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Pellet injection experiments on the TFR tokamak

TFR Group1987年被引用 62Nuclear FusionIF 3出版社

Single pellet injection experiments have been carried out on TFR in Ohmic conditions, aiming at an improvement of the experimental knowledge of ablation physical processes and also at a better description of the heat and matter transport during and after pellet evaporation. Ablation clouds have been photographed, providing experimental penetration depths in rough agreement with the neutral shielding model. Observation of striations in the cloud has led to an experimental determination of the safety factor profile. The plasma parameters in the ablation cloud have been determined spectroscopically. Fast heat transport has been evidenced during pellet evaporation (∼ 100 μs), which exhibits some features of minor or major disruptions (appearance of an m = 1, n = 1 island on the q = 1 surface, bursts of density fluctuations, comparable heat diffusivity, etc.). Matter transport takes place on a larger time-scale (∼10 ms). This long temporal relaxation is well accounted for by the MAKOKOT 1-D transport code with the same dependence of the transport coefficients on the plasma parameters before and after pellet injection. Heat and matter transports are affected by the presence of the m = 1, n = 1 island on the q = 1 surface.

日本語訳

単一ペレット注入実験は、オーミック条件下でTFR装置において実施され、アブレーション物理過程に関する実験的知識の向上と、ペレット蒸発中および蒸発後の熱・物質輸送のより良い記述を目的とした。アブレーション雲の写真撮影が行われ、実験による浸透深さは中性シールドモデルと概ね一致した。雲内のストリーションの観測により、安全係数分布の実験的決定が可能となった。アブレーション雲内のプラズマパラメータは分光学的に決定された。ペレット蒸発中(約100μs)に高速熱輸送が確認され、これは小規模または大規模ディスラプションの特徴(q=1面上でのm=1、n=1アイランドの出現、密度バースト、同等の熱拡散率など)の一部を示す。物質輸送はより大きな時間スケール(約10ms)で生じる。この長い時間緩和は、MAKOKOT 1次元輸送コードによって、ペレット注入前後の輸送係数のプラズマパラメータへの同一の依存性を用いて良好に再現される。熱・物質輸送は、q=1面上のm=1、n=1アイランドの存在によって影響を受ける。

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Pellet injectionTFR
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