi Chen ; Xiaoyun Li ; Xuesong Yuan ; Yang Yan

Author_Institution

Terahertz Res. Center, Univ. of Electron. Sci. & Technol. of China, Chengdu, China

Volume

61

Issue

7

fYear

2014

fDate

Jul-14

Firstpage

2531

Lastpage

2537

Abstract

We report the design and experiment of a 220/420-GHz gyrotron oscillator for nondestructive evaluation which operates at the fundamental near 220 GHz and the second harmonic near 420 GHz of the electron cyclotron resonance frequency. Through optimizing electron gun for both operation modes, the TE₂₆ mode at 423.1 GHz and the TE₀₃ mode at 221 GHz are observed at output powers up to 8 and 6 kW, respectively, by only changing the beam voltage at a magnetic field of 8.2 T. The experimental results are in reasonable agreement with the design and simulation. In addition, the measurements of potential operation modes with peak output power are also presented in this paper.

Keywords

cyclotron resonance; electron guns; gyrotrons; harmonics; magnetic fields; network synthesis; nondestructive testing; optimisation; oscillators; beam voltage; electron cyclotron resonance frequency; electron gun; frequency 220 GHz; frequency 221 GHz; frequency 420 GHz; frequency 423.1 GHz; gyrotron oscillator; magnetic field; nondestructive evaluation; potential operation modes; second harmonic; Cavity resonators; Electron beams; Gyrotrons; Harmonic analysis; Power generation; Superconducting magnets; Voltage measurement; Fundamental harmonic; gyrotron; nondestructive evaluation; second harmonic; terahertz (THz); terahertz (THz).;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/TED.2014.2322083

Filename

6819820