论文标题
高碰撞性融合等离子体的湍流中长距离相关的观察
Observation of Long-Radial-Range-Correlation in Turbulence in High-Collisionality High-Confinement Fusion Plasmas
论文作者
论文摘要
我们报告了在DIII-D TOKAMAK上高碰撞H模式等离子体核心的空间不对称湍流结构的观察。这些湍流结构从较短的波长湍流中发展出来，并具有径向伸长的结构。湍流的信封在中拉迪乌斯地区跨越了宽阔的径向范围，从而导致了流媒体般的运输事件。潜在的湍流以间歇性，长期记忆效应和自组织关键性的特征频谱为特征。当平均流量的剪切速率低于湍流散射速率时，幅度和径向尺度大大增加。增强的LRRC传输事件伴随着归一化能量限制时间的明显降解。这些发现构成了高碰撞h模式等离子体中长期范围湍流事件的首次实验观察，并证明了平均剪切流在具有长大范围相关性的湍流形成和传播中的作用。
We report on the observation of spatially asymmetric turbulent structures with a long radial correlation length in the core of high-collisionality H-mode plasmas on DIII-D tokamak. These turbulent structures develop from shorter wavelength turbulence and have a radially elongated structure. The envelope of turbulence spans a broad radial range in the mid-radius region, leading to streamer-like transport events. The underlying turbulence is featured by intermittency, long-term memory effect, and the characteristic spectrum of self-organized criticality. The amplitude and the radial scale increase substantially when the shearing rate of the mean flow is reduced below the turbulent scattering rate. The enhanced LRRC transport events are accompanied by apparent degradation of normalized energy confinement time. These findings constitute the first experimental observation of long-radial-range turbulent transport events in high-collisionality H-mode plasmas, and demonstrate the role of mean shear flows in the formation and propagation of turbulence with long-radial-range correlation.
