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Resonant excitation of shear Alfvén perturbations by trapped energetic ions in a tokamak

Phys. Plasmas 16, 102506 (2009); doi:10.1063/1.3237026

Published 30 October 2009

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I. G. Abel,1,2 B. N. Breizman,3 S. E. Sharapov,2 and JET-EFDA Contributors
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB, United Kingdom
1Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford OX1 3NP, United Kingdom
2Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon OX14 3DB, United Kingdom
3Institute for Fusion Studies, The University of Texas, Austin, Texas 78712, USA
A new analytic expression is derived for the resonant drive of high n Alfvénic modes by particles accelerated to high energy by ion cyclotron resonance heating. This derivation includes finite orbit effects, and the formalism is completely nonperturbative. The high-n limit is used to calculate the complex particle response integrals along the orbits explicitly. This new theory is applied to downward sweeping Alfvén cascade quasimodes completing the theory of these modes and making testable predictions. These predictions are found to be consistent with experiments carried out on the Joint European Torus [P. H. Rebut and B. E. Keen, Fusion Technol. 11, 13 (1987)]. ©2009 American Institute of Physics
History: Received 6 April 2009; accepted 21 August 2009; published 30 October 2009
Permalink: http://link.aip.org/link/?PHPAEN/16/102506/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.35.Bj
    Plasma magnetohydrodynamic waves
  • 52.50.Qt
    Plasma heating by radio-frequency fields
  • 52.50.Sw
    Plasma heating by microwaves
  • 52.55.Fa
    Tokamaks
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
1070-664X (print)   1089-7674 (online)
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