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Negative hydrogen ion transport in RF-driven ion sources for ITER NBI

机译：用于ITER NBI的RF驱动离子源中的负氢离子迁移

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摘要

The injection of energetic neutral atoms is a major component of plasma heating in fusion experiments. In order to fulfill the requirements of the ITER neutral beam injection (NBI), a RF-driven ion source for negative ions has been developed at the MPI fur Plasma Physik (IPP Garching). Negative hydrogen ions are generated on a converter surface by impinging neutral particles and positive ions under the influence of magnetic fields and the plasma sheath potential. A 3D negative ion trajectory calculation including a Monte Carlo description of reactions and collisions with plasma particles was used to calculate the total and spatially resolved extraction probabilities for realistic field topologies and geometries of the large scale extraction system LAG. The experimentally observed increase in extracted ion current by the use of chamfered aperture collars agrees with the results of the ion transport simulation. Profiles of the extraction probability on the converter show that most of the extracted negative ions are created in the vicinity of the plasma grid apertures. These areas of intensified extraction probability are influenced by the magnetic field configuration. The ion extraction probability is affected by the long ranging magnetic filter field. The short ranging electron deflection field, however, which is generated by magnets near the converter surface, does not significantly influence the extraction probability.
机译：高能中性原子的注入是聚变实验中等离子体加热的主要组成部分。为了满足ITER中性离子束注入（NBI）的要求，在MPI毛皮等离子物理技术（IPP Garching）上开发了负离子的RF驱动离子源。在磁场和等离子鞘层电势的影响下，通过撞击中性粒子和正离子，在转换器表面上会产生负氢离子。使用3D负离子轨迹计算（包括反应和与等离子体粒子碰撞的蒙特卡洛描述）来计算大规模提取系统LAG的实际场拓扑和几何形状的总和空间分辨提取概率。通过使用倒角孔环在实验上观察到的提取离子电流的增加与离子传输模拟的结果一致。转换器上提取概率的曲线表明，大多数提取的负离子是在等离子栅孔附近产生的。这些增强的提取概率区域受到磁场配置的影响。离子提取的可能性受长距离磁过滤器场的影响。然而，由转换器表面附近的磁体产生的短程电子偏转场不会显着影响提取概率。

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