Comparison of plasma turbulence in the low- and high-field Scrape-Off Layers in the T-10 tokamak
Comparison of plasma turbulence in the low- and high-field Scrape-Off Layers in the T-10 tokamak
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T-10 托卡马克低场和高场刮除层中等离子体湍流的比较
DOI：
10.1088/0029-5515/45/6/007
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发表时间：
2005
期刊：
影响因子：
3.3
通讯作者：
D. V. Sarytchev
中科院分区：
文献类型：
--
作者：
G. Kirnev;V. Budaev;S. Grashin;L. Khimchenko;D. V. Sarytchev
对T-10托卡马克装置高密度区刮离层湍流和垂直反常粒子输运进行了实验研究。通过对托卡马克低场侧和高场侧测量的等离子体参数的比较发现，托卡马克内侧和外侧的湍流是不同的。湍流具有间歇性，但船内离子饱和电流的起伏程度约为LFS的两倍。在LFS处测得的径向湍流粒子通量和有效垂直扩散系数约为在HFS处观测到的3-5倍。在LFS处增强的垂直粒子通量是由在最后一个闭合通量表面附近形成的高密度等离子体结构定义的。高密度结构内部的极向电场在等离子体柱的内侧和外侧具有不同的方向。极向电场引起的径向电漂移在LFS和HFS处都指向真空室。这些实验支持这样一种假设，即溶胶平行流动可能是由另一种机制引起的，例如“气球”输送，它产生更大的粒子流量，从核心进入外部中面的溶胶。
Experimental investigation of the Scrape-Off Layer (SOL) turbulence and the perpendicular anomalous particle transport in the high density regime in the T-10 tokamak is presented. Comparison of the plasma parameters measured at the low-field side (LFS) and the high-field side (HFS) of the tokamak shows that the inboard turbulence essentially differs from the outboard one. Turbulence has an intermittent character but the fluctuation level of the inboard ion saturation current is about two times lower than at the LFS. The radial turbulent particle flux and the effective perpendicular diffusion coefficient measured at the LFS are about 3–5 times higher than those observed at the HFS. Enhanced perpendicular particle flux at the LFS is defined by the high density plasma structures formed in the vicinity of the last closed flux surface. The poloidal electric field inside the high density structures has different directions at the inboard and outboard sides of the plasma column. The radial electric drift induced by the poloidal electric field is directed towards the vacuum vessel at both the LFS and the HFS. These experiments support the hypothesis that SOL parallel flow might be caused by an additional mechanism such as ‘ballooning’ transport, which generates a larger flux of particles from the core into the SOL at the outer mid-plane.