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Skin size ballooning mode in tokamaks

A Hirose2007年Plasma Physics and Controlled FusionIF 2.2出版社

A skin size (k⊥ ≲ ωpe/c) plasma mode characterized by a dispersion relation ω ≃ ck⊥k∥/kDe (kDe the electron Debye wavenumber), adiabatic ions and adiabatic electrons ω ≪ k∥vTe in a uniform plasma is destabilized in tokamaks by a modest electron temperature gradient (ETG) ηe and ballooning parameter αe. The instability is of hydrodynamic (ballooning) nature and thus when unstable, a large electron thermal diffusivity emerges because of the longer cross-field wavelength than the case of the ETG mode.

日本語訳

皮膚サイズ(k⊥ ≲ ωpe/c)のプラズマモードは、分散関係 ω ≃ ck⊥k∥/kDe(kDe は電子デバイ波数)によって特徴づけられ、断熱的なイオンおよび断熱的な電子(ω ≪ k∥vTe)を伴う一様プラズマ中において、トカマクでは穏やかな電子温度勾配(ETG)ηe およびバルーニングパラメータ αe によって不安定化される。この不安定性は流体的(バルーニング的)性質を有し、したがって不安定な場合、ETG モードの場合よりも長い垂直方向波長により、大きな電子熱拡散係数が生じる。

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Ballooning mode
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