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Light impurity transport studies with solid pellet injections in the RFX-mod reversed-field pinch

T Barbui, L Carraro, P Franz, P Innocente, S Munaretto, G Spizzo2015年Plasma Physics and Controlled FusionIF 2.2出版社

The transport of injected impurities is investigated in the multiple helicity (MH) and improved confinement quasi single helicity (QSH) magnetic regimes of RFX-mod reversed-field pinch. Impurities are introduced through injections of room temperature pellets of carbon (in MH and QSH) and lithium (in MH). Simulation of experimental spectroscopic measurements, including line and soft x-rays emission, electron density and radiated power is carried out with a 1D collisional-radiative impurity transport code, allowing to determine the transport parameters: diffusion coefficient and convective velocity. The transport coefficients were found close to those deduced in previous experiments through the introduction of Ni and Ne, confirming the existence of an external velocity barrier also for light impurities.

日本語訳

RFX-mod逆磁場ピンチの多重ヘリシティ(MH)および閉じ込め改善型準単一ヘリシティ(QSH)磁気配位における、注入不純物の輸送を調査した。不純物は、炭素(MHおよびQSH)およびリチウム(MH)の室温ペレットの注入を通じて導入された。実験的分光測定(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)のシミュレーションは、1次元衝突放射不純物輸送コードを用いて実施され、輸送パラメータ(拡散係数および対流速度)を決定することができた。輸送係数は、NiおよびNeの導入を通じて行われた以前の実験から導出された値に近いことが判明し、軽不純物に対しても外部速度障壁が存在することが確認された。

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ImpurityReversed field pinchRFXPellet injectionImpurity transport
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