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Indexed by:期刊论文

Date of Publication:2012-01-09

Journal:PHYSICS LETTERS A

Included Journals:SCIE

Volume:376

Issue:4

Page Number:505-509

ISSN No.:0375-9601

Key Words:Double tearing mode; Plasma rotation; Compressibility

Abstract:Effects of compressibility on the double tearing modes (DIMS) in rotating plasmas are numerically investigated by using a compressible magnetohydrodynamics (MHD) model. It is found that due to the compressibility effects, the threshold of the interlocking magnetic island width in the slow and intermediate rotation regimes is larger than the counterpart in the incompressible plasmas. In the fast rotation regime, the compressible effect makes the DIM islands interlock more easily and faster. Moreover, in the very fast rotation regime, the plasma rotation can more effectively suppress the DIM islands. The scalings of the interlocking threshold in the different rotation regimes are obtained. Effects of plasma viscosity and beta on the DIM interlocking in the compressible plasmas are also discussed. (C) 2011 Elsevier B.V. All rights reserved.