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Stationary magnetic entropy in ohmic tokamak plasmas: Experimental evidence from the TCV device

E. Minardi, H. Weisen2001年被引用 15Nuclear FusionIF 3出版社

Electron temperature, pressure and density profiles from a large variety of ohmically heated plasmas in the TCV tokamak(BT<1.5 T, R0 = 0.88 m, a<0.25 m) are compared with theoretical predictions based on the assumption that the magnetic entropy is constant in time. These discharges include limited and diverted discharges with elongations in the range 1-2.54, triangularities in the range 0.5-0.72 and plasma currents in the range 0.1-1 MA. Over the entire range of quasi-stationary ohmic conditions it is observed that the sawtooth inversion radius and the electron temperature in the confinement region (that outside the inversion radius) depend solely on the parameter ⟨j⟩/(q0j0), where ⟨j⟩is the cross-sectionally averaged current density. These observed sawtooth inversion radii and electron temperature profiles are in excellent agreement with the predictions. The stiffness of the temperature profiles implies a correlation between density and pressure profiles, which is observed in experiment. The observed electron pressure profiles are consistent with poloidal equilibria derived by combining the requirement that magnetic entropy be constant in time with the Grad-Shafranov-Schlüter equation. The observed range of pressure profiles is however smaller than the theoretically accessible one.

日本語訳

TCVトカマク(BT<1.5 T、R0 = 0.88 m、a<0.25 m)における多種多様なオーミック加熱プラズマからの電子温度、圧力、密度分布を、磁気エントロピーが時間的に一定であるという仮定に基づく理論的予測と比較した。これらの放電には、伸長率1〜2.54、三角形度0.5〜0.72、プラズマ電流0.1〜1 MAの範囲のリミター配位およびダイバータ配位の放電が含まれる。準定常オーミック条件の全範囲にわたって、鋸歯状振動の反転半径と閉じ込め領域(反転半径の外側)の電子温度は、パラメータ⟨j⟩/(q0j0)のみに依存することが観測された。ここで⟨j⟩は断面平均電流密度である。これらの観測された鋸歯状振動の反転半径と電子温度分布は、理論的予測と極めて良く一致する。温度分布の剛直性は、密度分布と圧力分布の間の相関を示唆しており、これは実験で観測される。観測された電子圧力分布は、磁気エントロピーが時間的に一定であるという要件とグラード・シャフラノフ方程式を組み合わせて導出されたポロイダル平衡と整合する。しかしながら、観測された圧力分布の範囲は、理論的に到達可能な範囲よりも狭い。

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TCVOhmic heating
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