Development of compact torus injector

聚变反应堆的燃料(氢和氚)在室温下是气态的，不能储存在聚变反应堆中。因此，聚变燃料必须像汽车燃油喷射一样从外部连续供给。在未来的大型聚变反应堆中，现有的燃料技术(如冰球注入)可能不够充分，特别是如果需要在等离子体堆芯直接进行燃料的话。聚变反应在等离子体温度和密度都较高的核心处最为活跃。核心燃料将有另一个重要的优势。在燃烧托卡马克等离子体中，很大一部分帕斯玛电流是作为引导电流自驱动的，而引导电流敏感地依赖于径向等离子体压力分布。自举电流的优化需要对等离子体压力分布进行主动控制，而这只能通过控制燃料来实现。

The fuels for fusion reactors (deuterium and tritium) are in gaseous state at room temperature and cannot be stored in a fusion reactor. Fusion fuels thus have to be continuosly fed externally as in automobile fuel injection. In large fusion reactors in the future, the exiting fueling technologies (e.g., ice pellet injection) may not be adequate particularly if direct fueling at the plasma core is required. Fusion reactions are most active at the core where both plasma temperature and density are high. Core fueling will have another important advantage. In burning tokamak plasma, a large fraction of palsma current is self-driven as the boot strap current which sensitively depends on the radial plasma pressure profile. Optimization of the bootstrap current requires active control of plasma pressure profile which can only be achieved by control of fueling.