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Ionization-driven low-frequency edge fluctuations in toroidal devices

R Singh, P K Kaw, S Mahajan1996年Plasma Physics and Controlled FusionIF 2.2出版社

A local linear stability theory of the interchange mode, the drift-resistive interchange mode and the drift-dissipative mode, in the presence of ionization and radiative drives, is examined. It is found that diffusive effects (which are responsible for providing a steady state in equilibrium) give a damping which overwhelms the ionization drive for the drift mode except for very long wavelengths. However, flute-type perturbations are found to be unstable owing to additional effects arising through the temperature dependence of the ionization cross section. Finally, the radial eigenvalue problem for simple drift-ionization instability is examined numerically and it is found that the mode is unstable for long wavelength perturbations only when the rate of diffusion damping of the perturbation is substantially smaller than the rate of diffusive damping of the equilibrium gradients.

日本語訳

交換モード、ドリフト抵抗性モード、およびドリフト散逸モードの線形安定性理論が、電離駆動と放射駆動の存在下で考察される。拡散効果(平衡状態における定常状態を提供する役割を担う)は、ドリフトモードに対して、非常に長い波長を除いて、電離駆動を凌駕する減衰を与えることが見出される。しかしながら、フルート型摂動は、電離断面積の温度依存性を通じて生じる追加的な効果により、不安定であることが判明する。最後に、単純なドリフト・電離不安定性に対する動径固有値問題が数値的に考察され、そのモードは、摂動の拡散減衰率が平衡勾配の拡散減衰率よりも実質的に小さい場合にのみ、長波長摂動に対して不安定であることが見出される。

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