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Title: Kinetic theory of passing energetic ion transport in presence of the resonant interactions with a rotating magnetic island

The enhanced transport of passing energetic ions (PEIs) in presence of the resonant interactions with a rotating magnetic island is investigated within the drift kinetic framework. When the island rotation plays a role in the resonant interaction, we find that the velocities of PEIs satisfy a constraint relation of resonant flux surface in phase space. The resonant flux surfaces overlap with the magnetic flux surfaces in real space. A new transport channel responsible for the PEIs moving across the magnetic flux surfaces, i.e., continuously overlapping, is found. Two kinds of radial motions can be induced by the surface overlapping: one arises from the coupling between the resonance and the collision with the background plasma and the other from not completely overlapping of the two surfaces. The two radial motions and the symmetry-breaking induced radial motion constitute the total radial motion. When the pitch-angle scattering rate is very weak, the surface-shear induced transport is dominant. Only a small increase in the collision rate can significantly influence the total transport.
Authors:
; ; ;  [1] ;  [2] ;  [3]
  1. School of Nuclear Science and Technology, University of South China, Hengyang 421001 (China)
  2. Southwestern Institute of Physics, P.O. Box 432, Chengdu 610041 (China)
  3. School of Mathematics and Physics, University of South China, Hengyang 421001 (China)
Publication Date:
OSTI Identifier:
22493811
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 23; Journal Issue: 1; Other Information: (c) 2016 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; CHARGED-PARTICLE TRANSPORT; COLLISIONS; INCLINATION; INTERACTIONS; LIMITING VALUES; MAGNETIC FLUX; MAGNETIC ISLANDS; MAGNETIC SURFACES; PHASE SPACE; PLASMA; RESONANCE; ROTATING PLASMA; SCATTERING; SHEAR; SYMMETRY BREAKING; TAIL IONS