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Two techniques were developed at DIII-D [J. L. Luxon, Nucl. Fusion 42, 64 (2002)] to tackle ITER-specific aspects of neoclassical tearing mode (NTM) control, namely, (1) the relatively small size of t...
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Properties of microturbulence in toroidal plasmas with reversed magnetic shear

Phys. Plasmas 16, 102503 (2009); doi:10.1063/1.3243918

Published 8 October 2009

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Wenjun Deng and Zhihong Lin
Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
Electrostatic drift wave turbulence in tokamak plasmas with reversed magnetic shear is studied using global gyrokinetic particle simulations. The linear eigenmode of the ion temperature gradient (ITG) instability exhibits a mode gap around the minimum safety factor (qmin) region, particularly when qmin is an integer, due to the rarefaction of rational surfaces. The collisionless trapped electron mode (CTEM) instability is suppressed in the negative-shear region due to the reversal of the toroidal precessional drift of trapped electrons. However, after nonlinear saturation, the ITG gap is filled up by the turbulence spreading and the CTEM fluctuation propagates into the stable negative-shear region. The steady state turbulence occupies the whole volume without any identifiable gap or coherent structures of the heat conductivity, perturbed temperature, or zonal flows in the qmin location or the reversed shear region. Our finding indicates that the electrostatic drift wave turbulence itself does not support either linear or nonlinear mechanism for the formation of internal transport barriers in the reversed magnetic shear when qmin crossing an integer. ©2009 American Institute of Physics
History: Received 6 August 2009; accepted 15 September 2009; published 8 October 2009
Permalink: http://link.aip.org/link/?PHPAEN/16/102503/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.35.Ra
    Plasma turbulence
  • 52.25.Gj
    Plasma fluctuation and chaos phenomena
  • 52.35.Fp
    Plasma electrostatic waves and oscillations
  • 52.35.Kt
    Plasma drift waves
  • 52.35.Mw
    Nonlinear phenomena: plasma waves, wave propagation and other interactions
  • 52.35.Qz
    Plasma microinstabilities
  • YEAR: 2009

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PUBLICATION DATA

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