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Investigations on the edge kinetic data in regimes with type-I and mitigated ELMs at ASDEX Upgrade

S.K. Rathgeber, L. Barrera, G. Birkenmeier, R. Fischer, W. Suttrop, the ASDEX Upgrade Team2014年被引用 3Nuclear FusionIF 3出版社

The behaviour of profiles and gradients of electron density, temperature and pressure at the edge of ASDEX Upgrade was studied in regimes with type-I and small edge localized modes (ELMs) of discharges with and without applied magnetic perturbations (MPs). Estimation of the edge kinetic parameters was performed by means of integrated data analysis for joint reconstruction of electron density and temperature profiles via combination of data from different diagnostics. The MP fields for ELM mitigation were produced by 16 in-vessel coils allowing to execute this survey with large variations in poloidal spectrum and resonant component of the error field. With several dedicated discharges the effect of MPs on the edge kinetic data and ELMs was determined in dependence of heating power, gas puff and MP-coil configuration. Small ELMs are dominant—with and without MPs—in regimes with reduced pedestal top electron temperatures and flattened edge electron pressure gradients compared to type-I ELM phases. Furthermore, application of MPs opens an additional small ELM regime in the high temperature range at reduced electron pressure gradient.

日本語訳

抽象: ASDEX Upgradeの周辺部における電子密度、温度、圧力のプロファイルと勾配の挙動を、タイプIおよび小型エッジ局在モード(ELM)を伴う放電において、磁気摂動(MP)の有無にかかわらず研究した。周辺部の運動論的パラメータの推定は、異なる診断装置からのデータを組み合わせた電子密度と温度の統合データ解析により行った。ELM緩和のためのMP場は、16個の容器内コイルによって生成され、これにより、ポロイダルスペクトルと誤差場の共鳴成分を大きく変化させた調査が可能となった。複数の専用放電において、加熱パワー、ガス入射、MPコイル配置に依存する、周辺部の運動論的データとELMに対するMPの影響を決定した。タイプI ELM位相と比較して、ペデスタル頂部の電子温度が低下し、周辺部の電子圧力勾配が平坦化した領域では、MPの有無にかかわらず小型ELMが支配的である。さらに、MPの印加により、電子圧力勾配が低下した高温領域において、追加の小型ELM領域が開かれる。

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asdex-upgrade高精度(タイトル一致)

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ASDEXEdge localized modeASDEX Upgrade
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