Research and Developments of Advanced Pellet Injector

设计了一种用于先进等离子体加注的重复气动管枪式颗粒喷射器。据估计，这一新概念能够通过原位技术将颗粒形成时间从3-5分钟减少到2-10秒。新制球方法的基本思想是将氢同位素球团通过铜多孔装置输送到管炮式桶中。有两种可能的模式：(1)将液氢同位素推入多孔装置并在筒内重新冻结；(2)将固体氢同位素推入多孔装置至筒内。该原理提供了无限量颗粒的连续注射。为了证明原理证明，进行了几个实验。在手动控制的注入器操作下，以每10-34秒的速度将直径为3mm、长度为3 - 10mm的氢球加速到1.2 km/s。在此经验的基础上，我们成功地在3到4秒内重复了高可靠性。

A pellet injector of repetitive pneumatic pipe-gun type has been designed for advanced plasma fueling applications. This new concept is estimated to be able to reduce the time for pellet formation by an in situ technique from 3-5 minutes to 2-10 seconds. The basic idea of the new approach to pellet formation is to supply a hydrogen isotope pellet through a copper porous unit into a pipe-gun-type barrel. Two modes are possible : (1) to push liquid hydrogen isotope through a porous unit and re-freezing inside of the barrel, (2) to push solid hydrogen isotope through porous unit to the inside of the barrel. This principle provides a continuous injection of an unlimited amount of pellets. For demonstration of the proof-of-principle, several experiments have been carried out. Hydrogen pellets of 3 mm in diameter and 3 to 10 mm in length were accelerated to 1.2 km/s at rate of pellet per 10-34 s with a manually controlled injector operation. On the basis of this experience, we succeeded in 3 to 4 seconds repetition with high reliability.