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Impurity transport in the Advanced toroidal facility

L.D. Horton, R.C. Isler, H.C. Howe, E.C. Crume, D.C. Giles1992年被引用 1Nuclear FusionIF 3出版社

The spectral line emissions from impurities injected using the laser ablation technique have been modelled in order to deduce impurity transport coefficients in the Advanced Toroidal Facility (ATF). The transport is found to be mainly diffusive, with little or no convective component. To reproduce the observed line emission it is necessary to postulate a radially dependent diffusion coefficient. For plasmas heated by electron cyclotron frequency waves the impurity transport is best fitted with a diffusion coefficient of 1000 cm2/s in the centre, increasing to 5000 cm2/s at the plasma edge. The global impurity particle confinement time for these plasmas is 65 ms and is considerably larger than the corresponding energy confinement time. Plasmas heated by high energy neutral particle beams display different impurity transport, with the best fit being a diffusion coefficient that is peaked on axis (5000 cm2/s) and that decreases towards larger minor radii (500 cm2/s at the plasma boundary). These transport coefficients have been successfully used to simulate the evolution of intrinsic impurities as well as laser ablated impurities in ATF

日本語訳

レーザーアブレーション法を用いて注入された不純物からのスペクトル線放射をモデル化し、先進トロイダル装置(ATF)における不純物輸送係数を推定した。輸送は主に拡散的であり、対流成分はほとんどまたは全くないことが分かった。観測された線放射を再現するには、半径依存性の拡散係数を仮定する必要がある。電子サイクロトロン周波数波で加熱されたプラズマでは、不純物輸送は中心部で1000 cm2/s、プラズマ端に向かって5000 cm2/sに増加する拡散係数で最もよく適合する。これらのプラズマにおける全不純物粒子閉じ込め時間は65 msであり、対応するエネルギー閉じ込め時間よりもかなり長い。高エネルギー中性粒子ビームで加熱されたプラズマは異なる不純物輸送を示し、最も良い適合は軸上でピークを持つ(5000 cm2/s)拡散係数であり、小半径が大きくなるにつれて減少する(プラズマ境界で500 cm2/s)。これらの輸送係数は、ATFにおける内部不純物およびレーザーアブレーション不純物の進化をシミュレーションするために首尾よく使用されている。

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