Wang Gang, Blaskiewicz Michael
Brookhaven National Laboratory, Upton, New York 11973, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2008 Aug;78(2 Pt 2):026413. doi: 10.1103/PhysRevE.78.026413. Epub 2008 Aug 22.
We show that, for a test ion moving in a collisionless single-species electron plasma, exact analytical solutions can be obtained for certain anisotropic velocity distributions of the electron plasma. By comparing the analytical formula with the numerical results calculated for the more realistic Maxwellian plasma, we demonstrate that plasmas with three different velocity distributions behave similarly for ions moving with velocity smaller than the velocity spread of the electrons. Furthermore, we show that the response of the electron density to a rest ion decays exponentially with distance, provided the anisotropic velocity distribution exhibits elliptical symmetry.
我们表明，对于在无碰撞单物种电子等离子体中运动的测试离子，对于电子等离子体的某些各向异性速度分布，可以获得精确的解析解。通过将解析公式与针对更现实的麦克斯韦等离子体计算的数值结果进行比较，我们证明，对于速度小于电子速度展宽的离子，具有三种不同速度分布的等离子体表现相似。此外，我们表明，只要各向异性速度分布呈现椭圆对称性，电子密度对静止离子的响应就会随距离呈指数衰减。
