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Understanding LOC/SOC phenomenology in tokamaks

J.E. Rice, J. Citrin, N.M. Cao, P.H. Diamond, M. Greenwald, B.A. Grierson2020年被引用 18Nuclear FusionIF 3出版社

Phenomenology of Ohmic energy confinement saturation in tokamaks is reviewed. Characteristics of the linear Ohmic confinement (LOC) and saturated Ohmic confinement (SOC) regimes are documented and transformations in all transport channels across the LOC/SOC transition are described, including rotation reversals, 'non-local' cut-off and density peaking, in addition to dramatic changes in fluctuation intensity. Unification of results from nearly 20 devices indicates that the LOC/SOC transition occurs at a critical value of the product of the density, edge safety factor and device major radius, and that this product increases with toroidal magnetic field. Comparison with gyro-kinetic simulations suggests that the effects of sub-dominant TEMs are important in the LOC regime while ITG mode turbulence dominates with SOC.

日本語訳

トカマクにおけるオーミック閉じ込めの飽和の現象論を概説する。線形オーミック閉じ込め(LOC)および飽和オーミック閉じ込め(SOC)領域の特性を文書化し、LOC/SOC遷移にわたるすべての輸送チャネルにおける変遷を記述する。これには、回転反転、非局所的遮断、密度ピーキング、ならびに揺動強度の劇的な変化が含まれる。約20の装置からの結果の統合は、LOC/SOC遷移が密度、端部安全係数、および装置大半径の積の臨界値において発生することを示し、この積はトロイダル磁場とともに増加する。ジャイロ運動論的シミュレーションとの比較は、LOC領域では準優勢な捕捉電子モード(TEM)の効果が重要である一方、SOCではイオン温度勾配(ITG)モードの乱流が支配的であることを示唆する。

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