Perpendicular dynamics of runaway electrons in tokamak plasmas
Perpendicular dynamics of runaway electrons in tokamak plasmas
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托卡马克等离子体中失控电子的垂直动力学
DOI：
10.1063/1.4757644
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发表时间：
2012
影响因子：
2.2
通讯作者：
R. Sánchez
中科院分区：
文献类型：
--
作者：
I. Fernández;J. R. Martin;R. Sánchez
在本文中，它将表明，在托卡马克等离子体中的逃逸现象不能减少到一个一维的问题，电场加速和碰撞摩擦损失之间的竞争力的基础上，在平行方向。一个朗之万方法，包括碰撞扩散的速度空间，将被用来分析二维逃逸电子动力学。对速度空间中的逃逸概率的研究将产生一个逃逸准则，该准则将被证明与逃逸动力学的更简单的试验粒子描述所提供的结果一致[Fuchs等人，Phys.Fluids 29，2931（1986）]。电子垂直碰撞散射将被发现发挥重要作用，放松失控的条件。此外，电子俯仰角散射垂直拓宽了失控分布函数，增加了电子人口的失控平台区相比，它应该是预期从电子加速器。
In this paper, it will be shown that the runaway phenomenon in tokamak plasmas cannot be reduced to a one-dimensional problem, based on the competence between electric field acceleration and collisional friction losses in the parallel direction. A Langevin approach, including collisional diffusion in velocity space, will be used to analyze the two-dimensional runaway electron dynamics. An investigation of the runaway probability in velocity space will yield a criterion for runaway, which will be shown to be consistent with the results provided by the more simple test particle description of the runaway dynamics [Fuchs et al., Phys. Fluids 29, 2931 (1986)]. Electron perpendicular collisional scattering will be found to play an important role, relaxing the conditions for runaway. Moreover, electron pitch angle scattering perpendicularly broadens the runaway distribution function, increasing the electron population in the runaway plateau region in comparison with what it should be expected from electron acce...