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Comparison of confinement physiscs for toroidal plasmas

环形等离子体的约束物理比较

基本信息

批准号：
11695035
负责人：
HAYASHI Takaya
金额：
$ 2.94万
依托单位：
Natiomal Institute for Fusion Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11695035/
关键词：
toroidal plasma plasma confinement virtual reality helical plasma plasma diagnostic plasma heating plasma stability comquter simulation

项目摘要

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.

1.虚拟现实显示系统是一种先进的可视化方法，通过计算机模拟来理解聚变等离子体中的复杂现象。特别是，显示系统和人类之间的接口已经开发，我们已经实现了一种方法，以方便和有效地分析计算结果的交互方式在虚拟现实空间。2.对球形托卡马克动力学进行了三维非线性磁流体动力学模拟，从一个实际的实验观测出发，从初始状态出发，得到了整体弛豫现象的发生。在压力崩溃过程之后，环面返回到接近于轴对称初始构型的状态，但具有更宽的压力分布。3.本文对三维平衡程序HINT进行了修改，使其功能得到扩展，该程序没有假设嵌套磁面的存在。4.发展了一个新的三维螺旋等离子体MHD模拟程序，并应用于LHD位形中不稳定模的非线性增长。观察到由压力驱动的不稳定性驱动的弛豫现象，这不是破坏性的，而是引起向新平衡的转变。5.建立了描述异常输运现象基本动力学的模型。指出了前人建模中对奇异性的错误数学处理，提出了一种新的建模方法。6.为了研究螺旋等离子体中等离子体边缘的涨落和约束的改善，进行了螺旋等离子体实验。发现粒子通量从外向内的逆转。