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Magnetic shear effects on confinement and electron heat transport in Tore Supra discharges with electron heating

G.T. Hoang, B. Saoutic, L. Guiziou, V. Basiuk, A. Bécoulet, R.V. Budny, F. Clairet, L. Colas, P. Devynck, C. Gil1998年被引用 46Nuclear FusionIF 3出版社

Various steady state non-inductive plasmas, with strong electron heating and significant modification of the current density profile, have been routinely obtained in Tore Supra discharges with lower hybrid current drive (LHCD) and/or fast wave electron heating (FWEH) experiments. The dependence of the electron heat diffusivity χe on the electron temperature gradient ∇Te, the magnetic shear s and the safety factor q is demonstrated. The increase of χe with ∇Te indicates the existence of a critical temperature gradient. Moreover, the current density profile affects the global confinement and the local transport. The electron heat flux qe is found to be roughly proportional to q2. The effect of magnetic shear on χe is studied in the improved confinement discharges obtained by modifying the current profile. When the magnetic shear increases in the confinement zone and/or vanishes in the plasma centre, χe decreases. The effect of the current profile is also observed in the saturated ohmic regime. The results for χe do not agree with the local transport models of Taroni et al. or Rebut-Lallia-Watkins (RLW) for all ranges of electronheating.

日本語訳

様々な定常非誘導プラズマが、低域混成波電流駆動(LHCD)および/または高速波電子加熱(FWEH)を用いたTore Supra放電において、強い電子加熱と電流密度分布の顕著な変化を伴って日常的に得られている。電子熱拡散係数χeの電子温度勾配∇Te、磁気シアs、および安全係数qへの依存性が実証されている。∇Teに対するχeの増加は、臨界温度勾配の存在を示している。さらに、電流密度分布は全体の閉じ込めと局所的な輸送に影響を及ぼす。電子熱流束qeはq2にほぼ比例することが見出されている。電流密度分布の変更によって得られた改善閉じ込め放電において、磁気シアsがχeに及ぼす影響が研究されている。閉じ込め領域において磁気シアが増加し、および/またはプラズマ中心部で磁気シアが消失すると、χeは減少する。電流密度分布の影響は、飽和オーミック領域においても観測されている。χeに関する結果は、電子加熱の全範囲において、TaroniらまたはRebut-Lallia-Watkins(RLW)の局所輸送モデルとは一致しない。

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Tore SupraMagnetic shearHeat transportElectron heatingElectron heat transport
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