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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在边缘等离子体条件下，单态和三重态高n能级的不完全热化导致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-辐射数值模拟程序SOPHIA表明，相互结合跃迁和辐射输运效应对于描述谱线发射是非常重要的，而非平衡等离子体，这些跃迁只给出很小的修正。我们研究了在NAGDIS-II线性偏滤器等离子体模拟器中观察到的离子饱和电流中间歇性猝发起伏的速度分布。利用复数…小波变换对间歇性突发信号进行分析更多的莫雷特母小波。利用小波互相关分析了离子饱和电流中的大量突发性，给出了速度分布函数。它在等离子体柱的外围区域是正偏斜的，这意味着间歇性爆发主要向壁面传播。平均速度取决于与附着和分离的等离子体之间的跃迁有关的中性压力。动态遍历偏滤器对托卡马克等离子体中涨落和输运性质的影响我们用多针静电探头研究了旋转螺旋磁场对等离子体微观响应的实验。用小波分析方法分析了各探头测得的离子饱和电流随时间演化的相关性，对于分析具有间歇性事件的时间演化数据具有很强的优势。在对应于动态遍历偏滤器(DED)驱动频率的小波尺度上，观察到等离子体密度的间歇性湍流。研究还发现，湍流结构沿螺旋磁场的旋转方向传播。这种现象可能与混沌控制有关。较少