Study and Design of a High-Frequency Interaction Cavity for a 140 GHz Megawatts Gyrotron

ZHOU Qiang (周强); SUN Xu (孙旭); LIU Jianwei (刘建卫); LIU Fukun (刘甫坤); ZHAO Qing (赵青)

doi:10.1088/1009-0630/17/1/16

Plasma Science and Technology > 2015 > 17(1): 84-88. > DOI: 10.1088/1009-0630/17/1/16

ZHOU Qiang (周强), SUN Xu (孙旭), LIU Jianwei (刘建卫), LIU Fukun (刘甫坤), ZHAO Qing (赵青). Study and Design of a High-Frequency Interaction Cavity for a 140 GHz Megawatts Gyrotron[J]. Plasma Science and Technology, 2015, 17(1): 84-88. DOI: 10.1088/1009-0630/17/1/16

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Study and Design of a High-Frequency Interaction Cavity for a 140 GHz Megawatts Gyrotron

1 School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China 2 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China

Funds: supported by International S&T Cooperation Program of China (No. 2011DFA63190) and China Postdoctoral Science Foundation (No. 2014M552334)

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Received Date: April 15, 2014

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Abstract

Abstract

The gyrotron is one of the most promising high-power millimeter-wave sources for electron cyclotron resonance heating (ECRH) in controlled thermal nuclear fusion experiments. In this paper, the design of a high-frequency interaction cavity of a 1 MW/140 GHz gyrotron is described in detail. The cavity is designed by using eigen mode analysis and radio frequency (RF) behavior calculation. Rounded transitions at the input and output tapers are designed for reducing mode conversion. With the obtained cavity structure, non-linear self-consistent equations are adopted to calculate its output power and efficiency. A particle-in-cell (PIC) method is used to simulate the beam-wave interaction process for obtaining the resonant frequency and output power of the cavity. The PIC simulation results match considerably well with the results obtained by the non-linear self-consistent calculation. The cavity is currently under construction and will be integrated with other components for overall testing.
- megawatts gyrotron,
- electron cyclotron resonance heating (ECRH),
- mode competition,
- particle-in-cell

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