Rotating nonlinear magnetic islands in a tokamak plasma

Journal Article · Mon May 01 04:00:00 EDT 1995 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.871308· OSTI ID:46360

Smolyakov, A I; Hirose, A ^[1]; Lazzaro, E; Re, G B ^[2]; Callen, J D ^[3]

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1. Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 0W0 (Canada)
2. Istituto di Fisica del Plasma, CNR-EURATOM, Milan (Italy)
3. Department of Nuclear Engineering and Engineering Physics, University of Wisconsin, Madison, Wisconsin 53706-1687 (United States)

The nonlinear dynamics of rotating low {ital m} (poloidal mode number) tearing modes in a tokamak with external resonant magnetic perturbations is examined. Nonlinear evolution equations for the island width and the toroidal rotation frequency are derived within the two-fluid magnetohydrodynamic model, taking into account the plasma rotation and neoclassical parallel viscosity. The nonlinear stability of magnetic islands interacting with a static external magnetic perturbation is considered, and the critical magnetic field for the appearance of a locked mode is determined. It is shown that the coupling of the perpendicular and longitudinal plasma flow due to the neoclassical plasma viscosity enhances the amplitude of the critical magnetic field compared to the value obtained in a slab approximation. The perpendicular plasma viscosity causes a finite phase shift between the applied external field and the magnetic island, and further increases the value of the critical magnetic field required to induce a magnetic island.

• DOE Contract Number: FG02-86ER53218
• OSTI ID: 46360
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 2; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
MAGNETIC ISLANDS
MAGNETOHYDRODYNAMICS
PERTURBATION THEORY
ROTATING PLASMA
TEARING INSTABILITY
TOKAMAK DEVICES
VISCOSITY