PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Wave field structure and power coupling features of blue-core helicon plasma driven by various antenna geometries and frequencies |
Chao Wang(王超)1,3, Jia Liu(刘佳)2, Lei Chang(苌磊)1,†, Ling-Feng Lu(卢凌峰)3, Shi-Jie Zhang(张世杰)1, and Fan-Tao Zhou(周帆涛)1 |
1 State Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China; 2 Shanghai Institute of Space Propulsion, Shanghai 201112, China; 3 Southwestern Institute of Physics, Chengdu 610041, China |
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Abstract This paper deals with wave propagation and power coupling in blue-core helicon plasma driven by various antennas and frequencies. It is found that compared to non-blue-core mode, for blue-core mode, the wave can propagate in the core region, and it decays sharply outside the core. The power absorption is lower and steeper in radius for blue-core mode. Regarding the effects of antenna geometry for blue-core mode, it shows that half helix antenna yields the strongest wave field and power absorption, while loop antenna yields the lowest. Moreover, near axis, for antennas with m = +1, the wave field increases with axial distance. In the core region, the wave number approaches to a saturation value at much lower frequency for non-blue-core mode compared to blue-core mode. The total loading resistance is much lower for blue-core mode. These findings are valuable to understanding the physics of blue-core helicon discharge and optimizing the experimental performance of blue-core helicon plasma sources for applications such as space propulsion and material treatment.
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Received: 01 November 2023
Revised: 05 December 2023
Accepted manuscript online: 12 December 2023
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PACS:
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52.35.Hr
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(Electromagnetic waves (e.g., electron-cyclotron, Whistler, Bernstein, upper hybrid, lower hybrid))
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52.50.Qt
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(Plasma heating by radio-frequency fields; ICR, ICP, helicons)
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52.70.Ds
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(Electric and magnetic measurements)
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41.20.Jb
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(Electromagnetic wave propagation; radiowave propagation)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 92271113), the Fundamental Research Funds for the Central Universities (Grant No. 2022CDJQY-003), Chongqing Entrepreneurship and Innovation Support Program for Overseas Returnees (Grant No. CX2022004), and the Fund from Shanghai Engineering Research Center of Space Engine (Grant No. 17DZ2280800). |
Corresponding Authors:
Lei Chang
E-mail: leichang@cqu.edu.cn
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Cite this article:
Chao Wang(王超), Jia Liu(刘佳), Lei Chang(苌磊), Ling-Feng Lu(卢凌峰), Shi-Jie Zhang(张世杰), and Fan-Tao Zhou(周帆涛) Wave field structure and power coupling features of blue-core helicon plasma driven by various antenna geometries and frequencies 2024 Chin. Phys. B 33 035201
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