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Simulations of fast ion wall loads in ASDEX Upgrade in the presence of magnetic perturbations due to ELM-mitigation coils

O. Asunta, S. Äkäslompolo, T. Kurki-Suonio, T. Koskela, S. Sipilä, A. Snicker, M. García-Muñoz, the ASDEX Upgrade team2012年被引用 25Nuclear FusionIF 3出版社

The effect of ASDEX Upgrade (AUG) edge localized mode (ELM)-mitigation coils on fast ion wall loads was studied with the fast particle following Monte Carlo code ASCOT. Neutral beam injected particles were simulated in two AUG discharges both in the presence and in the absence of the magnetic field perturbation induced by the eight newly installed in-vessel coils. In one of the discharges (#26476) beams were applied individually, making it a useful basis for investigating the effect of the coils on different beams. However, no ELM mitigation was observed in #26476, probably due to the low plasma density. Therefore, another discharge (#26895) demonstrating clear ELM mitigation was also studied. The magnetic perturbation due to the in-vessel coils has a significant effect on the fast particle confinement, but only when total magnetic field, Btot, is low. When Btot was high, the perturbation did not increase the losses, but merely resulted in redistribution of the wall power loads. Hence, it seems to be possible to achieve ELM mitigation using in-vessel coils, while still avoiding increased fast ion losses, by simply using a strong Btot. Preliminary comparisons between simulated and experimental fast ion lost detector signals show a reasonable correspondence.

日本語訳

ASDEX Upgrade(AUG)エッジ局在モード(ELM)緩和コイルが高速イオン壁負荷に及ぼす効果を、高速粒子追跡モンテカルロコードASCOTを用いて研究した。中性粒子ビーム入射粒子を、新たに設置された8つの容器内コイルによって誘起される磁場摂動の存在下および非存在下の両方において、2つのAUG放電でシミュレーションした。一方の放電(#26476)ではビームが個別に印加されており、異なるビームに対するコイルの効果を調査するための有用な基盤となった。しかし、#26476ではおそらく低いプラズマ密度のためにELM緩和は観測されなかった。そこで、明確なELM緩和を示した別の放電(#26895)も研究した。容器内コイルによる磁場摂動は高速粒子閉じ込めに有意な効果を及ぼすが、それは全磁場Btotが低い場合に限られた。Btotが高い場合、摂動は損失を増加させず、単に壁電力負荷の再分布をもたらすだけであった。したがって、強いBtotを単純に用いることで、高速イオン損失の増加を回避しつつ、容器内コイルを用いたELM緩和を達成することが可能であるように思われる。シミュレーションと実験的な高速イオン損失検出器信号との予備的な比較は、妥当な対応を示している。

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asdex-upgrade高精度(タイトル一致)

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Fusion Advanced Studies TorusASDEXEdge localized modeASDEX UpgradeEnergetic ionMagnetic perturbation
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