Vainionpaa Jaakko Hannes, Leung Ka Ngo, Gough Richard A, Kwan Joe W, Levinton Fred
Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
Rev Sci Instrum. 2008 Feb;79(2 Pt 2):02C102. doi: 10.1063/1.2802592.
At the Lawrence Berkeley National Laboratory a diagnostic neutral beam injection system for measuring plasma parameters, flow velocity, and local magnetic field is being developed. The system is designed to have a 90% proton fraction and small divergence with beam current at 5-6 A and a pulse length of approximately 1 s occurring once every 1-2 min. The ion source needs to generate uniform plasma over a large (8 x 5 cm(2)) extraction area. For this application, we have compared rf driven multicusp ion sources operating with either an external or an internal antenna in similar ion source geometry. The ion beam will be made of an array of six sheet-shaped beamlets. The design is optimized using computer simulation programs.
在劳伦斯伯克利国家实验室，正在开发一种用于测量等离子体参数、流速和局部磁场的诊断中性束注入系统。该系统设计为质子份额达到90%，发散度小，束流为5 - 6安培，脉冲长度约为1秒，每隔1 - 2分钟出现一次。离子源需要在大尺寸（8×5平方厘米）的引出区域上产生均匀的等离子体。对于此应用，我们比较了在类似离子源几何结构中使用外部或内部天线运行的射频驱动多尖离子源。离子束将由六个片状束斑阵列组成。使用计算机模拟程序对设计进行了优化。
