Sharma Devendra, Ramachandran H
Institute for Plasma Research, Bhat, Gandhinagar 382 428, Gujarat, India.
Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Aug;66(2 Pt 2):026412. doi: 10.1103/PhysRevE.66.026412. Epub 2002 Aug 26.
A source-driven magnetized presheath is analyzed in an obliquely incident magnetic field. The conventional fluid treatments of the collisionless and collisional magnetized presheath use standard fluid equations to recover the velocity profiles that satisfy the Bohm sheath criterion at the electrostatic sheath edge. In a purely source-driven collisionless presheath, however, there is no mechanism to redistribute the change in parallel energy in the perpendicular direction and therefore the boundary values of flow velocities are strong functions of angle of incidence. In the present treatment, numerical solutions are obtained for a set of fluid equations derived from the moment description of a generalized gyrokinetic equation. The density, velocity, and temperature profiles in a source-driven presheath are computed, which show a dependence on the angle of incidence of the magnetic field on a perfectly absorbing solid surface.
在倾斜入射磁场中分析了源驱动的磁化预鞘层。无碰撞和碰撞磁化预鞘层的传统流体处理方法使用标准流体方程来恢复在静电鞘层边缘满足玻姆鞘层准则的速度分布。然而，在纯源驱动的无碰撞预鞘层中，没有机制在垂直方向上重新分配平行能量的变化，因此流速的边界值是入射角的强函数。在本处理中，通过对从广义陀螺动力学方程的矩描述导出的一组流体方程获得了数值解。计算了源驱动预鞘层中的密度、速度和温度分布，结果表明它们依赖于磁场在完全吸收固体表面上的入射角。
