Physical nature of the electric current produced by the asymmetry of particle motion in toroidal magnetic confinement systems
Physical nature of the electric current produced by the asymmetry of particle motion in toroidal magnetic confinement systems
复制标题
环形磁约束系统中粒子运动不对称产生的电流的物理性质
DOI：
10.1134/1.1478526
复制
发表时间：
2002
影响因子：
1.1
通讯作者：
E. Yurchenko
中科院分区：
文献类型：
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作者：
Y. Gott;E. Yurchenko
通过分析托卡马克中带电粒子的漂移轨迹，揭示了一种新的纵向电流，这种电流可以称为不对称电流，因为它与相空间中捕获粒子和过境粒子之间边界的不对称性有关。这种电流的产生可以用这样一个事实来解释，即在一个给定的点上以相反方向穿过磁表面的粒子的运动是有性质差异的。不对称电流是由磁场的环向变化引起的，并由过境粒子的径向动量通量维持。不同种类的粒子对不对称电流密度的贡献与它们的压力成正比，与等离子体参数的梯度无关，在磁轴处最大，并向等离子体外围减小。与标准的新古典理论相反，非对称电流只能从精确的粒子轨迹中找到。计算了具有不同形状磁表面的托卡马克和仿星器模型的非对称电流。通过利用新发现的不对称电流，以及自举电流，有可能大大简化创建托卡马克反应堆的问题。
A new type of longitudinal electric current is revealed by analyzing the drift trajectories of charged particles in a tokamak—the current that may be referred to as the asymmetry current because it is associated with the asymmetry of the boundary between trapped and transit particles in phase space. The generation of this current is explained by the fact that the motions of the particles that cross the magnetic surface at a given point in opposite directions are qualitatively different. The asymmetry current results from the toroidal variations of the magnetic field and is maintained by the radial momentum flux of transit particles. The contribution of the particles of different species to the asymmetry current density is proportional to their pressure, is independent of the gradients of the plasma parameters, is maximum at the magnetic axis, and decreases toward the plasma periphery. In contrast to standard neoclassical theory, the asymmetry current can be found only from exact particle trajectories. The asymmetry current is calculated for tokamaks with differently shaped magnetic surfaces and for a model stellarator. By exploiting the newly revealed asymmetry current, together with the bootstrap current, it may be possible to substantially simplify the problem of creating a tokamak reactor.
K.Uo 等人：第 11 届等离子体物理和受控核聚变研究会议（京都）。
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