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首页> 外文期刊>Nuclear fusion >Comparison of plasma turbulence in the low- and high-field Scrape-Off Layers in the T-10 tokamak
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Comparison of plasma turbulence in the low- and high-field Scrape-Off Layers in the T-10 tokamak

机译：T-10托卡马克低场和高场Scrape-Off层中等离子体湍流的比较

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摘要

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.
机译：提出了在T-10托卡马克高密度状态下刮擦层（SOL）湍流和垂直异常颗粒传输的实验研究。比较在托卡马克的低场侧（LFS）和高场侧（HFS）测得的等离子体参数表明，内侧湍流与外侧湍流本质上是不同的。湍流具有间歇性，但内侧离子饱和电流的波动水平大约比LFS低两倍。在LFS处测得的径向湍流粒子通量和有效垂直扩散系数比在HFS处观测到的高约3-5倍。在LFS处增强的垂直粒子通量由在最后一个封闭通量表面附近形成的高密度等离子体结构定义。高密度结构内部的极向电场在等离子柱的内侧和外侧具有不同的方向。由极向电场引起的径向电漂移在LFS和HFS处都指向真空容器。这些实验支持以下假设：SOL平行流可能由其他机制（例如“气球状”运输）引起，该机制在外部中平面处从核芯产生更大的粒子通量到SOL。

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