NONLINEAR CALCULATION OF THE M=1 INTERNAL KINK INSTABILITY IN CURRENT CARRYING STELLARATORS

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概要

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• Nonlinear properties of the m=1 internal kink mode are shown in a low βcurrent carrying stellarator. The effects of the external helical magnetic fields are considered through a rotational transform and the magnetic surface is assumed to be circular. Magnetic surfaces inside the τ_h +τ_σ=1 surface shift and deform non-circularly, while magnetic surfaces outside the τ_h +τ_σ=1 are not disturbed, where τ_h is a rotational transform due to helical magnetic fields and τ_σ is due to a plasma current. Many higher harmonics are excited after the fundamental mode saturates. When the external helical magnetic fields are lowered, the m=1 tearing mode similar to that in a low β tokamak grows and magnetic islands appear near the τ_h+τ_σ=1 surface. For adequate helical magnetic fields, the current carrying stellarator becomes stable against both the m=1 internal kink mode and the m=1 tearing mode, without lowering the rotational transform.

• 核融合科学研究所の論文

著者

• Wakatani M.

  Institute Of Plasma Physics Nagoya University

関連論文

• NONLINEAR CALCULATION OF THE M=1 INTERNAL KINK INSTABILITY IN CURRENT CARRYING STELLARATORS

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