Pedestal andErprofile evolution during an edge localized mode cycle at ASDEX Upgrade

• DOI: 10.1088/1361-6587/aa7ad0
• Publication Date: 2017-06-21T12:16:01Z
• Authors: M Cavedon; T Pütterich; E Viezzer; F M Laggner; A Burckhart; M Dunne; R Fischer; A Lebschy; F Mink; U Stroth; M Willensdorfer; E Wolfrum
• Keywords: Pedestal; ASDEX Upgrade; Electron temperature; Pressure gradient

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