Milora S L, Foster C A
Fusion Energy Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830.
Rev Sci Instrum. 1979 Apr;50(4):482. doi: 10.1063/1.1135856.
We describe the design and operation of the solid hydrogen pellet injection system used in plasma refueling experiments on the ISX tokamak. The gun-type injector operates on the principle of gas dynamic acceleration of cold pellets confined laterally in a tube. The device is cooled by flowing liquid helium refrigerant, and pellets are formed in situ. Room temperature helium gas at moderate pressure is used as the propellant. The prototype device injected single hydrogen pellets into the tokamak discharge at a nominal 330 m/s. The tokamak plasma fuel content was observed to increase by (0.5-1.2) x10(19) particles subsequent to pellet injection. A simple modification to the existing design has extended the performance to 1000 m/s. At higher propellant operating pressures (28 bars), the muzzle velocity is 20% less than predicted by an idealized constant area expansion process.
我们描述了用于ISX托卡马克等离子体加料实验的固体氢丸注入系统的设计与运行。枪式注入器基于对横向限制在管内的冷丸进行气体动力学加速的原理运行。该装置由流动的液氦制冷剂冷却，并且丸粒在原位形成。中等压力的室温氦气用作推进剂。该原型装置以标称330米/秒的速度将单个氢丸注入托卡马克放电等离子体中。观察到在注入丸粒后，托卡马克等离子体的燃料含量增加了(0.5 - 1.2)×10(19)个粒子。对现有设计的一项简单改进将性能提升到了1000米/秒。在较高的推进剂工作压力（28巴）下，枪口速度比理想化的等截面膨胀过程预测的速度低20%。
