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Overview of ELM Control by Low n Magnetic Perturbations on JET

机译：JET上低n磁扰动的ELM控制概述

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A series of ELM control experiments have been performed on JET aiming at a better understanding of the plasma response to applied magnetic perturbations. The dynamics of the edge profiles with applied n = 1 fields have been studied in the type-I ELM H-mode plasmas. Typically, the pedestal density decreased by about 20 % when the n = 1 perturbation field was applied (So called pump-out effect). However, there is no influence of the n = 1 fields on the recovery rate of the pedestal pressure, but the ELM crash occurs earlier and at a lower level of the pedestal pressure and pressure gradient. The compensation of the density pump-out has been demonstrated using either gas fuelling or pellets injection in low triangularity H-mode plasmas. Strong toroidal rotation braking by more than 60 % has been observed, and found to be independent on the safety factor. The calculated Neoclassical Toroidal Viscosity (NTV) torque profile in the ν regime including the boundary effect is in agreement with the observed torque profile induced by the n = 1 fields on JET. No complete ELM suppression was observed by application of either n = 1 or n = 2 fields with a Chirikov parameter above one at √ Ψ ≥ 0.925, which is one of the important criteria for the design of ITER ELM control coils.
机译：在JET上进行了一系列ELM控制实验，旨在更好地理解等离子体对施加的磁扰动的响应。在I型ELM H型等离子体中研究了施加n = 1场的边缘轮廓的动力学。通常，当施加n = 1扰动场时，基座密度降低约20％（所谓的泵出效应）。但是，n = 1场对基座压力的恢复速率没有影响，但是ELM崩溃发生的时间更早，且基座压力和压力梯度的水平较低。使用低三角形H模式等离子体中的气体燃料或颗粒注入已经证明了密度抽出的补偿。已观察到超过60％的强力环形旋转制动，并且与安全系数无关。在包括边界效应在内的ν态中计算出的新古典环形粘度（NTV）扭矩曲线与JET上n = 1场引起的观察到的扭矩曲线一致。在√≥≥0.925时，通过施加Chirikov参数大于1的n = 1或n = 2磁场，未观察到完全ELM抑制，这是ITER ELM控制线圈设计的重要标准之一。

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