Velocity–space asymmetry of the trapping boundary of charged particles at and near the magnetic axis of a tokamak
Velocity–space asymmetry of the trapping boundary of charged particles at and near the magnetic axis of a tokamak
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托卡马克磁轴处及其附近带电粒子俘获边界的速度-空间不对称性
DOI：
10.1063/1.871616
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发表时间：
1996
影响因子：
2.2
通讯作者：
T. K. Chu
中科院分区：
文献类型：
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作者：
T. K. Chu
在托卡马克中，捕获粒子的轨迹有一对极向拐点，其中Vz方向相反。当它们在赤道面上聚合时，形成一个滞止点。由于拉莫尔半径有限，因此香蕉宽度有限，穿过停滞点的轨迹具有三重简并性：被困粒子的捏点轨道和肾轨道，以及经过粒子的环轨道。当负V∥粒子从掐点轨道穿过驻点时，粒子的轨迹必须变为环状轨道，粒子成为过路，而正V∥粒子的轨迹必须变为肾轨道，粒子仍然被困住。在v∥中，圈闭边界是不对称的。在局部麦克斯韦等离子体中，捕获粒子的百分比取决于其热粒子的径向距离r和拉莫尔半径。在轴上，捕获比是有限的，被捕获的离子比电子多；普林斯顿贝塔的典型参数…
In tokamaks, the trajectory of a trapped particle has a pair of poloidal turning points where Vz reverses direction. They form a stagnation point when coalescing on the equatorial plane. The trajectories traversing the stagnation point, because of the finite Larmor radius and hence the banana width, have a threefold degeneracy: a pinch orbit and a kidney orbit of a trapped particle, and a loop orbit of a passing particle. When traversing the stagnation point from a pinch orbit, the trajectory of a negative‐V∥ particle must change to a loop orbit and the particle becomes passing, and that of a positive‐V∥ particle must change to a kidney orbit and the particle remains trapped. The trapping boundary is asymmetric in V∥. The percentage of trapped particles in a species in a local Maxwellian plasma depends on the radial distance r as well as on the Larmor radius of its thermal particle. At the axis the trapping ratio is finite and more ions than electrons are trapped; for typical parameters in Princeton Beta ...
影响因子：
3.3
作者：
A. Gibson;T. Sekiguchi;K. Lackner;S. Bodner;R. Hancox
通讯作者：
A. Gibson;T. Sekiguchi;K. Lackner;S. Bodner;R. Hancox
Proc.Int.Conf.on 核形状。
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