论文标题
一种通用的玻尔兹曼动力学理论，用于磁性等离子体，并应用于摩擦
A Generalized Boltzmann Kinetic Theory for Strongly Magnetized Plasmas with Application to Friction
论文作者
论文摘要
等离子体中的库仑碰撞通常是使用玻尔兹曼碰撞算子或其变体进行建模的，该变体适用于弱磁化等离子体，其中典型的颗粒粒子的gyroradius显着超过了debye的长度。相反，奥尼尔（O'Neil）开发了一种动力学理论，可以对等离子体进行强烈磁化，以至于典型的颗粒旋律远小于二进制碰撞中最接近方法的距离。在这里，我们开发了一个广义碰撞操作员，该撞击量适用于整个磁化强度。为了证明与强磁化相关的新型物理学，它用于在大规模的测试电荷上计算摩擦力。除了传统的停止功率组件外，还发现了横向成分，该横向分量垂直于强烈磁化的策略中的速度和洛伦兹力量，正如最近使用线性响应理论所预测的那样。在同时适用的碰撞理论和线性响应理论之间发现了良好的一致性，但是新的碰撞理论也适用于比线性响应理论预期适用的更强的磁化强度制度。
Coulomb collisions in plasmas are typically modeled using the Boltzmann collision operator, or its variants, which apply to weakly magnetized plasmas in which the typical gyroradius of particles significantly exceeds the Debye length. Conversely, O'Neil has developed a kinetic theory to treat plasmas that are so strongly magnetized that the typical gyroradius of particles is much smaller than the distance of closest approach in a binary collision. Here, we develop a generalized collision operator that applies across the full range of magnetization strength. To demonstrate novel physics associated with strong magnetization, it is used to compute the friction force on a massive test charge. In addition to the traditional stopping power component, this is found to exhibit a transverse component that is perpendicular to both the velocity and Lorentz force vectors in the strongly magnetized regime, as was predicted recently using linear response theory. Good agreement is found between the collision theory and linear response theory in the regime in which both apply, but the new collision theory also applies to stronger magnetization strength regimes than the linear response theory is expected to apply in.
