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Pedestal and Er profile evolution during an edge localized mode cycle at ASDEX Upgrade

M Cavedon, T Pütterich, E Viezzer, F M Laggner, A Burckhart, M Dunne, R Fischer, A Lebschy, F Mink, U Stroth2017年Plasma Physics and Controlled FusionIF 2.2出版社

The upgrade of the edge charge exchange recombination spectroscopy diagnostic at ASDEX Upgrade has enabled highly spatially resolved measurements of the impurity ion dynamics during an edge-localized mode cycle (ELM) with unprecedented temporal resolution, i.e. 65 μs. The increase of transport during an ELM induces a relaxation of the ion, electron edge gradients in impurity density and flows. Detailed characterization of the recovery of the edge temperature gradients reveals a difference in the ion and electron channel: the maximum ion temperature gradient is re-established on similar timescales as , which is faster than the recovery of . After the clamping of the maximum gradient, Ti and Te at the pedestal top continue to rise up to the next ELM while ne stays constant which means that the temperature pedestal and the resulting pedestal pressure widen until the next ELM. The edge radial electric field Er at the ELM crash is found to reduce to typical L-mode values and its maximum recovers to its pre-ELM conditions on a similar time scale as for ne and Ti. Within the uncertainties, the measurements of Er align with their neoclassical predictions for most of the ELM cycle, thus indicating that Er is dominated by collisional processes. However, between 2 and 4 ms after the ELM crash, other contributions to flow, e.g. zonal flows or ion orbit effects, could not be excluded within the uncertainties.

日本語訳

ASDEX Upgradeにおけるエッジ電荷交換再結合分光診断のアップグレードにより、エッジ局在モード(ELM)サイクル中の不純物イオン動力学の高空間分解測定が、前例のない時間分解能、すなわち65μsで可能となった。ELM中の輸送増大は、不純物密度および流れにおけるイオン・電子エッジ勾配の緩和を誘起する。エッジ温度勾配の回復の詳細な特性評価により、イオン・電子チャネル間の差異が明らかになる:最大イオン温度勾配は、電子温度勾配よりも速い同程度の時間スケールで再確立される。最大勾配のクランプ後、ペデスタル頂部におけるTiおよびTeは次のELMまで上昇し続ける一方、neは一定に保たれる。これは、温度ペデスタルおよび結果として生じるペデスタル圧力が次のELMまで拡大し続けることを意味する。ELMクラッシュ時におけるエッジ動径電場Erは典型的なLモード値まで減少することが見出され、その最大値はneおよびTiと同様の時間スケールでELM前の状態に回復する。不確実性の範囲内で、Erの測定値はELMサイクルの大部分において新古典論的予測と一致し、Erが衝突支配過程によって支配されていることを示している。しかしながら、ELMクラッシュ後2〜4msの間は、帯状流やイオン軌道効果などの他の寄与を不確実性の範囲内で排除することはできなかった。

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asdex-upgrade高精度(タイトル一致)

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ASDEXEdge localized modeASDEX UpgradePedestal
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