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Studies of edge localized mode mitigation with new active in-vessel saddle coils in ASDEX Upgrade

W Suttrop, L Barrera, A Herrmann, R M McDermott, T Eich, R Fischer, B Kurzan, P T Lang, A Mlynek, T Pütterich2011年Plasma Physics and Controlled FusionIF 2.2出版社

The ASDEX Upgrade tokamak is currently being enhanced with a set of in-vessel saddle coils for non-axisymmetric perturbations aiming at mitigation or suppression of edge localized modes (ELMs). Results obtained during the first experimental campaign are reported. With n = 2 magnetic perturbations, it is observed that type-I ELMs can be replaced by benign small ELM activity with strongly reduced energy loss from the confined plasma and power load to the divertor. During these phases with ELM mitigation, no density reduction (density 'pump-out') is observed. ELM mitigation has, so far, been observed in plasmas with different shape and different heating mixes and, therefore, different momentum input. The ELM mitigation regime can be accessed with resonant and non-resonant perturbation field configurations. The main threshold requirement appears to be a critical minimum plasma edge density which depends on plasma current. So far it is not possible to distinguish whether this is an edge collisionality threshold or a critical fraction of the Greenwald density limit.

日本語訳

ASDEX Upgradeトカマクは現在、非軸対称摂動のための真空容器内サドルコイル群を備えており、端部局在モード(ELM)の緩和または抑制を目的としている。最初の実験キャンペーンで得られた結果を報告する。n=2の磁気摂動により、タイプI ELMが、閉じ込めプラズマからのエネルギー損失およびダイバータへの熱負荷が大幅に低減された穏やかな小さなELM活動に置き換わることが観測された。ELM緩和中のこれらの位相では、密度低下(密度ポンプアウト)は観測されない。ELM緩和はこれまで、異なる形状および異なる加熱方法(したがって異なる運動量入力)のプラズマにおいて観測されており、共鳴および非共鳴の摂動磁場配位の両方で達成可能である。主な閾値条件は、プラズマ電流に依存する臨界最小密度のようである。これまでのところ、これが端部衝突率の閾値なのか、それともグリーンワルド密度限界の臨界割合なのかを区別することはできない。

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asdex-upgrade高精度(タイトル一致)

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ASDEXEdge localized modeASDEX UpgradeIn-vessel components
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