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Title: Shear-flow trapped-ion-mode interaction revisited. I. Influence of low-frequency zonal flow on ion-temperature-gradient driven turbulence

Collisionless trapped ion modes (CTIMs) turbulence exhibits a rich variety of zonal flow physics. The coupling of CTIMs with shear flow driven by the Kelvin-Helmholtz (KH) instability has been investigated. The work explores the parametric excitation of zonal flow modified by wave-particle interactions leading to a new type of resonant low-frequency zonal flow. The KH-CTIM interaction on zonal flow growth and its feedback on turbulence is investigated using semi-Lagrangian gyrokinetic Vlasov simulations based on a Hamiltonian reduction technique, where both fast scales (cyclotron plus bounce motions) are gyro-averaged.
Authors:
 [1] ;  [2]
  1. Institut Jean Lamour—UMR 7168, University of Lorraine, BP 239, F-54506 Vandoeuvre les Nancy, Lorraine (France)
  2. LFMA—Ecole Centrale de Lyon, Université de Lyon, 60134 Ecully (France)
Publication Date:
OSTI Identifier:
22490044
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 8; 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; BOLTZMANN-VLASOV EQUATION; COLLISIONLESS PLASMA; HAMILTONIANS; HELMHOLTZ INSTABILITY; ION TEMPERATURE; IONS; LAGRANGIAN FUNCTION; PARTICLE INTERACTIONS; SHEAR; TEMPERATURE GRADIENTS; TRAPPING; TURBULENCE