Comparison of confinement physiscs for toroidal plasmas

1.虚拟现实显示系统是利用计算机模拟来理解聚变等离子体中复杂现象的一种先进可视化手段。特别是开发了显示系统与人的交互界面，实现了在虚拟现实空间中以交互方式方便、高效地分析计算结果的方法。2.在实际实验观测的基础上，从初始状态出发，对球形托卡马克动力学进行了三维非线性MHD模拟，得到了整体弛豫现象的发生。在压力崩溃过程后，环面返回到接近轴对称初始构型的状态，但具有更宽的压力分布。3.对三维平衡代码提示进行了修改，扩展了函数，该提示不假定存在嵌套磁性面。4.开发了一个新的螺旋等离子体全三维几何结构的MHD模拟程序，并将其应用于LHD位形中不稳定模的非线性增长。观察到了由压力驱动不稳定性驱动的松弛现象，这种松弛现象并不是破坏性的，但导致了向新的平衡的转变。5.建立了描述反常输运现象的基本动力学模型。指出了前人在建模过程中对奇异性的错误数学处理，并提出了一种新的建模方法。6.开展了螺旋等离子体实验，研究了外围等离子体的起伏和约束条件的改善。发现了颗粒通量由外向内的反转。

1. Virtual reality display system was developed as an advanced visualization method to understand complex phenomena in fusion plasmas by using computer simulation. In particular, interfaces between the display system and human beings have been developed, and we have realized a method to analyze conveniently and efficiently computation results in interactive way in the virtual reality space. 2. Three dimensional nonlinear MHD simulation on spherical tokamak dynamics was executed to obtain occurrence of global relaxation phenomena, starting from an initial state based on an actual experimental observation. After a process of pressure collapse, the torus returns to a state close to the axisymmetric initial configuration but with a broader pressure profile. 3. The three dimensional equilibrium code HINT, which does not assume the existence of nested magnetic surfaces, was modified to extend functions. 4. A new MHD simulation code for a full three dimensional geometry of helical plasmas were developed and applied for nonlinear growth of unstable modes in the LHD configuration. A relaxation phenomenon driven by pressure driven instabilities was observed, which was not destructive but caused transition to a new equilibrium. 5. A modeling was made to describe basic dynamics of the anomalous transport phenomena. Incorrect mathematical treatment of singularity in previous modeling by other authors was indicated and a new modeling was proposed. 6. Experiments of helical plasmas were executed to study fluctuations in periphery plasmas and improvement of confinement. A reversal of particle flux from outward to inward was found.