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Investigation of sustainable high-β scenarios in the JT-60SA C-wall

M. Romanelli, P. Aresta-Belo, G. Corrigan, L. Garzotti, D. Harting, F. Koechl, S. Saarelma, S. Wiesen, M. Wischmeier, R. Zagórski2017年被引用 4Nuclear FusionIF 3出版社

One of the main goals of the JT-60SA C-wall is the study of steady-state plasma scenarios characterised by high fractions of bootstrap current, low flux consumption and sustainable divertor heat-loads (advanced scenarios). The feasibility of the above scenarios will depend on the demonstration of simultaneous control of core/SOL/divertor conditions to achieve large core pressure/pressure gradients, and preventing impurity accumulation while ensuring an acceptable power load on the divertor targets. In this paper two scenarios at 2.3 MA, 1.7 T with 30 MW and 17 MW of NBI heating, respectively, and 7 MW of ECRH power were simulated with the integrated suite of core/SOL/divertor codes JINTRAC. Various fuelling rates/locations were investigated and it was found that high values of beta, and acceptable levels of power load on the divertor outer-target, can be achieved without impurity seeding for separatrix densities above 2  ×  1019 m−3 and in conditions of partial divertor detachment. The 0D plasma parameters of the above reduced-power advanced scenario are discussed along with comparison against the reference values of the highest beta scenario in the JT-60SA research plan.

日本語訳

JT-60SA C-wallの主な目標の一つは、高割合のブートストラップ電流、低いフラックス消費、および持続可能なダイバータ熱負荷を特徴とする定常プラズマシナリオ(先進シナリオ)の研究である。上記シナリオの実現可能性は、大きなコア圧力・圧力勾配を達成し、ダイバータターゲット上の許容可能な熱負荷を確保しながら不純物の蓄積を防ぐための、コア/SOL/ダイバータ条件の同時制御の実証に依存する。本論文では、それぞれ30 MWおよび17 MWのNBI加熱と7 MWのECRH加熱を伴う2.3 MA、1.7 Tの2つのシナリオを、統合コア/SOL/ダイバータコードJINTRINを用いてシミュレーションした。様々な燃料供給率・供給位置を調査し、セパラトリクス密度が2×10¹⁹ m⁻³以上で部分的なダイバータ非接触状態にある場合、不純物シーディングなしで高いベータ値と許容可能なダイバータ外側ターゲット熱負荷が達成可能であることを見出した。上記の低出力先進シナリオの0次元プラズマパラメータを、JT-60SA研究計画における最高ベータシナリオの参照値と比較して考察する。

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