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Excitation of Alfvén eigenmodes by low energy beam ions in the DIII-D and JET tokamaks

Phys. Plasmas 15, 056107 (2008); doi:10.1063/1.2839286

Published 27 February 2008

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R. Nazikian,1 N. N. Gorelenkov,1 B. Alper,2 H. L. Berk,3 D. Borba,4 R. V. Budny,1 G. Y. Fu,1 W. W. Heidbrink,5 G. J. Kramer,1 M. A. Makowski,6 S. D. Pinches,2 S. E. Sharapov,2 W. M. Solomon,1 E. J. Strait,7 R. B. White,1 M. A. Van Zeeland,7 and JET-EFDA contributors
1Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA
2Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon OX14 3DB, United Kingdom
3University of Texas at Austin, Austin, Texas 78712, USA
4Euratom/IST Fusion Association, Centro de Fusao Nuclear, Lisboa, Portugal
5University of California Irvine, Irvine, California 92697, USA
6Lawrence Livermore National Laboratory, Livermore, California 94550, USA
7General Atomics, San Diego, California 92186-5608, USA
Core localized Alfvén eigenmodes in DIII-D [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] and Joint European Torus (JET) [P. H. Rebut and B. E. Keen, Fusion Technol. 11, 13 (1987)] plasmas are driven by deuterium neutral beam ions traveling well below the Alfvén speed. Modes are observed in reverse magnetic shear discharges with deuterium ion velocities as low as 0.23 and 0.16 of the Alfvén speed parallel to the magnetic field in DIII-D and JET plasmas, respectively. Ellipticity-induced Alfvén eigenmodes in DIII-D and toroidicity-induced Alfvén eigenmodes in JET are excited by deuterium ions traveling well below the fundamental passing ion resonance condition, indicating the role of high-order resonances in driving these modes. NOVA-K analysis reveals many high-order resonances as contributing to the mode drive at high central safety factor due to the correspondingly large poloidal orbit width and the decrease in the perpendicular scale length of the modes. ©2008 American Institute of Physics
History: Received 13 November 2007; accepted 10 January 2008; published 27 February 2008
Permalink: http://link.aip.org/link/?PHPAEN/15/056107/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.55.Fa
    Tokamaks
  • 52.55.Pi
    Fusion products effects and fast particle effects in plasma
  • 52.80.-s
    Electric discharges
  • 52.35.Bj
    Plasma magnetohydrodynamic waves
  • YEAR: 2008

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