A Monte Carlo algorithm for calculating neutral gas transport in cylindrical plasmas
A Monte Carlo algorithm for calculating neutral gas transport in cylindrical plasmas
复制标题
计算圆柱等离子体中中性气体输运的蒙特卡罗算法
DOI：
10.1016/0021-9991(78)90045-1
复制
发表时间：
1978
影响因子：
4.1
通讯作者：
D. Post
中科院分区：
文献类型：
--
作者：
M. Hughes;D. Post
蒙特卡罗技术已被用于计算托卡马克中性气体的分布。该算法采用轨迹长度估计、抑制吸收和俄罗斯轮盘分割等方法来减小方差，使算法具有经济性。由此产生的封装内存需求小，速度相对较快（每个中性密度配置文件的PDP-10 KI时间约为15秒）。托卡马克被建模为一个无限圆柱体，等离子体参数被指定为圆柱体径向坐标的函数。在模型内可以很容易地计算出壁反射和溅射产率的影响。该算法已被纳入一维托卡马克传输码中。该代码还被用于预测电荷交换中性的能谱，这是测量托卡马克离子温度的基础。
Monte Carlo techniques have been used to calculate neutral gas distributions in tokamaks. The algorithm uses track length estimators, suppression of absorption, and splitting with Russian roulette to reduce the variance, so that the algorithm is economic. The resultant package is small in memory requirements and relatively fast ( ∼15 seconds of PDP-10 KI time per neutral density profile). The tokamak is modeled as an infinite cylinder, and the plasma parameters are specified as a function of the radial coordinate of the cylinder. The effects of wall reflection and sputtering yields can be easily computed within the model. The algorithm has been incorporated in a one-dimensional tokamak transport code. The code has also been used to predict the energy spectra of charge-exchange neutrals which form the basis for measurements of ion temperatures in tokamaks.