High Energy Particle Effect on High - Beta FRC Plasma in Mirror Field

本实验研究的目的是指出并检验高能粒子对简单磁镜场中FRC等离子体的动力学效应。未来在月球表面利用氦-3资源进行核聚变也在本研究范围之内。从15年前至今的FRC形成技术只能应用于石英放电管。FRC等离子体必须在金属室中移位，以便例如使用中性束注入进行高级研究。本文工作实现了将FRC等离子体转移到大口径金属容器中，在准静态场的作用下，形成半径为4倍、长度为5倍、持续时间为5倍的FRC，具有标准束流注入的能力。在此过程中，快速运动的能量在运动后可转化为内部热能，发现约束等离子体外的鞘层深度为约束离子的Larmor半径，这意味着丢失的等离子体表现为动力学运动。在镜像点处逃逸径向区域内的磁通量与覆盖鞘层深度的磁通量一致。这表明逃逸等离子体是沿着磁通道的流体运动，鞘层的形成是动力学的结果，此外，我们还发现在分界线附近存在着一些慢的磁涨落。这一频率范围与理论预测不同。

The purpose of this experimental study is to point out and examine some kinetic effects of high energy particles on FRC plasma confined in a simple magnetic mirror field. The future fusion using helium - 3 resources on the lunar surface is also included in the scope of this work.The FRC formation technique up to the present time since fifteen years ago can be applied only against the quartz discharge tube. The FRC plasma must be translocated in a metal chamber in order to perform the advanced study with a neutral beam injection for instance. It is accomplished by this work that the FRC plasma translated into the large bore metal vessel with a quasi - static field makes the FRC of the four times in radius, the five times in length and the five times in duration which shows the capability of the standard beam injection. The very fast traveling energy in this process can be converted to the internal thermal energy after the movement.The sheath depth outside the confined plasma is found to be of a Larmor radius of the confined ions, which means that the lost plasma behaves as the kinetic motion. The magnetic flux within the escaping radial area at the mirror point coincides with the flux covering the sheath depth. This shows that the escaping plasma flows as fluid motion along the magnetic channel though the sheath formation is due to the kinetic.Additively we find that some slow magnetic fluctuations exist near to the separatrix. This frequency range is different with the theoretical prediction.