An approach to describe the plasma parameter variation with the effective minor radius across the edge region in the heliotron Large Helical Device (LHD) in configurations without and with a resonant magnetic perturbation (RMP) is elaborated, by averaging fluid equations for transport of particles, momentum and heat over the flux surfaces. Numerical solutions of one-dimensional, time-dependent equations derived and analytical estimates performed allow us to interpret the LHD experiments on the density limit. Calculations reproduce qualitatively the principal difference between situations without and in the presence of RMP: in the former case a thermal collapse of the discharge occurs immediately after the plasma detachment from the divertor target plates at a radiation level of 0.4–0.5; in the latter the radiating layer is localized at the plasma edge even if the power radiated exceeds 90% of the input power. A prominent role for such a behavior of plasma particle flows along ma...

中文翻译：

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大型螺旋装置中共振磁扰动对分离的影响建模

通过平均用于传输粒子的流体方程，阐述了一种描述在不带和带有共振磁扰动（RMP）的配置下，通过在日光加速器大螺旋装置（LHD）的边缘区域上的有效较小半径来描述等离子体参数变化的方法，通量表面上的动量和热量。一维，随时间变化的方程的数值解以及得到的分析估计值使我们能够解释密度极限上的左倾角实验。计算结果从质上再现了有无制冷剂和有制冷剂的情况之间的主要区别：在前一种情况下，等离子体在辐射水平为0.4-0.5时从扩散器靶板上脱离后立即发生放电的热塌陷；在后者中，即使辐射功率超过输入功率的90％，辐射层也位于等离子体边缘。等离子体颗粒沿着主流动方向的这种行为起着重要作用。