arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1708.08779physics.plasm-ph
收藏

等离子体中逃逸雪崩的相对论大角度电子碰撞算符

On the relativistic large-angle electron collision operator for runaway avalanches in plasmas

Ola Embréus, Adam Stahl, Tünde Fülöp

摘要:

大角度库仑碰撞导致等离子体中逃逸电子的雪崩产生。我们提出了第一个完全保守的大角度碰撞算子,来自相对论玻尔兹曼算子。与以前的大角度碰撞模型的关系进行了研究,并评估其有效性。我们提出了一种形式的广义碰撞算子,这是适合于在一个数值动力学方程求解器的实施,并展示了失控的电子增长率的影响。最后,我们考虑了反向雪崩效应,失控的大角度碰撞减慢,并表明,运营商的选择是很重要的,如果电场接近雪崩阈值。

英文摘要:

Large-angle Coulomb collisions lead to an avalanching generation of runaway electrons in a plasma. We present the first fully conservative large-angle collision operator, derived from the relativistic Boltzmann operator. The relation to previous models for large-angle collisions is investigated, and their validity assessed. We present a form of the generalized collision operator which is suitable for implementation in a numerical kinetic-equation solver, and demonstrate the effect on the runaway-electron growth rate. Finally we consider the reverse avalanche effect, where runaways are slowed down by large-angle collisions, and show that the choice of operator is important if the electric field is close to the avalanche threshold.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑