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Transport analysis in an electron cyclotron heating power scan of TJ-II plasmas

S Tallents, D López-Bruna, J L Velasco, M A Ochando, B Ph Van Milligen, V I Vargas, J J Martinell, D Tafalla, J M Fontdecaba, J Herranz2014年Plasma Physics and Controlled FusionIF 2.2出版社

The response of transport in low density (line average ) plasmas to electron cyclotron resonance heating (ECH) power, 100 kW ≲ QECH ≲ 400 kW, is documented for the TJ-II Heliac-type stellarator. Radially resolved electron heat balance shows no significant differences between boron or lithium coating of the vacuum chamber walls. The main trends in electron heat transport are found to be similar to other stellarator/heliotron devices and are compatible with neoclassical calculations in the bulk of the plasma. According to our calculations the heat fluxes are anomalous near the edge, ρ ≳ 0.8 where ρ is the normalized minor radius, but the uncertainties there are large. Particle transport in the density gradient region, ρ ≈ 0.8, has little sensitivity to the variation of heating power and is compatible with neoclassical predictions. Neoclassical transport of particles and electron heat is found to be dominant in the gradient regions of typical ECH plasmas of the TJ-II Heliac.

日本語訳

低線密度(ライン平均密度)プラズマにおける電子サイクロトロン共鳴加熱(ECH)パワー、100 kW ≲ Q ≲ 400 kW、に対する輸送応答を、TJ-IIヘリアック型ステラレータについて記録した。径方向に分解された電子熱バランスは、真空容器壁のボロンコーティングとリチウムコーティングの間で有意な差を示さない。電子熱輸送の主たる傾向は、他のステラレータ/ヘリオトロン装置と類似していることが見出され、バルクプラズマ内では新古典理論計算と整合する。我々の計算によれば、熱流束はエッジ近傍(ρ ≳ 0.8、ここでρは規格化最小半径)では異常であるが、そこでの不確実性は大きい。密度勾配領域(ρ ≈ 0.8)における粒子輸送は、加熱パワーの変化に対してほとんど感度を示さず、新古典予測と整合する。TJ-IIヘリアックの典型的なECHプラズマの勾配領域では、粒子および電子の新古典輸送が支配的であることが見出された。

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tj-ii高精度(タイトル一致)

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Electron cyclotron heatingTJ-II
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