Free boundary 3D ideal MHD equilibrium calculations for non-linearly saturated current driven external kink modes in tokamaks

Nuclear Fushion

article

A. Kleiner¹  J.P. Graves¹  W.A. Cooper¹  T. Nicolas²  C. Wahlberg³ 

[1] Ecole Polytechnique Fédérale de Lausanne ,(EPFL), Swiss Plasma Center;Centre de Physique Théorique;Department of Physics and Astronomy, PO Box 516, Uppsala University

关键词: magnetohydrodynamics;    tokamak;    external kink;    free boundary;    3D equilibrium;    nonlinear;   

DOI  :  10.1088/1741-4326/aac607

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

It is shown that free boundary 3D equilibrium calculations in tokamak geometry are capable of capturing the physics of non-linearly saturated external kink modes for monotonic current andqprofiles typical of standard (baseline) plasma scenarios. The VMEC ideal MHD equilibrium model exhibits strong flux surface corrugations of the plasma vacuum boundary, driven by the core current profile. A method is presented which conveniently extracts the amplitude of the corrugation in terms of Fourier components in straight field line coordinates. The Fourier spectrum, and condition for non-linear corrugation agrees well with linear simulations, and the saturated amplitude agrees well with non-linear analytic calculations.

【 授权许可】

Unknown