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Stabilizing impact of high gradient of beta on microturbulence

Phys. Plasmas 10, 2881 (2003); doi:10.1063/1.1585032

Issue Date: July 2003

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C. Bourdelle
Association Euratom-CEA, CEA/DSM/DRFC, CEA Cadarache, 13108 Saint-Paul-lez-Durance, France

W. Dorland
Department of Physics, University of Maryland, College Park, Maryland 20742

X. Garbet
Association Euratom-CEA, CEA/DSM/DRFC, CEA Cadarache, 13108 Saint-Paul-lez-Durance, France

G. W. Hammett
Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543

M. Kotschenreuther
Institute for Fusion Studies, University of Texas at Austin, Austin, Texas 78712

G. Rewoldt and E. J. Synakowski
Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543
It is shown here that microturbulence can be stabilized in the presence of steep temperature and density profiles. Indeed in high beta plasmas, pressure profile gradients are associated with high |beta[prime]| = –[partial-derivative]beta/[partial-derivative]rho, where beta= P/(B2/2µ0) and rho the square root of the toroidal flux normalized to its edge value. It is shown here that high values of |beta[prime]| have a stabilizing influence on drift modes. This may form the basis for a positive feedback loop in which high core beta values lead to improved confinement, and to further increase in beta. A gyrokinetic electromagnetic flux tube code, GS2 [M. Kotschenreuther, G. Rewoldt, and W. M. Tang, Comput. Phys. Commun. 88, 128 (1995)], is used for analyzing the microstability. In high beta spherical tokamak plasmas, high |beta[prime]| rather than low aspect ratio is a source of stabilization. Therefore, the effect of high |beta[prime]| should be stabilizing in the plasmas of the National Spherical Torus Experiment [Y.-K. Peng, M. G. Bell, R. E. Bell et al., Phys. Plasmas 7, 1681 (2000)].©2003 American Institute of Physics.
History: Received 6 March 2003; accepted 30 April 2003
Permalink: http://link.aip.org/link/?PHPAEN/10/2881/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.35.Ra
    Plasma turbulence
  • 52.55.Fa
    Tokamaks
  • 52.35.Qz
    Plasma microinstabilities including ion-acoustic, two-stream, loss-cone, beam-plasma, drift, ion- or electron-cyclotron instabilities, etc
  • YEAR: 2003

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ISSN:
1070-664X (print)   1089-7674 (online)
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REFERENCES (23)
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