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Local dependence of ion temperature gradient on magnetic configuration, rotational shear and turbulent heat flux in MAST

Y.-c. Ghim, A.R. Field, A.A. Schekochihin, E.G. Highcock, C. Michael, the MAST Team2014年被引用 8Nuclear FusionIF 3出版社

Experimental data from the Mega Amp Spherical Tokamak (MAST) is used to show that the inverse gradient scale length of the ion temperature has its strongest local correlation with the rotational shear and the pitch angle of the magnetic field. Furthermore, is found to be inversely correlated with the gyro-Bohm-normalized local turbulent heat flux estimated from the density fluctuation level measured using a 2D beam emission spectroscopy diagnostic. These results can be explained in terms of the conjecture that the turbulent system adjusts to keep close to a certain critical value (marginal for the excitation of turbulence) determined by local equilibrium parameters (although not necessarily by linear stability).

日本語訳

メガアンプ球状トカマク(MAST)からの実験データを用いて、イオン温度の逆勾配スケール長が、回転シアおよび磁場のピッチ角と最も強い局所相関を示すことを明らかにする。さらに、この逆勾配スケール長は、2次元ビーム発光分光法を用いて測定された密度揺動レベルから推定されるジャイロボーム規格化局所乱流熱流束と逆相関することが見出された。これらの結果は、乱流系が、局所平衡パラメータによって決定される(必ずしも線形安定性によるものではないが)特定の臨界値(乱流励起に対して限界的な値)に近づくように調整されるという仮説によって説明することができる。

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mast高精度(タイトル一致)

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MASTIon temperature gradient
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