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Edge turbulence approaching the density limit in RFX-mod experiment

机译:RFX-MOD实验中的密度限制接近边缘湍流

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The boundary region of the RFX-mod reversed field pinch experiment is strongly influenced by the value of the electron density. With increasing density the magnetic topology in the plasma core and in the plasma edge changes, together with the statistical properties of the edge turbulent fluctuations. Using the density normalized to the Greenwald density (n/n(G)), two density regimes are identified: the low density regime at n/n(G);<;0.3?0.4, and the high density regime for n/n(G);>;0.4?0.5, without a clear threshold between them. At low density the plasma is dominated by the (m, n);=;(1, ?7) magnetic mode, which gives the same shape to the magnetic boundary; at higher density a strong (0, 1) mode rises. When increasing n/n(G), edge fluctuations develop strong non-Gaussian tails, turbulent structures become larger and their radial velocity become measurable with the gas puff imaging diagnostic when n/n(G);>;0.3?0.4. This phenomenology is described in detail for the two density regimes of RFX-mod.
机译:RFX-MOD反转场捏合实验的边界区域受电子密度的值强烈影响。随着密度的增加,等离子体芯中的磁拓扑和等离子体边缘改变,以及边缘湍流波动的统计特性。使用归一化的密度为绿瓦密度(n / n(g)),鉴定了两个密度制度:n / n(g)的低密度方案; <; 0.3?0.4,以及n / n的高密度制度(g);>; 0.4?0.5,它们之间没有明确的阈值。在低密度下,等离子体由(m,n)支配; =;(1,α7)磁力模式,其给出磁边的形状相同;在较高密度下,强(0,1)模式升高。当增加n / n(g)时,边缘波动显影强大的非高斯尾部,湍流结构变大,并且当n / n(g)时的气体粉扑成像诊断,它们的径向速度变得可测量。0.3?0.4。对于RFX-MOD的两个密度方案,详细描述了这种现象学。

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