journal article·2023-06-01Open access

Destabilizing effects of edge infernal components on resistive wall modes in advanced tokamak scenarios

Rui Han, Ping Zhu, Linjin Zheng

AIP Advances· Volume 13· Issue 6

Abstract

The stability of the n = 1 resistive wall modes (RWMs) dominated by the pressure-driven infernal components is investigated using the ideal magnetohydrodynamics (MHD) code AEGIS for the advanced tokamak scenarios. Here, n is the toroidal mode number. In the advanced tokamak scenarios, due to the large fraction of bootstrap current contribution, the profile of safety factor q is deeply reversed in magnetic shear in the central core region and locally flattened within the edge pedestal. Consequently, the pressure-driven infernal components develop in the corresponding flat-q regions of both core and edge. However, the edge infernal components dominate the n = 1 RWM structure and lead to lower βN limits for the advanced tokamak scenarios. In the framework of ideal MHD, the edge rotation is found the most critical to the stabilization due to the dominant influence of the edge infernal components, which should be maintained sufficiently large in magnitude and range in order for the rotation alone to fully suppress the n = 1 RWM in typical advanced tokamak scenarios.
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Research context

OpenAlex topics: Magnetic confinement fusion research · Ionosphere and magnetosphere dynamics · Superconducting Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Plasma Physics and Fusion Engineering, School of Nuclear Science and Technology, University of Science and Technology of China 1 , Hefei 230026, China

International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology 2 , Wuhan, Hubei 430074, China

Department of Engineering Physics, University of Wisconsin-Madison 3 , Madison, Wisconsin 53706, USA

Institute of Fusion Studies, University of Texas at Austin 4 , Austin, Texas 78712, USA

Funding

National Magnetic Confinement Fusion Program of China · National Natural Science Foundation of China · National Key Research and Development Program of China · Fundamental Research Funds for the Central Universities · U.S. Department of Energy

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