小环径比托卡马克中粒子的捕获条件

Trapping condition of particles in low-aspect ratio tokamaks

为了研究小环径比托卡马克中粒子运动不同于大环径比的特点 ,探讨了标准模型磁场下单粒子在小环径比托卡马克中的运动 ,通过对环径比量级的假设采用漂移近似得到了保留至高阶项的导心运动方程。在对大环径比托卡马克的捕获条件进行推广的基础上 ,推导了具有较小环径比的托卡马克装置的捕获条件 ,并得到捕获粒子的比例会高于大环径比托卡马克的结论。

The motion of particles in a low aspect ratio tokamak was investigated using the drift approximation, with a standard model for the magnetic field and the assumption of the order of aspect ratio. The equations were developed for the motion of a single particle in a low aspect ratio tokamak. The criterion for the orbit types in large aspect ratio tokamaks was extended. The corresponding criterion in low aspect ratio tokamaks was derived and the fraction of trapped particles was found to be higher than in large aspect ratio tokamaks.