Edge Plasma. Physics

边缘等离子体。

基本信息

批准号：
11210206
负责人：
TAKAMURA Shuichi
金额：
$ 8.06万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research on Priority Areas
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2004
项目状态：
已结题

项目摘要

# Detached plasma with electron-ion recombinationIncomplete thermalization of singlet and triplet high n-levels results in a different response to diffusion processes under edge plasma conditions, especially for detached plasma with electron-ion recombination. The collisional-radiative numerical code SOPHIA shows that intercombination transitions and radiation transport effects are extremely important to describe the line emission whereas inequilibrium plasmas, these transitions give only little corrections. We have shown that the intensity of transitions originating from the singlet and triplet system strongly depends on diffusion.# Fluctuation propertyin attached and detached plasmas and related non-local transport phenomena We have investigated the velocity distribution of the intermittent bursty fluctuations in the ion saturation currents observed in the linear divertor plasma simulator, NAGDIS-II. The intermittent bursty signals were analyzed by the wavelet transform with complex … More Morlet mother wavelet. Analyzing a lot of bursts in the ion saturation currents based on the wavelet cross-correlation gives the velocity distribution function. It is positively skewed at the peripheral region of the plasma column, which means the intermittent bursts mainly propagate toward the wall. The averaged velocity depends on the neutral pressure associated with the transition between the attached and detached plasmas.# Influence of dynamic ergodic divertor on fluctuation and transport properties in tokamak plasmasWe have conducted the experiment to investigate microscopic plasma response to rotating helical magnetic filed by using an electrostatic probe with multi pins. Correlation between time evolution of ion saturation currents measured with each probe was analyzed by wavelet analysis, which has strong advantage for analyzing time evolution data with intermittent events. At wavelet-scale corresponding to the driving frequency of DED (dynamic ergodic divertor), intermittent turbulence of plasma density was observed. It is also found that the turbulence structure propagates in the same direction of rotation of helical magnetic filed. This phenomena could be related to chaos control. Less

# 具有电子-离子复合的分离等离子体单线态和三线态高 n 能级的不完全热化导致边缘等离子体条件下对扩散过程的不同响应，特别是对于具有电子-离子复合的分离等离子体碰撞辐射数字代码 SOPHIA 显示相互结合。跃迁和辐射传输效应对于描述线发射极其重要，而对于不平衡等离子体，这些跃迁仅给出很少的校正，我们已经表明，源自单线态和的跃迁的强度。三线态系统强烈依赖于扩散。# 附着和分离等离子体的波动特性以及相关的非局域传输现象我们研究了在线性偏滤器等离子体模拟器 NAGDIS-II 中观察到的离子饱和电流的间歇突发波动的速度分布。通过使用复母小波的小波变换对突发信号进行了分析。基于小波互相关分析了离子饱和电流中的大量突发信号。速度分布函数在等离子体柱的外围区域呈正偏斜，这意味着间歇性爆发主要向壁传播。平均速度取决于与附着和分离等离子体之间的过渡相关的中性压力。动态遍历偏滤器对托卡马克等离子体波动和传输特性的影响我们进行了实验，通过使用多针静电探针研究微观等离子体对旋转螺旋磁场的响应之间的时间演化之间的相关性。通过小波分析对每个探针测量的离子饱和电流进行分析，这对于分析间歇事件的时间演化数据具有很强的优势，在与 DED（动态遍历偏滤器）驱动频率相对应的小波尺度上，观察到等离子体密度的间歇性湍流。还发现湍流结构沿螺旋磁场的相同旋转方向传播，这种现象可能与混沌控制有关。