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Spreading of lower hybrid wave driven currents in PBX-M

D.W. Ignat, R. Kaita, S.C. Jardin, M. Okabayashi1996年被引用 10Nuclear FusionIF 3出版社

Lower hybrid current drive (LHCD) in the tokamak Princeton Beta Experiment-Modification (PBX-M) is computed with a dynamic model in order to understand an actual discharge aimed at raising the central q above unity. Such configurations offer advantages for steady state operation and plasma stability. For the particular parameters of this PBX-M experiment, the calculation found singular profiles of plasma current density J and safety factor q developing soon after LHCD begins. Smoothing the lower hybrid wave driven current and power using a diffusion-like equation and a velocity-independent diffusivity for fast-electron current brought the model into reasonable agreement with the measurements if Dfast approximately=1.0 m2/s. Such a value for Dfast is in the range suggested by other work

日本語訳

トカマク型実験装置プリンシントン・ベータ実験改修(PBX-M)における低域混成波電流駆動(LHCD)を、中心q値を1以上に上昇させることを目的とした実際の放電を理解するために、動的モデルを用いて計算した。このような配位は、定常運転とプラズマ安定性に利点をもたらす。このPBX-M実験の特定のパラメータに対して、計算では、LHCD開始直後に発達するプラズマ電流密度Jと安全係数qの特異な分布が見いだされた。拡散型方程式と高速電子電流に対する速度に依存しない拡散係数を用いて低域混成波駆動電流とパワーを平滑化することにより、Dfast≒1.0 m2/sの場合に、モデルは測定値と妥当な一致を示した。このようなDfastの値は、他の研究で示唆されている範囲内にある。

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