Development on FRC Plasma Sustainment Method for Helium-3 Fusion

背景实现氘-氦-3聚变需要发展高β位形的等离子体，而不需要低β的环形等离子体（如托卡马克）。FRC研究的关键问题之一是找到维持FRC等离子体的途径。研究了磁约束的特性和改善方法，发展了中性束注入和磁压缩的方法。粒子约束时间已被许多仪器深入研究，并发现为0.3ms。随着镜比的增大，时间也会延长。2.在磁压缩实验中，80%的轴向压缩提供了适合聚变堆芯的更胖的FRC形状，并表现出约束时间的延长。3.通过研制一种新型IGBT控制电源，安装了一台500 KW级大功率束流注入器。目前正在低功率下获得有关注入的物理数据，这是开发新的粒子探测器所需要的。

Back ground Realization of deuterium-helium-3 fusion requires the development of high-beta plasma configuration above 50%, insead of low-beata toroids like as tokamaks.Objective For the requirement a field-reversed-configuration (FRC) plasma has been acceptable, which has the beta value of 90%. One of the most crucial problems in FRC study is to found the rout to the sustainment of the FRC plasma. It is, for the purpose, to study the characteristics and the improvement of the confinement, and to develop the methods of neutral beam injection and magnetic compression.Results 1. The particle confinement time has been intensively studied by many instruments, and is found to be 0.3ms. Also, the time could be extended with increasing of the mirror ratio. 2. In the magnetic compression experiment ; 80% axial compression has offered the more fat FRC shape suitabe for the fusion core, and exibites the extention of confinement time. 3. By development of a new power suplier with IGBT control, a high power beam injector of 500KW class has been installed. Physics data on the injection are now being obtained in a low level power, where it is needed to develop some new particle detector.