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Ideal ballooning stability in tokamak plasmas with rigid-body toroidal rotation

H R Wilson1993年Plasma Physics and Controlled FusionIF 2.2出版社

The problem of ideal ballooning stability in the presence of a rigid-body toroidal rotation is revisited. The equations describing the stability of a tokamak plasma to high-n ideal ballooning modes are derived without further approximations other than those of ideal magnetohydrodynamics. The equilibrium temperature profile is taken to be such that temperature is constant on a flux surface. A simplification of the model is obtained by considering a large aspect ratio ordering, from which it is found that ballooning stability is governed by a second-order differential equation (as in the case with no flow). In a large aspect ratio equilibrium in which the pressure profile has a narrow region of enhanced pressure gradient it is shown that the effect of the rotation is simply to modify the pressure gradient parameter, alpha , and that the structure of the equations describing the stability is not altered.

日本語訳

理想的なバルーニング安定性の問題を、剛体トロイダル回転の存在下で再考する。トカマクプラズマの高nバルーニングモードに対する安定性を記述する方程式は、理想磁気流体力学の近似以外の追加近似なしに導出される。平衡温度分布は、磁気面上で温度が一定となるように取られる。モデルの簡略化は、大アスペクト比オーダリングを考慮することによって得られ、そこからバルーニング安定性が(流れがない場合と同様に)2階微分方程式によって支配されることがわかる。圧力分布が狭い領域の圧力勾配の増大を持つ大アスペクト比平衡において、回転の効果は単に圧力勾配パラメータαを修正するだけであり、安定性を記述する方程式の構造は変化しないことが示される。

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Ballooning modeToroidal rotation
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