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Physics of Plasmas / Volume 5 / Issue 8 / ARTICLES

Phys. Plasmas 5, 2921 (1998); http://dx.doi.org/10.1063/1.873014 (11 pages)

Toroidally localized and nonlocalized ballooning instabilities in a stellarator

P. Cuthbert1, J. L. V. Lewandowski1, H. J. Gardner1, M. Persson1, D. B. Singleton2, R. L. Dewar3, N. Nakajima3, and W. A. Cooper4

1Department of Theoretical Physics and Plasma Research Laboratory, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, A.C.T. 0200, Australia
2ANU Supercomputer Facility, The Australian National University, Canberra, A.C.T. 0200, Australia
3National Institute for Fusion Science, 322-6 Oroshi-cho, Toki, Gifu 509-52, Japan
4Centre de Recherche en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, PPB Ecublens, CH-1015 Lausanne, Switzerland

(Received 19 January 1998; accepted 27 April 1998)

It is shown that the coexistence of toroidally nonlocalized ideal-hydromagnetic ballooning instabilities, with a quasidiscrete spectrum, and toroidally localized ballooning instabilities with a broad continuous spectrum, as predicted by Dewar and Glasser [Phys. Fluids 26, 3038 (1983)] can be realized in a Mercier-unstable equilibrium case modeling the Large Helical Device (LHD) [A. Iiyoshi et al., Fusion Technol. 17, 148 (1990)] with a broad pressure profile. The quasidiscrete, interchange branch corresponds to extended modes that can be understood on the basis of a ripple-averaged ballooning equation, whereas the broad-continuum, ballooning branch corresponds to modes localized along a flux tube. The physical origin of the two branches is discussed. © 1998 American Institute of Physics.

© 1998 American Institute of Physics

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KEYWORDS and PACS

Keywords

stellarators, ballooning instability, plasma magnetohydrodynamics, plasma pressure

PACS

  • 52.55.Jd

    Magnetic mirrors, gas dynamic traps

  • 52.35.Py

    Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)

  • 52.30.-q

    Plasma dynamics and flow

  • 52.65.Kj

    Magnetohydrodynamic and fluid equation

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.873014

PUBLICATION DATA

ISSN

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

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    R. L. Dewar and A. H. Glasser, Phys. Fluids 26, 3038 (1983)PFLDAS000026000010003038000001.

    N. Nakajima, Phys. Plasmas 3, 4556 (1996)PHPAEN000003000012004556000001.

    A. H. Boozer, Phys. Fluids 25, 520 (1982)PFLDAS000025000003000520000001.

    R. L. Dewar, D. A. Monticello, and W. N.-C. Sy, Phys. Fluids 27, 1723 (1984)PFLDAS000027000007001723000001.

    E. D. Fredrickson, K. M. McGuire, Z. Y. Chang, A. Janos, J. Manickam, G. Taylor, S. Mironov, I. Semenov, D. Kislov, and D. Martynov, Phys. Plasmas 3, 2620 (1996)PHPAEN000003000007002620000001.


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