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Investigation on the relation between edge radial electric field asymmetries in RFX-mod and density limit

机译：RFX-mod中边缘径向电场不对称与密度极限之间关系的研究

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摘要

In all major confinement devices (tokamaks, stellarators, spheromaks and reversed-field pinches-RFPs), a density limit has been found. Results summarized in a recent work by Puiatti et al (2009 Nucl. Fusion 49 045012) show that in the RFP high density does not cause a disruption, but a sequence of increasingly critical phenomena. First, at intermediate density there is the disappearance of the high-confinement quasisingle helicity/single helical axis regimes. Then, at densities close to the Greenwald limit, toroidally and radially localized density accumulation and radiation condensation are observed, together with a fast resistive decay of the plasma current, which constitutes the real operative limit of the device. In this paper we discuss the effect of the magnetic ripple on test particle motion, showing that the accumulation of electrons in the X-points of the edge m = 0 islands is responsible for a modulation of the radial electric field E_r which is at the core of the density limit mechanism. These results can be also relevant for the explanation of X-point multifaceted asymmetric radiation from the edge formation, observed in L-mode density limit discharges of JET.
机译：在所有主要的隔离设备（托卡马克，恒星，球状和反向场收缩-RFP）中，都发现了密度极限。 Puiatti等人（2009 Nucl。Fusion 49 045012）最近的工作总结的结果表明，在RFP中，高密度不会引起破坏，而是一系列日益严重的现象。首先，在中等密度下，高约束准四螺旋/单螺旋轴状态消失了。然后，在接近格林瓦尔德极限的密度下，观察到环形和径向局部密度累积和辐射凝结，以及等离子体电流的快速电阻衰减，这构成了设备的实际工作极限。在本文中，我们讨论了磁波纹对测试粒子运动的影响，表明在边缘m = 0岛的X点上电子的积累是对核心处径向电场E_r的调制的原因密度限制机制。这些结果也可能与解释在JET的L模式密度极限放电中观察到的来自边缘形成的X点多面不对称辐射有关。

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