Continuum-plasma solution surrounding nonemitting spherical bodies
Continuum-plasma solution surrounding nonemitting spherical bodies
复制标题
围绕非发光球体的连续等离子体溶液
DOI：
10.1063/1.3143038
复制
发表时间：
2009
影响因子：
2.2
通讯作者：
I. Hutchinson
中科院分区：
文献类型：
--
作者：
L. Patacchini;I. Hutchinson
非发射球形体与零平均自由程连续体等离子体相互作用的经典问题在物理上允许的自由参数（电子德拜长度与体半径比、离子与电子温度比和体偏置）的全范围内进行了数值求解，并在严格定义的渐近机制（弱偏置和强偏置、弱屏蔽和强屏蔽、薄护层和厚护层）中进行了解析求解。结果包括连续电子和无碰撞电子的电流-电压特性以及浮电位和电容。我们的数值计算表明，对于大多数物理参数的组合，存在一个最接近的渐近状态，其解析解精度为15%或更好。
The classical problem of the interaction of a nonemitting spherical body with a zero mean-free-path continuum plasma is solved numerically in the full range of physically allowed free parameters (electron Debye length to body radius ratio, ion to electron temperature ratio, and body bias), and analytically in rigorously defined asymptotic regimes (weak and strong bias, weak and strong shielding, thin and thick sheath). Results include current-voltage characteristics as well as floating potential and capacitance, for both continuum and collisionless electrons. Our numerical computations show that for most combinations of physical parameters, there exists a closest asymptotic regime whose analytic solutions are accurate to 15% or better.