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Title: Energy and frequency dependence of the alpha particle redistribution produced by internal kink modes

The redistribution of alpha particles due to internal kink modes is studied. The exact particle trajectories in the total fields, equilibrium plus perturbation, are calculated. The equilibrium has circular cross section and the plasma parameters are similar to those expected in ITER. The alpha particles are initially distributed according to a slowing down distribution function and have energies between 18 keV and 3.5 MeV. The (1, 1), (2, 2), and (2, 1) modes are included and the effect of changing their amplitude and frequency is studied. When only the (1, 1) mode is included, the spreading of high energy (E≳1 MeV) alpha particles increases slowly with the energy and mode frequency. At lower energies, the redistribution is more sensitive to the mode frequency and particle energy. When a (2, 1) mode is added, the spreading increases significantly and particles can reach the edge of the plasma. Trapped particles are the most affected and the redistribution parameter can have maxima above 1 MeV, depending on the mode frequency. These results can have important implications for ash removal.
Authors:
 [1] ;  [1] ;  [2] ;  [3] ; ;  [4] ;  [5]
  1. Comisión Nacional de Energía Atómica, Centro Atómico Bariloche e Instituto Balseiro, 8400 Bariloche, RN (Argentina)
  2. (Argentina)
  3. CONICET, 8400 Bariloche, RN (Argentina)
  4. Laboratoire de Physique des Plasmas, CNRS, Ecole Polytechnique, 91128, Palaiseau cedex (France)
  5. Laboratoire d'Optique Appliquee, ENSTA, CNRS, Ecole Polytechnique, 91761 Palaiseau cedex (France)
Publication Date:
OSTI Identifier:
22304445
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 8; Other Information: (c) 2014 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; ALPHA PARTICLES; AMPLITUDES; CROSS SECTIONS; DISTRIBUTION FUNCTIONS; FREQUENCY DEPENDENCE; ITER TOKAMAK; KEV RANGE 10-100; MEV RANGE 01-10; PERTURBATION THEORY; PLASMA; SLOWING-DOWN