Abstract:

The drift of particle guiding centre caused by curl B in a static inhomogeneous magnetic field is investigated by means of three-dimensional vector arithmetic. The drift related to the charged particle velocity perpendicular to the magnetic field is divided into two terms, respectively described by B curvature and curl B. Consequently the representation of curl B drift in a toroidal magnetic field is given, and the possible effect on orbits of passing particle and trapped particle due to curl B drift in a toroidal magnetic field is discussed. The results demonstrate that the drift due to the charged particle velocity perpendicular to the magnetic field is mainly determined by B curvature, and the effect of the curl B on the drift is minor.

Key words: Magnetic field effects, Drift instability, Orbits

摘要：

讨论了静态非均匀磁场中的磁场旋度对带电粒子引导中心漂移的影响。运用三维矢量分析的方法，将带电粒子垂直于磁场运动所引起的磁场漂移分为两项，分别由磁场的曲率和磁场的旋度决定。给出了螺旋状环形磁场中由磁场旋度引起的磁场漂移的近似表达式，讨论了该漂移成分对于该磁场中通行粒子轨道和捕获粒子轨道的可能影响。结果表明，带电粒子垂直于磁场运动所引起的磁场漂移主要由磁场的曲率决定，而磁场旋度对该漂移的影响比较微弱。

关键词: 磁场的效应, 漂移不稳定性, 轨道