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Simulation Study of Spontaneous Flow Formation in toroidal Plasma System with Open Field Region

开放场环形等离子体系统中自发流形成的模拟研究

基本信息

批准号：
17560738
负责人：
TAKIZUKA Tomonori
金额：
$ 1.73万
依托单位：
Japan Atomic Energy Agency
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17560738/
关键词：
Advanced Particle Simulation Comprehensive Fluid Simulation SOL Divertor Plasmas Tokamak Plasma Spontaneous Flow Radial Electric Field

项目摘要

Confinement properties of magnetic fusion plasmas are affected much by the plasma flow. Heat and particle control is dependent on the plasma flow in SOL region. The formation mechanism of the flow in toroidal plasmas, however, has not well understood so far. The present aim is to research the plasma flow in toroidal plasmas with open-field region such as SOL/diveror. The formation mechanism and control method of the flow are investigated with the particle simulation.We improved a two-dimensional advanced particle code PARASOL for the straight tokamak system developed beforehand to a 2D toroidal PARASOL, which becomes the code available for global simulations of divertor tokamaks. We equipped-physics models in PARASOL ; the abrupt source model of hotter temperature plasma at an ELM crash for the study of the transient plasma flow and the neutral beam injection source model for the direct control of the flow. We have been improving a comprehensive divertor fluid code SONIC and an integrated tokamak transport code TOPICS-IB. We studied the mutual dependence between impurity transport and plasma flow, and the effect of SOL plasma flow on the ELM energy loss.By using 1D PARASOL, we investigated the transient response of SOL/divertor plasmas against the asymmetric ELM, and clarified structures of asymmetric heat flow and plasma flow in the open-field region. Using 2D PARASOL, we found the transition of radial electric field from positive to negative in the closed field region with the increase of Larmor radius. We studied further, using toroidal 2D PARASOL, the effect of banana width of trapped ions on the formation of radial electric field and spontaneous flow.Present achievements are expected useful for the physics understanding of transport/confinement of fusion toroidal plasmas, and for the development of control methods of improved confinement and heat/particle handling.

磁聚变等离子体的约束特性受等离子体流动的影响很大。热和粒子控制取决于SOL区的等离子体流动。然而，环形等离子体中流动的形成机制至今还没有得到很好的理解。本文的目的是研究具有开场区的环形等离子体中的等离子体流动。本文用粒子模拟方法研究了偏滤器托卡马克系统中流动的形成机理和控制方法，并将已开发的直型托卡马克系统的二维先进粒子程序PARASOL改进为二维环形粒子程序PARASOL，使之成为偏滤器托卡马克系统全局模拟的通用程序。我们在PARASOL中装备了物理模型; ELM碰撞时较热温度等离子体的突变源模型用于研究瞬态等离子体流和中性束注入源模型用于直接控制流。我们一直在改进偏滤器流体综合程序SONIC和托卡马克输运程序TOPICS-IB。研究了杂质输运与等离子体流之间的相互依赖关系，以及SOL等离子体流对ELM能量损失的影响，利用一维PARASOL研究了SOL/偏滤器等离子体对非对称ELM的瞬态响应，阐明了非对称热流和等离子体流在外场区的结构。利用2DPARASOL，我们发现随着Larmor半径的增加，在封闭场区域，径向电场由正向负转变。利用环形2DPARASOL进一步研究了囚禁离子香蕉宽度对径向电场和自发流形成的影响，这些研究结果对于理解聚变环形等离子体的输运/约束的物理过程，以及改进约束和热/粒子处理的控制方法的发展是有用的。