Investigation on the multi-hole directional coupler for power measurement of the J-TEXT ECRH system |
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| Affiliation: | 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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| 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. |
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| Keywords: | directional couplers power measurement ECRH system |
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