Stirling W L, Ryan P M, Tsai C C, Leung K N
Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830.
Rev Sci Instrum. 1979 Jan;50(1):102. doi: 10.1063/1.1135651.
The magnetic multipole line-cusp device developed by MacKenzie and associates has been adapted for use as a neutral beam ion source. It has produced high-density, large volume, quiescent, uniform hydrogen plasmas, which makes it a potential candidate for use as a plasma generator for neutral beam injectors. The device is a water-cooled cylindrical copper discharge chamber (25 cm in diameter by 36 cm long) with one end enclosed by a set of extraction grids with a 15-cm-diam multi-aperture pattern. The chamber wall serves as an anode and is surrounded by an external system of rare-earth cobalt magnets arranged in a line-cusp geometry of 12 cusps; plasma is produced by electron emission from a hot cathode assembly. This source has achieved extracted beam currents of 12 A at 18.5 kV, radial plasma density uniformities of +/-5% over a 15-cm diameter, noise levels of less than +/-0.5%, and arc efficiencies (beam current/arc power) of 0.6 A/kW.
麦肯齐及其同事研发的磁多极线尖装置已被改造成用作中性束离子源。它能产生高密度、大体积、静态且均匀的氢等离子体，这使其成为中性束注入器等离子体发生器的潜在候选者。该装置是一个水冷式圆柱形铜放电室（直径25厘米，长36厘米），一端由一组具有15厘米直径多孔图案的引出栅格封闭。室壁用作阳极，周围是一个由稀土钴磁体组成的外部系统，这些磁体排列成12个尖点的线尖几何形状；等离子体由热阴极组件发射电子产生。该源在18.5 kV时实现了12 A的引出束流、直径15厘米范围内径向等离子体密度均匀度为±5%、噪声水平低于±0.5%以及弧效率（束流/弧功率）为0.6 A/kW。
