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磁化同轴枪是一种高效的等离子体注入装置，在核聚变注料、宇宙射流模拟和磁重联研究中具有重要的应用价值。本文基于高速成像和磁场测量技术，观察到球马克、扩散与射流三种磁化同轴枪放电过程中的典型模式，并系统研究了不同模式下等离子体的动力学特征。其后结合理想磁流体力学（MHD）理论，对不同模式下等离子体的磁场位形、旋转行为与轴向运动的内在机制进行了深入分析。结果表明，球马克模式下，等离子体达到泰勒弛豫状态，实现整体匀速旋转，形成稳定的紧凑环（CT）结构；在扩散模式中，偏置磁场较强导致旋转速度较大，离心力增强，进而引发剧烈的径向扩散；射流模式中，由于偏置磁场较弱，等离子体聚集于内电极头部，呈现 箍缩 效应，最终形成具有轴向不稳定性的射流柱结构。该研究结果不仅加深了对磁化同轴枪放电物理过程的认识，也为数值模拟与高效等离子体源的设计提供了一定的实验基础和理论支持。The magnetized coaxial gun is an efficient plasma injection device with significant applications in fusion fueling, astrophysical jet simulation, and magnetic reconnection studies. In this work, three typical discharge regions—spheromak region, diffusive region, and jet region—were observed using high-speed imaging and magnetic field measurements. The dynamic characteristics of the plasma in each region were systematically investigated. Based on ideal magnetohydrodynamic (MHD) theory, the magnetic field configurations, rotational behavior, and axial motion mechanisms of the plasma in different regions were carefully analyzed. The results show that in the spheromak region, the plasma reaches a Taylor-relaxed state, exhibits uniform rotation, and forms a stable compact torus (CT) structure. In the diffusive region, a relatively strong bias magnetic field leads to faster rotation, enhanced centrifugal force, and consequently, intense radial diffusion. In the jet region, due to the weaker bias field, the plasma accumulates at the tip of the inner electrode, exhibiting a clear pinch effect and forming a jet with axial instability. These findings not only deepen the understanding of the discharge physics of magnetized coaxial guns but also provide valuable experimental and theoretical support for numerical simulations and the development of efficient plasma sources.
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Keywords:
- magnetized coaxial plasma gun /
- spheromak /
- plasma dynamics /
- ideal MHD
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[1] Qi L W 2022Ph. D. Dissertation (Dalian University of Technology) (in Chinese) [漆亮文2022博士学位论文(大连：大连理工大学)]
[2] Dong Q, Kong D, Wu X, Ye Y, Yang K, Lan T, Chen C, Wu J, Zhang S, Mao W, Zhao Z, Meng F, Zhang X, Huang Y, Bai W, Yang D, Wen F, Zi P, Li L, Hu G, Zhang S, Zhuang G 2022Plasma Science and Technology 24025103
[3] Dong Q, Zhang J, Lan T, Xiao C, Zhuang G, Chen C, Zhou Y, Wu J, Long T, Nie L, Lu P, Wang T, Wu J, Deng P, Wang X, Bai Z, Huang Y, Li J, Xue L, Yolbarsop A, Mao W, Zhou C, Liu A, Wu Z, Xie J, Ding W, Liu W, Chen W, Zhong W, Xu M, Duan X 2024Plasma Science and Technology 26075102
[4] Matsumoto T, Sekiguchi J, Asai T, Gota H, Garate E, Allfrey I, Valentine T, Morehouse M, Roche T, Kinley J, Aefsky S, Cordero M, Waggoner W, Binderbauer M, Tajima T 2016Review of Scientific Instruments 87053512
[5] Lan T, Chen C, Xiao C, Ding W, Wu J, Mao W, Zhang S, Kong D, Zhang S, Wu Z, Dong Q, Zhou Y, Xu H, Wu J, Wei Z, Wen X, Wang H, Zhou C, Liu A, Li H, Xie J, Liu W, Zhuang G 2024Plasma Science and Technology 26105102
[6] Tan M, Ye Y, Kong D, Dong Q, Zhao Z, Li Y, Li B, Wen F, Huang Y, Tang L, Li T, Zi Z, Zhong F, Pei M, Liu X, Zhang X, Zhang S 2024Fusion Engineering and Design 205114559
[7] Moser A L, Bellan P M 2012Nature 482 379
[8] Bellan P M 2018Journal of Plasma Physics 84755840501
[9] Bellan P M 2018Plasma Physics and Controlled Fusion 60019501
[10] Zhao H L, Zhang Y W, Yang L P, Huang H, Ma T 2024Systems Engineering and Electronics 46262
[11] Cheng J, Tang H-B, York T M 2014Physics of Plasmas 21063501
[12] Zhao F-T, Song J, Zhang J-S, Qi L-W, Zhao C-X, Wang D-Z 2021Acta Physica Sinica 70205202[赵繁涛,宋健,张津硕,漆亮文,赵崇霄,王德真2021物理学报70205202]
[13] Geddes C G R, Kornack T W, Brown M R 1998Physics of Plasmas 5 1027
[14] Yee J, Bellan P M 2000Physics of Plasmas 7 3625
[15] Hsu S C, Bellan P M 2005Physics of Plasmas 12 032103
[16] (in American)
[17] Byvank T, Endrizzi D A, Forest C B, Langendorf S J, McCollam K J, Hsu S C 2021Journal of Plasma Physics 87905870102
[18] Kaur M, Barbano L J, Suen-Lewis E M, Shrock J E, Light A D, Schaffner D A, Brown M B, Woodruff S, Meyer T 2018Journal of Plasma Physics 84905840114
[19] Qi L, Song J, Zhao C, Bai X, Zhao F, Yan H, Ren C, Wang D 2020Physics of Plasmas 27122506
[20] Zhang J-L, Yang L, Yan H-J, Hua Y, Ren C-S 2015Acta Physica Sinica 64075201[张俊龙,杨亮,闫慧杰,滑跃,任春生2015物理学报64075201]
[21] Yu X, Qi L-W, Zhao C-X, Ren C-S 2020Acta Physica Sinica 69035202[余鑫,漆亮文,赵崇霄,任春生2020物理学报69035202]
[22] Guo H S, Yang L J, Liu S 2020Nuclear Fusion and Plasma Physics 40 86
[23] Zhao C-X, Qi L-W, Yan H-J, Wang T-T, Ren C-S 2019Acta Physica Sinica 68105203[赵崇霄,漆亮文,闫慧杰,王婷婷,任春生2019物理学报68105203]
[24] Romero-Talamás C A, Bellan P M, Hsu S C 2004Review of Scientific Instruments 75 2664
[25] Taylor J B 1986Reviews of Modern Physics 58 741
[26] Schaffer M J 1987The Physics of Fluids 30 160
[27] Jarboe T R 1989Fusion Technology 15 7
[28] Solomon M "Large Sample Statistical Study of Three-Dimensional Magnetic Reconnect" by Solomon Murdock,'24
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