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Energetic ion beta scaling of q ≳ 1 non-resonant modes in tokamak plasmas with a weak magnetic shear configuration

Xian-Qu Wang, Xiao-Gang Wang2015年Plasma Physics and Controlled FusionIF 2.2出版社

Fast ion beta scaling of non-resonant modes (NRMs) with a safety factor profile close to but above unity ( 1) in tokamak plasmas with a reversed magnetic shear configuration, particularly those with a weak shear ( ~ 0) of around , are analysed in this study. It is found that, in three different regimes of magnetic shear configuration, the fast ion beta scaling of the NRM growth rate are: (1) in the small but finite regime, (2) , in the = 0 regime, and (3) in an almost flat q-profile regime. The scalings suggest that the growth rate of the mode is related to the fast ion beta and weakens as the q-profile is flattened. The dispersion relation of NRM in the = 0 regime is then derived and analysed.

日本語訳

トカマクプラズマにおける、安全係数プロファイルが1に近いが1を超える(q≳1)非共鳴モード(NRM)の高速イオンベータスケーリングを、反転磁気シア配位、特に弱い磁気シア(s〜0)を有する場合について解析した。磁気シア配位の3つの異なる領域において、NRM成長率の高速イオンベータスケーリングは以下の通りである:(1)小さいが有限のs領域ではβ_f^α、(2)s = 0領域ではβ_f^α'、(3)ほぼ平坦なqプロファイル領域ではβ_f^α''。これらのスケーリングは、モードの成長率が高速イオンベータに関連し、qプロファイルが平坦化するにつれて弱まることを示唆している。次に、s = 0領域におけるNRMの分散関係を導出し、解析した。

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