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OPTIMIZATION OF TOKAMAK PLASMA PRESSURE PROFILE AGAINST HIGH n IDEAL MHD BALLOONING MODES

Xiaogang Wang

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Abstract

Under the assumption that the local plasma pressure gradient is limited by high n ideal MHD ballooning modes,the optimized pressure profile is examined for noncirclar tokamaks.It is found that the q profile strongly aftects the resultant average beta value β,as well as the central beta value β0 and that the radially decreasing q profile is always favourable for enhancing the beta value.The effects of both elliptical and triangular deformations are analysed and rather stronger stabilizing effect of the latter is found.

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What this paper is about

Under the assumption that the local plasma pressure gradient is limited by high n ideal MHD ballooning modes,the optimized pressure profile is examined for noncirclar tokamaks.It is found that the q profile strongly aftects the resultant average beta value β,as well as the central beta value β0 and that the radially decreasing q profile is always favourable for enhancing the beta value.The effects of both elliptical and triangular deformations are analysed and rather stronger stabilizing effect of the latter is found.

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Available abstract

Under the assumption that the local plasma pressure gradient is limited by high n ideal MHD ballooning modes,the optimized pressure profile is examined for noncirclar tokamaks.It is found that the q profile strongly aftects the resultant average beta value β,as well as the central beta value β0 and that the radially decreasing q profile is always favourable for enhancing the beta value.The effects of both elliptical and triangular deformations are analysed and rather stronger stabilizing effect of the latter is found.

Key concepts: Ballooning, Magnetohydrodynamics, Tokamak, BETA (programming language), Plasma, Pressure gradient, Physics, Ideal (ethics)

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