skip to main content

Title: Bifurcation of resistive wall mode dynamics predicted by magnetohydrodynamic-kinetic hybrid theory

The magnetohydrodynamic-kinetic hybrid theory has been extensively and successfully applied for interpreting experimental observations of macroscopic, low frequency instabilities, such as the resistive wall mode, in fusion plasmas. In this work, it is discovered that an analytic version of the hybrid formulation predicts a bifurcation of the mode dynamics while varying certain physical parameters of the plasma, such as the thermal particle collisionality or the ratio of the thermal ion to electron temperatures. This bifurcation can robustly occur under reasonably large parameter spaces as well as with different assumptions, for instance, on the particle collision model. Qualitatively similar bifurcation features are also observed in full toroidal computations presented in this work, based on a non-perturbative hybrid formulation.
Authors:
;  [1] ; ; ; ;  [2] ;  [3] ;  [4]
  1. Key Laboratory of Materials Modification by Beams of the Ministry of Education, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China)
  2. Southwestern Institute of Physics, P.O.Box 432, Chengdu 610041 (China)
  3. Culham Centre for Fusion Energy, Culham Science Centre, Abingdon OX14 3DB (United Kingdom)
  4. (China)
Publication Date:
OSTI Identifier:
22490118
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BIFURCATION; CALCULATION METHODS; COLLISIONS; ELECTRON TEMPERATURE; MAGNETOHYDRODYNAMICS; MATHEMATICAL SPACE; PARTICLES; PLASMA; PLASMA INSTABILITY; WALLS