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Ablation model including the particle energy distribution function and pellet ablation by hot ions in Heliotron E

Y. Nakamura, S. Kiji, M. Wakatani, H. Zushi, S. Sudo, T. Baba1992年被引用 7Nuclear FusionIF 3出版社

The authors present a neutral gas shielding model including the distribution function of particles carrying the heat for ablation. In an ohmically heated tokamak, high energy electrons in the tail part of the Maxwellian with E approximately=6-8 Te contribute significantly to the ablation process at the pellet surface. A simple scaling for the pellet ablation rate is given which takes into account the Maxwellian electron energy distribution. The pellet penetration depth obtained with the model presented agrees well with the multigroup approximation for an energy distribution during ablation by Houlberg et al. (1988). Pellet ablation dominated by hot ions was obtained in a special NBI heated Heliotron E plasma with an electron temperature much lower than the ion temperature

日本語訳

著者らは、消融を担う粒子の分布関数を含む中性ガス遮蔽モデルを提示する。オーム加熱トカマクにおいて、マクスウェル分布の高エネルギー尾部に位置するE≈6〜8 Teの電子が、ペレット表面での消融過程に有意に寄与する。マクスウェル電子エネルギー分布を考慮したペレット消融速度の簡易スケーリング則を示す。本モデルによるペレット侵入深さは、Houltonら(1988)による多群近似を用いたエネルギー分布計算の結果と良く一致する。また、電子温度がイオン温度よりも著しく低いNBI加熱Heliotron Eプラズマでは、高温イオンによる消融が支配的となる結果が得られた。

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