The role of edge current density on kink mode stability and its implication for magnetohydrodynamic activity associated with edge localized modes
The role of edge current density on kink mode stability and its implication for magnetohydrodynamic activity associated with edge localized modes
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DOI：
10.1063/1.860042
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发表时间：
1992-07
期刊：
影响因子：
--
通讯作者：
J. Manickam
中科院分区：
文献类型：
--
作者：
J. Manickam
等离子体平衡对外部扭结模式的稳定性取决于等离子体边缘附近的电流密度的细节以及边缘处的安全系数 q 的值。研究表明，等离子体边缘附近电流密度的增加会降低安全系数曲线中的剪切力，并导致扭结模式不稳定。高约束操作模式下的托卡马克等离子体在边缘附近具有高电流密度，并且已知表现出被称为边缘局域模式的活动。这种活动的一个重要特征是等离子体边缘附近磁流体动力学 (MHD) 活动的间歇性爆发。根据外部扭结模式，提出了 MHD 活动的模型。讨论了等离子体几何形状和平衡分布的作用。
The stability of a plasma equilibrium to the external kink mode is shown to be dependent on the details of the current density near the plasma edge and the value of the safety factor, q, at the edge. The buildup of the current density near the plasma edge is shown to decrease the shear in the safety‐factor profile and lead to destabilization of the kink mode. Tokamak plasmas in the high confinement mode of operation have high current density near the edge and are known to exhibit activity referred to as edge localized modes. An important feature of this activity is intermittent bursts of magnetohydrodynamic (MHD) activity near the plasma edge. A model is proposed for the MHD activity in terms of the external kink mode. The role of the plasma geometry and equilibrium profiles is discussed.