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Impurity transport studies in RFX-mod multiple helicity and enhanced confinement QSH regimes

S Menmuir, L Carraro, A Alfier, F Bonomo, A Fassina, G Spizzo, N Vianello2010年Plasma Physics and Controlled FusionIF 2.2出版社

The transport of intrinsic and artificially introduced impurities is investigated in the multiple helicity (MH) and quasi-single helicity (QSH) plasma regimes of the RFX-mod reversed-field pinch. Impurities are introduced through Ni laser blow-off and Ne gas puffing in both magnetic confinement scenarios. Simulation of experimental spectroscopic measurements, including line and soft x-ray emission, electron density and radiated power is carried out with a one-dimensional collisional–radiative model. For both QSH and MH an outwardly directed pinch velocity with a large barrier in the edge and no reversal is determined, accompanied by a diffusion coefficient that is an order of magnitude greater in the core than at the edge. The established transport parameters are similar for the Ni and Ne injected impurities with the transition region and barrier less external and stronger in the QSH regime.

日本語訳

RFX-mod反転磁場ピンチの多重ヘリシティ(MH)および準単一ヘリシティ(QSH)プラズマ領域において、固有不純物および人為的に導入された不純物の輸送を調査した。不純物は、両方の磁気閉じ込めシナリオにおいて、NiレーザーブローオフおよびNeガスパフによって導入される。線スペクトルおよび軟X線放射、電子密度、放射パワーを含む実験的分光測定のシミュレーションは、一次元衝突放射モデルを用いて実施された。MHおよびQSHの両方において、外部方向のピンチ速度が大きな障壁を伴って端部で観測され、反転は見られなかった。また、拡散係数は端部よりもコア領域で一桁大きい値となった。得られた輸送パラメータは、NiおよびNe注入不純物の両方で類似しており、遷移領域と障壁はQSH regimeにおいてより外部に位置し、より弱いことが示された。

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