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Confinement degradation by Alfvén-eigenmode induced fast-ion transport in steady-state scenario discharges

W W Heidbrink, J R Ferron, C T Holcomb, M A Van Zeeland, Xi Chen, C M Collins, A Garofalo, X Gong, B A Grierson, M Podestà2014年Plasma Physics and Controlled FusionIF 2.2出版社

Analysis of neutron and fast-ion Dα data from the DIII-D tokamak shows that Alfvén eigenmode activity degrades fast-ion confinement in many high βN, high qmin, steady-state scenario discharges. (βN is the normalized plasma pressure and qmin is the minimum value of the plasma safety factor.) Fast-ion diagnostics that are sensitive to the co-passing population exhibit the largest reduction relative to classical predictions. The increased fast-ion transport in discharges with strong AE activity accounts for the previously observed reduction in global confinement with increasing qmin; however, not all high qmin discharges show appreciable degradation. Two relatively simple empirical quantities provide convenient monitors of these effects: (1) an 'AE amplitude' signal based on interferometer measurements and (2) the ratio of the neutron rate to a zero-dimensional classical prediction.

日本語訳

DIII-Dトカマクからの中性子および高速イオンDαデータの解析により、多くの高βN・高qmin定常シナリオ放電において、アルヴェン固有モード活動が高速イオン閉じ込めを劣化させることが示された。(βNは規格化プラズマ圧力、qminは最小安全係数である。)共通過度分布に敏感な高速イオン診断は、古典的予測に対して最も大きな減少を示す。強いAE活動を伴う放電における高速イオン輸送の増大は、qminの増加に伴う全体的な閉じ込めの低下として以前観測された現象を説明するものである。しかし、すべての高qmin放電が顕著な劣化を示すわけではない。2つの比較的単純な経験的量がこれらの効果の簡便なモニターを提供する:(1)干渉計測定に基づく「AE振幅」シグナル、および(2)中性子率とゼロ次元古典的予測との比である。

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diii-d中精度(概要文一致)

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Fusion Advanced Studies TorusAlfvén waveEnergetic ionSteady stateIon transport
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