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Physics of Plasmas / Volume 19 / Issue 2 / ARTICLES / Magnetically Confined Plasmas, Heating, Confinement

Phys. Plasmas 19, 022503 (2012); http://dx.doi.org/10.1063/1.3684648 (8 pages)

Hybrid-like 2/1 flux-pumping and magnetic island evolution due to edge localized mode-neoclassical tearing mode coupling in DIII-D

J. D. King1,2, R. J. La Haye3, C. C. Petty3, T. H. Osborne3, C. J. Lasnier1, R. J. Groebner3, F. A. Volpe4, M. J. Lanctot1, M. A. Makowski1, C. T. Holcomb1, W. M. Solomon5, S. L. Allen1, T. C. Luce3, M. E. Austin6, W. H. Meyer1, and E. C. Morse2

1Lawrence Livermore National Laboratory, Livermore, California 94550, USA
2University of California-Berkeley, Berkeley, California 94720, USA
3General Atomics, P.O. Box 85608, San Diego, California 92186, USA
4University of Wisconsin-Madison, Madison, Wisconsin 53715, USA
5Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA
6University of Texas-Austin, Austin, Texas 78712, USA

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(Received 9 September 2011; accepted 5 January 2012; published online 17 February 2012)

Direct analysis of internal magnetic field pitch angles measured using the motional Stark effect diagnostic shows m/n = 2/1 neoclassical tearing modes exhibit stronger poloidal magnetic flux-pumping than typical hybrids containing m/n = 3/2 modes. This flux-pumping causes the avoidance of sawteeth, and is present during partial electron cyclotron current drive suppression of the tearing mode. This finding could lead to hybrid discharges with higher normalized fusion performance at lower q95. The degree of edge localized mode-neoclassical tearing mode (ELM-NTM) coupling and the strength of flux-pumping increase with beta and the proximity of the modes to the ELMing pedestal. Flux-pumping appears independent of magnetic island width. Individual ELM-NTM coupling events show a rapid timescale drop in the island width followed by a resistive recovery that is successfully modeled using the modified Rutherford equation. The fast transient drop in island width increases with ELM size.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. 2/1 STATIONARY HYBRID DISCHARGE
  3. EFFECT OF SUPPRESSION
  4. ELM-NTM COUPLING
    1. Island shrinking and ELM size
    2. Resistive recovery of the island width
  5. CONCLUSIONS

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KEYWORDS, PACS, and IPC

Keywords

plasma boundary layers, plasma nonlinear processes, plasma simulation, plasma toroidal confinement, tearing instability, Tokamak devices

PACS

  • 52.35.Mw

    Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)

  • 52.35.Py

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

  • 52.40.Hf

    Plasma-material interactions; boundary layer effects

  • 52.55.Fa

    Tokamaks, spherical tokamaks

  • 52.65.-y

    Plasma simulation

International Patent Classification (IPC)

  • H05H1/02

    Arrangements for confining plasma by electric or magnetic fields; Arrangements for heating plasma

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3684648

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.
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