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Transport studies in the TEXT Tokamak

K W Gentle, R D Bengtson, R Bravenec, D L Brower, W L Hodge, T P Kochanski, N C Luhmann Jr, D Paterson, W A Peebles, P E Phillips1984年Plasma Physics and Controlled FusionIF 2.2出版社

The TEXT tokamak (BT=3 T; R=1 m; a=.27 m) has been used for extensive studies of particle and electron thermal transport and of the microturbulence which may be causing the transport, which is observed to be far greater than neoclassical predictions. Transport may be determined as a function of minor radius except in the edge 5 cm; observations of turbulence span the entire cross-section. For impurity ion transport, a simple combination of diffusion and inward convection accurately describes the evolution of Sc+10 through Sc+18 following scandium injection by laser ablation. The coefficients show no strong dependence on plasma current or density. Applying these same coefficients to hydrogen implies equilibrium profiles and response to gas puffing consistent with those observed. Electron thermal transport is similar to that in other ohmic discharges. The associated microturbulence has been thoroughly characterized by FIR scattering throughout the plasma volume, supplemented by edge probe measurements. The density fluctuations can be generically described as strong drift-wave turbulence, propagating in the electron diamagnetic direction with an average phase velocity above vde, peaking at kperpendicular to rho s<1, and larger at the edge. The edge measurements confirm that the turbulence drives an outward radial particle flux.

日本語訳

TEXTトカマク(BT=3 T; R=1 m; a=.27 m)は、粒子および電子熱輸送、ならびに新古典論的予測よりもはるかに大きいと観測される輸送の原因となり得る微視的乱流の広範な研究に使用されてきた。輸送は、端部の5 cmを除き、小半径の関数として決定され得る。乱流の観測は断面全体に及ぶ。不純物イオン輸送については、拡散と内向き対流の単純な組み合わせにより、レーザーアブレーションによるスカンジウム注入後のSc+10からSc+18までの時間発展が正確に記述される。これらの係数は、プラズマ電流や密度に対する強い依存性を示さない。同じ係数を水素に適用すると、平衡分布およびガス入射に対する応答が観測結果と一致する。電子熱輸送は、他のオーミック放電におけるものと類似している。関連する微視的乱流は、プラズマ体積全体にわたるFIR散乱測定と、端部におけるプローブ測定によって徹底的に特徴付けられている。密度揺動は、電子反磁性方向に伝播し、平均位相速度がvdeを超え、k⊥ρs<1でピークを示す強いドリフト波乱流として一般的に記述され得る。端部測定により、この乱流が外向きの径方向粒子フラックスを駆動することが確認される。

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