Spontaneous focusing of plasma flow in a weak perpendicular magnetic field

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/107814

Title:	Spontaneous focusing of plasma flow in a weak perpendicular magnetic field
Authors:	陳仕宏;MORITAKA, Toseo;KURAMITSU, Yasuhiro;LIU, Yao-Li;CHEN, Shih-Hung
Contributors:	理學院物理學系
Keywords:	70 PLASMA PHYSICS AND FUSION TECHNOLOGY;CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS;CONCENTRATION RATIO;Diamagnetism;ELECTRONS;FOCUSING;Gyration;HIGH-BETA PLASMA;Inflow;MAGNETIC FIELDS;Magnetism;Particle in cell technique;PARTICLES;Plasma;PLASMA CONFINEMENT;PLASMA DENSITY;Plasma physics;PLASMA SIMULATION;WHISTLER INSTABILITY;WHISTLERS;WINDOWS
Date:	2016-03-01
Issue Date:	2026-04-23 14:26:33 (UTC+8)
Publisher:	Melville: American Institute of Physics
Abstract:	摘要： 0000-0003-2513-0453 Structure formation of high-beta plasma flow in a perpendicular magnetic field is investigated in the ion kinetic regime by a fully kinetic particle-in-cell simulation. We demonstrate that directional plasma flow is spontaneously focused to form a sharp density structure. The primary focusing process comes from field-aligned electron inflow associated with the whistler mode and plasma confinement due to a self-generated magnetic field. The resulting concave magnetic field lines modulate ion gyration to cause a secondary focusing process with significant plasma concentration. Required conditions for these processes are determined by a dimensionless parameter α ≡ βi0(ΔW/ρi0), where βi0, ΔW, and ρi0 denote the plasma kinetic beta, window size, and ion gyration radius, respectively. The focusing process is apparent for small α, whereas diamagnetic expansion is dominant for large α. This condition describes a transition between diamagnetic cavity formation and the focusing process. 出版者： Melville: American Institute of Physics 出版日期： 2016-03-01 出處： Physics of Plasmas, 2016-03, Vol.23 (3) 資源來源： AIP Publishing 版權： AIP Publishing LLC 版權： 2016 AIP Publishing LLC. 識別號： ISSN: 1070-664X 識別號： ISSN: 1527-2419 識別號： ISSN: 1089-7674 識別號： EISSN: 1089-7674 識別號： DOI: 10.1063/1.4942028 識別號： CODEN: PHPAEN
Appears in Collections:	[Department of Physics] journal & Dissertation

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