Neutral beam injection benchmark studies for stellarators/heliotrons
Neutral beam injection benchmark studies for stellarators/heliotrons
复制标题
仿星器/日光管的中性束注入基准研究
DOI：
10.1088/0029-5515/30/6/002
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
K. Hanatani
中科院分区：
文献类型：
--
作者：
R. Fowler;R. Morris;J. Rome;K. Hanatani
本文用蒙特卡罗程序研究了中性束注入仿星器/日光管的初始沉积和快离子热化过程。出生沉积模型仔细对待的真空容器的几何形状，包括光束发散，聚焦和孔径损失。热化过程是通过积分快离子的引导中心方程和用蒙特卡罗碰撞算子模拟与等离子体的碰撞来确定的。这个过程可能包括电荷交换和中性重吸收。为了这个基准的目的，我们审查的指导中心方程和蒙特卡罗碰撞算子的不同配方。我们研究了垂直注入Heliotron-E，这是位于等离子体物理实验室在京都大学。Heliotron-E的磁场计算使用Biot-Savart定律与现实的灯丝模型。计算的加热效率的颗粒损失边界的建模和数值程序的敏感性进行检查。比较了三种不同编码的结果。当代码解决同样的问题时，答案相当一致。然而，改变一些建模假设（如损失边界位置）可能会在结果中产生重大差异。
Neutral beam injection in stellarators/heliotrons is studied with Monte Carlo codes that treat the initial beam deposition and the fast-ion thermalization process. The birth deposition model carefully treats the geometry of the vacuum vessel and includes beam divergence, focusing, and aperture losses. The thermalization process is determined by integrating the guiding centre equations of the fast ions and simulating collisions with the plasma by Monte Carlo collision operators. This process may include charge exchange and neutral reabsorption. For the purposes of this benchmark, we review the different formulations of the guiding centre equations and the Monte Carlo collision operators. We studied perpendicular injection into Heliotron-E, which is located at the Plasma Physics Laboratory at Kyoto University. The magnetic fields of Heliotron-E are computed using the Biot-Savart law with realistic filament models. The sensitivity of the computed heating efficiency to the modelling of the particle loss boundary and to the numerical procedures is examined. The results of three different codes were compared. When the codes solve the same problem, the answers agree quite well. However, changing some of the modelling assumptions (such as the loss boundary location) can create significant differences in the results.
影响因子：
3.3
作者：
A. Gibson;T. Sekiguchi;K. Lackner;S. Bodner;R. Hancox
通讯作者：
A. Gibson;T. Sekiguchi;K. Lackner;S. Bodner;R. Hancox