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Helical temperature perturbations associated with tearing modes in tokamak plasmas

Phys. Plasmas 2, 825 (1995); doi:10.1063/1.871434

Issue Date: March 1995

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Richard Fitzpatrick
Institute for Fusion Studies, The University of Texas at Austin, Austin, Texas 78712
An investigation is made into the electron temperature perturbations associated with tearing modes in tokamak plasmas. It is found that there is a critical magnetic island width below which the conventional picture where the temperature is flattened inside the separatrix is invalid. This effect comes about because of the stagnation of magnetic field lines in the vicinity of the rational surface and the finite parallel thermal conductivity of the plasma. Islands whose widths lie below the critical value are not destabilized by the perturbed bootstrap current, unlike conventional magnetic islands. This effect may provide an explanation for some puzzling experimental results regarding error field-induced magnetic reconnection. The critical island width is found to be fairly substantial in conventional tokamak plasmas, provided that the long mean-free path nature of parallel heat transport and the anomalous nature of perpendicular heat transport are taken into account in the calculation. ©1995 American Institute of Physics.
History: Received 12 September 1994; accepted 28 November 1994
Permalink: http://link.aip.org/link/?PHPAEN/2/825/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.35.Py
    Physics of plasmas and electric discharges Waves, oscillations, and instabilities in plasma Plasma macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, RayleighTaylor, etc.)
  • 52.55.Fa
    Physics of plasmas and electric discharges Magnetic confinement and equilibrium Tokamaks
  • 52.40.Hf
    Physics of plasmas and electric discharges Plasma interactions Plasmawall interactions; boundary layer effects; plasma sheaths
  • 52.30.Jb
    Physics of plasmas and electric discharges Plasma flow; magnetohydrodynamics Resistive MHD effects
  • YEAR: 1995

PUBLICATION DATA

ISSN:
1070-664X (print)   1089-7674 (online)
Publisher:
AIP is a member of CrossRef AIP

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