Investigation of behavior of scrape-off plasma flow in ultra-high beta configuration

场反向构型（FRC）是一种长径比约为10的细长形结构，两端带有磁镜，具有较高的β值，被认为是D-3 He聚变堆的理想选择。因此，由于两端有镜喉，高温堆芯等离子体的刮除等离子体流的行为似乎与托克马克的行为有所不同。本研究项目对高温堆芯等离子体的刮除等离子体流的行为进行了研究。此外，还研究了等离子体流动与堆芯等离子体粒子约束特性之间的相关性。实验结果表明，刮离等离子体流表现出类似磁流体动力学流的特性，镜场强度的增加改善了等离子体的约束特性。此外，我们还发现，通过轴向压缩的分界线半径增加，改善约束和粒子约束时间变得两倍大的中性束注入。

Field Reversed Configuration (FRC) is considered to be a promising candidate for the D-3He fusion reactor because of its high beta value.FRC is elongated in shape, the ratio of length to diameter being about 10 and has magnetic mirror at both ends. Therefore, the behavior of the scrape-off plasma flow from the high temperature core plasma seems to be different from that of tokamaks because of the mirror throat at both ends.In the present research project, the behavior of the scrape-off plasma flow from the high temperature core plasma was investigated. Furthermore, the correlation between the plasma flow and the particle confinement properties of the core plasma was also investigated. The experimental results suggested that the scrape-off plasma flow behaved like the magnetohydrodynamic flow and that the confinement properties were improved by the increment of the mirror field intensity. Furthermore, we have found that by the axial compression the separatrix radius increased and the confinement was improved and that the particle confinement time became two times larger by the neutral beam injection.