Electron collection by a negatively charged sphere in a collisionless magnetoplasma
Electron collection by a negatively charged sphere in a collisionless magnetoplasma
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无碰撞磁等离子体中带负电的球体收集电子
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
G. Lapenta
中科院分区：
文献类型：
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作者：
L. Patacchini;I. Hutchinson;G. Lapenta
提出了一种易于评估的近似公式，用于在无碰撞磁化等离子体中由球体收集的排斥种电流，在拉莫尔半径与球体半径之比的整个范围内有效。该形式是由先前的分析参数获得的上下限的适当平均值。该配方能够快速评估的浮动电位在混合玻尔兹曼粒子在细胞（PIC）代码与背景磁场。混合PIC（离子粒子）代码与完整的PIC（电子和离子粒子）代码计算的比较验证的治疗。结果发现，通常没有磁场的值是有效的近似的电子作为完全磁化，但作为未磁化的离子在没有等离子体漂移。
Easy-to-evaluate approximate formulas are presented for the repelled-species current collected by a spherical body in a collisionless, magnetized plasma, valid over the full range of ratio of Larmor radius to sphere radius. The form is an appropriate average of the lower and upper bounds obtained by prior analytic arguments. This formulation enables rapid evaluation of the floating potential in hybrid Boltzmann-particle-in-cell (PIC) codes with a background magnetic field. The treatment is validated by comparison of hybrid PIC (ion particle) code with full PIC (electron and ion particle) code calculations. It is found that typically for no value of magnetic field is it valid to approximate the electrons as fully magnetized but the ions as unmagnetized in the absence of plasma drift.