FRC合并与压缩的混合模拟
Hybrid simulations of FRC merging and compression
AI总结：
本文采用流体电子与全轨道动力学离子的二维混合模拟研究FRC合并与压缩，并与HYM代码的MHD结果对比，揭示初始参数影响及磁镜场促进完全合并的作用。
摘要：
为了加快Helion Energy开发的脉冲聚变概念的发展，需要更好地理解场反位形（Field Reversed Configuration，FRC）在高加速度和压缩磁场中的合并与稳定性。此前关于FRC合并与压缩的所有理论和模拟工作均采用二维MHD模型。本文给出了FRC合并与压缩的新型二维混合模拟（流体电子和全轨道动力学离子）结果。使用HYM代码计算的动力学模拟与MHD模拟结果得到了比较和分析。在没有轴向磁压缩的情况下，MHD和混合模拟均表现出对初始参数（即FRC间距、速度、归一化分界面半径和等离子体黏度）的高度敏感性，表明具有大拉长比和分界面半径的FRC要么不合并，要么部分合并，形成双FRC。结果表明，在FRC端部施加强度不断增大的磁镜线圈场，可在MHD和动力学模拟中促使FRC快速且完全合并。
英文摘要：
An improved understanding of Field Reversed Configuration (FRC) merging and stability in high acceleration and compression magnetic fields is needed to speed up the development of the pulsed fusion concept developed at Helion Energy. All previous theoretical and simulation work on FRC merging and compression was performed using 2D MHD models. The results of novel 2D hybrid simulations (fluid electrons and full-orbit kinetic ions) of FRC merging and compression are presented. Results of kinetic and MHD simulations, computed using the HYM code, are compared and analyzed. In cases without axial magnetic compression, both the MHD and hybrid simulations show a high sensitivity to the initial parameters (i.e. FRC separation, velocity, normalized separatrix radius, and plasma viscosity), showing that FRCs with large elongation and separatrix radius either do not merge or merge partially, forming a doublet FRC. Application of a mirror coil field at the FRC ends with increasing strength is shown to lead to fast and complete merging of the FRCs in MHD and kinetic simulations.
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