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Experimental electron heat diffusion in ECH plasmas of the TJ-II stellarator

V.I. Vargas, D. López-Bruna, J. Herranz, F. Castejón, the TJ-II Team2007年被引用 26Nuclear FusionIF 3出版社

Interpretative transport has been used to revisit the global scalings of TJ-II plasmas with electron cyclotron resonance heating (ECH), from a local perspective. Density, rotational transform and ECH power scans were analysed based mainly upon Thomson scattering data (electron density and temperature) in steady state discharges. The thermal diffusivity χe is estimated assuming pure diffusion and negligible convective heat fluxes in a set of 201 discharges. The density scan indicates that for normalized minor radii ρ ≲ 0.4 there is no significant change of χe with density in the range studied , while in the density gradient region, χe decreases with line density. In the rotational transform scan, there is an overall tendency of χe to decrease with increasing rotational transform, but we also find that the presence of a low order rational value of the rotational transform is accompanied by a local lowering of χe. Finally, in the ECH power scan, χe is found to have an overall increment in 0.2 < ρ < 0.6 when QECH increases from 200 to 400 kW, although it is less significant in the density gradient region.

日本語訳

解釈的輸送を用いて、電子サイクロトロン共鳴加熱(ECH)を伴うTJ-IIプラズマのグローバルスケーリングを、局所的観点から再検討した。密度、回転変換、およびECHパワースキャンを、主にトムソン散乱データ(電子密度および電子温度)に基づいて、定常状態放電において解析した。熱拡散係数χeは、201回の放電のセットにおいて、純拡散および対流熱流束が無視できることを仮定して推定した。密度スキャンは、規格化小半径ρ≲0.4では、調査した範囲においてχeの密度による有意な変化はないことを示す一方、密度勾配領域では、χeは線平均密度とともに減少することを示す。回転変換スキャンでは、χeは回転変換の増加とともに減少する全体的な傾向があるが、回転変換の低次の有理値の存在がχeの局所的な低下を伴うことも見いだした。最後に、ECHパワースキャンでは、QECHが200kWから400kWに増加すると、χeは0.2<ρ<0.6において全体的に増加することが見いだされたが、密度勾配領域ではその増加はそれほど顕著ではない。

装置

tj-ii高精度(タイトル一致)

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StellaratorElectron cyclotron heatingTJ-II
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