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Partial detachment of high power discharges in ASDEX Upgrade

A. Kallenbach, M. Bernert, M. Beurskens, L. Casali, M. Dunne, T. Eich, L. Giannone, A. Herrmann, M. Maraschek, S. Potzel2015年被引用 170Nuclear FusionIF 3出版社

Detachment of high power discharges is obtained in ASDEX Upgrade by simultaneous feedback control of core radiation and divertor radiation or thermoelectric currents by the injection of radiating impurities. So far 2/3 of the ITER normalized heat flux Psep/R = 15 MW m−1 has been obtained in ASDEX Upgrade under partially detached conditions with a peak target heat flux well below 10 MW m−2. When the detachment is further pronounced towards lower peak heat flux at the target, substantial changes in edge localized mode (ELM) behaviour, density and radiation distribution occur. The time-averaged peak heat flux at both divertor targets can be reduced below 2 MW m−2, which offers an attractive DEMO divertor scenario with potential for simpler and cheaper technical solutions. Generally, pronounced detachment leads to a pedestal and core density rise by about 20–40%, moderate (<20%) confinement degradation and a reduction of ELM size. For AUG conditions, some operational challenges occur, like the density cut-off limit for X-2 electron cyclotron resonance heating, which is used for central tungsten control.

日本語訳

高パワー放電のデタッチメントは、ASDEX Upgradeにおいて、放射不純物の注入によるコア放射とダイバータ放射または熱電電流の同時フィードバック制御によって達成される。これまでに、ITER規格化熱流束Psep/R = 15 MW m⁻¹の2/3が、ピークターゲット熱流束が10 MW m⁻²を十分に下回る部分デタッチ条件下でASDEX Upgradeにおいて達成されている。デタッチメントがピークターゲット熱流束の低下に向けてさらに進行すると、ELM(周辺局在モード)挙動、密度、および放射分布に substantial な変化が生じる。両ダイバータターゲットにおける時間平均ピーク熱流束は2 MW m⁻²未満に低減可能であり、これは、より単純で安価な技術的解決策の可能性を備えた魅力的なDEMOダイバータシナリオを提供する。一般に、顕著なデタッチメントは、ペデスタル密度およびコア密度の約20〜40%の上昇、閉じ込めの中等度(20%未満)の劣化、およびELMサイズの低減をもたらす。AUG条件では、中央タングステン制御に使用されるX-2電子サイクロトロン共鳴加熱の密度カットオフ限界など、いくつかの運転上の課題が発生する。

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