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Title: Nonlinear magnetohydrodynamics of edge localized mode precursors

A possible origin of edge-localized-mode (ELM) precursors based on nonlinear ideal peeling-ballooning mode is reported. Via nonlinear variational principle, a nonlinear evolution equation of the radial displacement is derived and solved, analytically. Besides an explosive growth in the initial nonlinear phase, it is found that the local displacement evolves into an oscillating state in the developed nonlinear phase. The nonlinear frequency of the ELM precursors scales as ω{sub pre}∼x{sup 1/3}ξ{sup ^}{sub ψ,in}{sup 2/3}n, with x position in radial direction, ξ{sup ^}{sub ψ,in} strength of initial perturbation, and n toroidal mode number.
Authors:
 [1] ;  [2] ;  [3] ;  [1]
  1. State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing (China)
  2. (Korea, Republic of)
  3. SEEE, Huazhong University of Science and Technology, Wuhan, Hubei 430074 (China)
Publication Date:
OSTI Identifier:
22408110
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 2; 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; BALLOONING INSTABILITY; DISTURBANCES; EDGE LOCALIZED MODES; MAGNETOHYDRODYNAMICS; MATHEMATICAL EVOLUTION; NONLINEAR PROBLEMS; PRECURSOR; VARIATIONAL METHODS