Grismayer T, Mora P, Adam J C, Héron A
Centre de Physique Théorique, Ecole Polytechnique, CNRS, 91128 Palaiseau, France.
Phys Rev E Stat Nonlin Soft Matter Phys. 2008 Jun;77(6 Pt 2):066407. doi: 10.1103/PhysRevE.77.066407. Epub 2008 Jun 30.
The one-dimensional expansion of a plasma slab is studied using a kinetic description of the electrons based on an adiabatic invariant. The distribution function of the electrons is determined at any time and any position. Solution of the Poisson equation then enables us to determine the electric potential and the ion acceleration. Special attention is devoted to the disassembly time of the plasma slab which appears shorter than expected, due to the distortion of the electron distribution function. The spatial structures of the ion and electron densities and velocities are presented, together with a prediction of the maximum ion velocity. The model is compared to particle-in-cell simulations and excellent agreement is found.
基于绝热不变量，利用电子的动力学描述研究了等离子体平板的一维膨胀。可在任意时刻和任意位置确定电子的分布函数。然后通过求解泊松方程，我们能够确定电势和离子加速度。由于电子分布函数的畸变，等离子体平板的解体时间显得比预期的短，对此给予了特别关注。给出了离子和电子密度及速度的空间结构，以及对最大离子速度的预测。将该模型与粒子模拟进行了比较，发现两者吻合得很好。
