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Theory and Simulation Study of Transport Processes in Magnetized Plasmas

磁化等离子体输运过程的理论与仿真研究

基本信息

批准号：
01580012
负责人：
NISHIKAWA Kyoji
金额：
$ 1.54万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

The purpose of the present research is to study the particle and energy transport of a magnetically confined plasma across the magnetic field over a macroscopic scale based on the particle kinetic theory. One useful method for this purpose is to use the particle simulation technique. To this end, the macroscale particle code which is applicable to study nonuniform and nonlinear plasma behaviors over a long time and large space scales has been developed. The development of the macroscale particle simulation code was started in 1984 and was completed in the fiscal year 1989 for the case of a plasma in nearly uniform density and magnetic field profile. In the fiscal year 1990, an improvement of this code was carried out with the aim to make it applicable to study of macroscopic and kinetic nonlinear phenomena in non-uniform high temperature plasmas. Namely, there are three requisits : 1) t he characteristic time scale be much larger than the electronic time scales (DELTAt>>omega_<CA>^<-1>, omega_<PA>^<-1>) ; 2) strong nonuniformity of the density and magnetic field be treated ; 3) arbitrary plasma shapes such as torus, noncirculer cross sections be treated. Of these, condition 1) was already satisfied, so the code was improved to satisfy condition 2) in 1990. Further improvement and applications to real systems are left to future work which will be conducted at the newly established National Institute for Fusion Science.As for the analytical work, a general expression for the particle drift flux across an arbitrary shape of magnetic field due to the ponderomotive force of high frequency electromagnetic fields was derived based on the single particle picture and was shown to be consistent with the flux based on the fluid picture. The nonambipolr flux which causes a radial electric field was derived.

本研究的目的是基于粒子动力学理论，在宏观尺度上研究磁场中磁约束等离子体的粒子输运和能量输运。一个有用的方法是使用粒子模拟技术。为此，开发了适用于研究长时间、大空间尺度非均匀非线性等离子体行为的宏观粒子程序。宏观尺度粒子模拟代码的开发始于1984年，并于1989财政年度完成，用于几乎均匀密度和磁场分布的等离子体的情况。在1990财政年度，该代码进行了改进，目的是使其适用于非均匀高温等离子体中的宏观和动力学非线性现象的研究。即有三个要求：1）特征时标远大于电子时标（DELTAt>> Ω<CA><-1>_（1/2），Ω_（1/<PA>2<-1>））; 2）处理强密度和磁场的非均匀性，3）处理任意形状的等离子体，如圆环、非圆截面等。其中，条件1）已经满足，因此在1990年改进了代码以满足条件2）。进一步的改进和对真实的系统的应用留待新成立的国家聚变科学研究所今后的工作来进行。基于单粒子图像，导出了高频电磁场有质动力作用下粒子在任意形状磁场中的漂移通量的一般表达式，并与基于磁通的在流动的画面上。导出了产生径向电场的非偶极磁通量。