Investigation on the multi-hole directional coupler for power measurement of the J-TEXT ECRH system

Wenting WENG; Donghui XIA; Yizhe TIAN; Xixuan CHEN; Zhijiang WANG; Yuan PAN

doi:10.1088/2058-6272/ac5d7b

Plasma Science and Technology > 2022 > 24(6): 065602. > DOI: 10.1088/2058-6272/ac5d7b

Wenting WENG, Donghui XIA, Yizhe TIAN, Xixuan CHEN, Zhijiang WANG, Yuan PAN. Investigation on the multi-hole directional coupler for power measurement of the J-TEXT ECRH system[J]. Plasma Science and Technology, 2022, 24(6): 065602. DOI: 10.1088/2058-6272/ac5d7b

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Investigation on the multi-hole directional coupler for power measurement of the J-TEXT ECRH system

The International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China

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Corresponding author:
Donghui XIA, E-mail: xiadh@hust.edu.cn
Received Date: December 11, 2021
Revised Date: March 11, 2022
Accepted Date: March 13, 2022
Available Online: December 12, 2023
Published Date: May 18, 2022

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Abstract

Abstract

Power measurement is necessary for an electron cyclotron resonance heating (ECRH) system. The directional coupler method has been put forward to monitor high-power microwave from gyrotrons in real time. A multi-hole directional coupler has been designed and manufactured for the 105 GHz/500 kW ECRH system on the J-TEXT tokamak. During the design process, we established the relationships between hole parameters and coupling characteristics based on the multi-hole coupling method and small-hole coupling theory. High-power tests have been carried out. The results indicated the reasonability of the theoretical design and practicality of the fabricated directional coupler. Sources of test errors have been discussed in detail, and the influences of spurious modes on the directional couplers have been emphatically analyzed.
- directional couplers,
- power measurement,
- ECRH system

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Acknowledgments

This work was supported by the National Key Research and Development Program of China (Nos. 2017YFE0300200 and 2017YFE0300204), and in part by National Natural Science Foundation of China (No. 51821005).

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