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Isotope effect on gyro-fluid edge turbulence and zonal flows

O H H Meyer, A Kendl2016年Plasma Physics and Controlled FusionIF 2.2出版社

The role of ion polarisation and finite Larmor radius on the isotope effect on turbulent tokamak edge transport and flows is investigated by means of local electromagnetic multi-species gyro-fluid computations. Transport is found to be reduced with the effective plasma mass for protium, deuterium and tritium mixtures. This isotope effect is found for both cold and warm ion models, but significant influence of finite Larmor radius and polarisation effects are identified. Sheared flow reduction of transport through self generated turbulent zonal flows and geodesic acoustic modes in the present model (not including neoclassical flows) is found to play only a minor role on regulating isotopically improved confinement.

日本語訳

イオン分極と有限ラーマー半径が、乱流トカマク周辺部の輸送および流れに対する同位体効果に及ぼす影響を、局所的電磁多種イオンジャイロ流体計算により調査した。輸送は、プロチウム、デューテリウム、トリチウムの混合において、有効プラズマ質量とともに減少することが見出された。この同位体効果は、低温イオンモデルと高温イオンモデルの両方で確認されたが、有限ラーマー半径および分極効果の顕著な影響が特定された。本モデル(新古典流を含まない)における、自己生成乱流帯状流および測地線音響モードによるせん断流の輸送低減は、同位体改善閉じ込めに対してわずかな役割しか果たさないことが見出された。

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Zonal flowEdge turbulence
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