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Investigation of annular/central collapse events triggered by the double tearing modes in EAST
Nuclear Fusion ( IF 3.3 ) Pub Date : 2021-09-03 , DOI: 10.1088/1741-4326/ac1dc4
Ming Xu , Liqun Hu , Tianfu Zhou , Ling Zhang , Liqing Xu , Yanmin Duan , Qing Zang , Haiqing Liu , Xianzu Gong , Guosheng Xu , the EAST Team

Annular/central collapses of electron temperature have been investigated in the EAST tokamak. The precursor modes are excited before the annular/central collapse events, and the coexistence of multi magnetic island chains can be observed synchronously for the core concentration of high-Z impurities. The primary magnetic islands for the two cases are located in the same region of 0.25 ⩽ ρ(r/a) ⩽ 0.35, while the secondary magnetic islands for central and annular cases are located inside (ρ ≈ 0.1) and outside (ρ ≈ 0.4) respectively. The similar simulation has been performed by the toroidal resistive MHD code CLT (Zhang etal 2020 Phys. Plasmas 27 122509), and the annular/central collapse events can be reproduced by the magnetic reconnection of m/n = 2/1 double tearing modes, m and n are the poloidal and toroidal mode numbers respectively. The combination of lower hybrid current driven and off-axis electron cyclotron resonance heating is an essential condition for the establishment of reversed magnetic shear. The different penetration depth of high-Z impurity density plays an important role for excitation of the annular/central collapse events, e.g. the steeper gradient of T e-profile can be formed accordingly in the annular region of 0.1 ⩽ ρ ⩽ 0.4, together with excitation of the precursor modes.



中文翻译:

EAST双撕裂模式引发的环形/中央坍塌事件的研究

已经在东托卡马克中研究了电子温度的环形/中心坍缩。前驱模式在环形/中心坍塌事件之前被激发,对于高Z杂质的核心浓度,可以同时观察到多磁岛链的共存。两种情况的初级磁岛位于 0.25 ⩽ ρ ( r / a ) ⩽ 0.35的同一区域,而中心和环形情况的次级磁岛位于内部 ( ρ ≈ 0.1) 和外部 ( ρ ≈ 0.4 ) 分别。类似的模拟已经由环形电阻 MHD 代码 CLT (Zhang et 2020 Phys. Plasmas 27 122509),并且环形/中央坍塌事件可以通过m / n = 2/1双撕裂模式的磁重联再现,mn分别是极向和环形模数。较低混合电流驱动和离轴电子回旋共振加热的结合是建立反向磁剪切的必要条件。高的不同穿透深度Ž杂质密度效力于环形/中央崩溃事件激发了重要的作用,例如越陡梯度Ť Ë -profile可以在0.1⩽的环形区域形成相应ρ ⩽ 0.4,连同前驱模式的激发。

更新日期:2021-09-03
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