Nonlinear Analysis for Stabilization of Interchange Mode in LHD Plasmas

Journal Article · Thu Jul 15 00:00:00 EDT 2004 · Fusion Science and Technology

OSTI ID:20849717

Ichiguchi, Katsuji ^[1]; Nakajima, Noriyoshi ^[1]; Carreras, Benjamin A ^[2]

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1. National Institute for Fusion Science (Japan)
2. Oak Ridge National Laboratory (United States)

The nonlinear behavior of the interchange mode in Large Helical Device (LHD) plasma depends on the overlap of the vortices with different helicity. If the vortices are separated in the radial direction, each mode saturates mildly with generating the local flat regions in the pressure profile. In the case of significant overlap of the vortices, the appearance of large-scale convection results in sudden global reduction of the pressure. The sequence of the saturated pressure profile in the increase of beta can suppress the overlap. Self-organization of the pressure profile to suppress the overlap of the vortices can be the stabilizing mechanism in the LHD plasma.

• OSTI ID: 20849717
• Journal Information: Fusion Science and Technology, Vol. 46, Issue 1; Other Information: Copyright (c) 2006 American Nuclear Society (ANS), United States, All rights reserved. http://epubs.ans.org/; Country of input: International Atomic Energy Agency (IAEA); ISSN 1536-1055
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CONVECTION
HELICITY
LHD DEVICE
NONLINEAR PROBLEMS
PLASMA
PLASMA PRESSURE
STABILIZATION
VORTICES