J-TEXT Tokamak Device Realized Electron Cyclotron Resonance Heating for the First Time

May 29, 2019 (Correspondents Chen Xixuan and Li Jianchao) On May 24, the J-TEXT Tokamak device of Institute of Fusion and Plasma Research of School of Electrical and Electronic Engineerin realized electron cyclotron resonance heating (ECRH) for the first time, and plasma electron temperature was increased by 50%, successfully breaking through 14 million degrees Celsius. A key step has been taken towards advanced physical experimental research.

ECRH system

J-TEXT discharged 300 kw and effect of ECRH injected power

Soft X-ray radiation profile variation before and after ECRH heating

The J-TEXT device of School of Electrical and Electronic Engineering is the only large and medium-sized Tokamak device in Chinese universities, and the conventional heating mode is ohmic heating. In order to effectively improve the operating range of J-TEXT device, Wang Zhijiang and Xia Donghui team of Institute of Fusion and Plasma Research started the research and development of ECRH system at the end of 2016, and completed the debugging of the system on April 12, 2019. On this basis, through more than a month of intensive preparation, the operating parameters of the J-TEXT device and the ECRH system were optimized. On the afternoon of May 24, 2019, microwave power was successfully injected into the device, and obvious heating effect was observed. The first electron cyclotron resonance heating experiment was completed.

Electron cyclotron wave has the advantages of good power deposition locality, high coupling efficiency, the emission antenna far away from the plasma boundary, etc. It is a plasma heating method preferred by the steady-state large-size superconducting fusion device (such as ITER, W7-X) and the future fusion demonstration reactor. Since this year, the J-TEXT device has successfully completed the debugging of the ECRH system and the first microwave injection experiment. The next step will focus on the physical experimental research under high parameter conditions

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