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A Dynamic-Characteristics Study of Mono-pole Drift Vortices in a Magnetized Plasma with Inhomogeneous Density

不均匀密度磁化等离子体中单极漂移涡的动态特性研究

基本信息

批准号：
12680478
负责人：
SAEKI Koichi
金额：
$ 2.62万
依托单位：
Shizuoka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

1) At first, we show the Hasegawa-Mima equation describing drift waves and drift-wave vortices and point out the analogy between drift waves and Rossby waves and the analogy between drift-wave vortices and Rossby-wave vortices. The theory of dipole drift-wave vortices and the computer-simulation results of mono-pole drift-wave vortices based on the Hasegawa-Mima equation are also described. On the base of these theoretical backgrounds, we tried to make an experiment of theoretically expected mono-pole drift-wave vortices.2) Experimentally, we determined the dispersion relation of drift waves propagating perpen dicularilly to the density gradient and the magnetic field, and observed mono-pole drift-wave vortices for the first time. The observed mono-pole drift-wave vortices propagate with velocities of the drift-wave speed, being accompanied by the backward emission of short-w avelength wakes. Moreover, we detected their drift in the direction of density gradient in case of positive density perturbations, as observed in the computer simulation. In case of strong vortices, however, their behaviors are complicate and are difficult for us to fin d the physical mechanism.3) We have found mono-pole drift-wave vortices for the first time, and clarified their characteristics. Drift waves and drift-wave vortices are specially important physical phenome na to control the confinement of fusion oriented plasmas. It is necessary to clarify the physics of drift waves and drift-wave vortices. Thus, still, we shall make efforts to get experimental data getting their physics clear.

1)首先，我们给出了描述漂移波和漂移波涡的Hasegawa-Mima方程，指出了漂移波和Rossby波以及漂移波涡和Rossby波涡的相似性。文中还介绍了偶极漂移波涡的理论和基于Hasegawa-Mima方程的单极漂移波涡的计算机模拟结果。在这些理论背景的基础上，我们尝试进行了理论上预期的单极漂移波涡旋的实验。2）在实验上，我们确定了垂直于密度梯度和磁场传播的漂移波的色散关系，并首次观测到了单极漂移波涡旋。所观察到的单极漂移波涡的漂移波速度的速度传播，伴随着短波长尾流的向后发射。此外，我们检测到它们的漂移的密度梯度方向的情况下，正的密度扰动，在计算机模拟中观察到的。但在强涡旋情况下，其行为较为复杂，难以揭示其物理机制。3）首次发现了单极漂移波涡旋，并阐明了其特征。漂移波和漂移波涡旋是控制聚变等离子体约束的重要物理现象。有必要澄清漂移波和漂移波涡旋的物理性质。因此，我们仍然要努力获得实验数据，使它们的物理性质清楚。