Saturation of a tearing mode in zero-{beta} full magnetohydrodynamics

Journal Article · Thu Mar 15 04:00:00 EDT 2007 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.2710799· OSTI ID:20974880

Arcis, N; Escande, D F; Ottaviani, M ^[1]

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1. Association Euratom-CEA, DSM/DRFC/SCCP, CEA Cadarache, Bat. 513, 13108 St-Paul-lez-Durance (France)

Within the cylindrical approximation, the nonlinear saturation of a tearing mode island in the full magnetohydrodynamics (MHD) model with no pressure and a uniform resistivity profile is described using a recent perturbation method based on the technique of matched asymptotic expansion, where the perturbation parameter is the island width w{sub s}. The matching condition provides the saturation equation for w{sub s} that is given to the adequate order and does not depend on the normalization length. This enables to prove that the errors due to reduced MHD (RMHD) are negligible in the calculation of tearing mode saturation in the tokamak. It also provides a way to benchmark MHD numerical simulations of magnetic self-reversal for the reversed-field pinch where RMHD does not apply.

• OSTI ID: 20974880
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 14; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
APPROXIMATIONS
BENCHMARKS
CYLINDRICAL CONFIGURATION
DISTURBANCES
EQUATIONS
ERRORS
ISLANDS
LENGTH
MAGNETOHYDRODYNAMICS
NONLINEAR PROBLEMS
PLASMA
PLASMA SIMULATION
REVERSE-FIELD PINCH
REVERSED-FIELD PINCH DEVICES
TEARING INSTABILITY
TOKAMAK DEVICES
WIDTH