Beam-Driven Currents in the 1/ν Regime in a Helical System
Beam-Driven Currents in the 1/ν Regime in a Helical System
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螺旋系统中 1/ν 范围内的束驱动电流
DOI：
10.1143/jpsj.59.3595
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发表时间：
1990
影响因子：
1.7
通讯作者：
M. Okamoto
中科院分区：
文献类型：
--
作者：
N. Nakajima;M. Okamoto
在1/ν碰撞区研究了中性粒子注入螺旋系统（仿星器、Heliotron/Torsatron）中的束流。通过求解电子漂移动力学方程，得到了任意磁场位形下束流驱动电流的一般表达式。发现F = Jnet/ J B（J net为净束流，J B为快离子束流）随ft和Zeff的增大而增大，其中ft为俘获电子分数，Zeff为有效离子电荷数.特别地，对于Z eff 1，俘获电子的影响很大，并且F与ft大致成比例。另一方面，如果\（Z_{\text{eff}}\gtrsim3\），则俘获电子的影响变小。
Beam currents driven by a neutral particle injection in a helical system (stellarator, heliotron/torsatron) are studied in the 1/ν collisionality regime. The general expression for the beam-driven current is obtained for arbitrary magentic field configurations by solving the drift kinetic equation for electrons. It is found that F = J net / J b ( J net is the net current and J b is the fast ion beam current) increases as f t and Z eff where f t is the fraction of trapped electrons and Z eff is the effective ionic charge number. Especially, for Z eff ≃1 the effect of trapped electrons is large and F is roughly proportional to f t . On the other hand, if \(Z_{\text{eff}}\gtrsim3\) the effect of trapped electrons becomes small.