Artículo
Pedestal and Er profile evolution during an edge localized mode cycle at ASDEX Upgrade
Autor/es | Cavedon, M.
Pütterich, T. Viezzer, Eleonora Laggner, F. M. Burckhart, A. Dunne, M. G. Fischer, R. Lebschy, A. Mink, F. Stroth, U. Willensdorfer, M. Wolfrum, E. |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Fecha de publicación | 2017 |
Fecha de depósito | 2018-09-17 |
Publicado en |
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Resumen | The upgrade of the edge charge exchange recombination spectroscopy diagnostic at ASDEX
Upgrade has enabled highly spatially resolved me
asurements of the impurity ion dynamics during an
edge-localized mode cycle
(
E ... The upgrade of the edge charge exchange recombination spectroscopy diagnostic at ASDEX Upgrade has enabled highly spatially resolved me asurements of the impurity ion dynamics during an edge-localized mode cycle ( ELM ) with unprecedented temp oral resolution, i.e. 65 μ s. The increase of transport during an ELM induces a relaxation of the ion, electron edge gradients in impurity density and fl ows. Detailed characterization of the recovery of the edge temperature gradients reveals a difference in the ion and electron channe l: the maximum ion temperature gradient T i is re-established on similar timescales as n e , which is faster than the recovery of T e .Afterthe clamping of the maximum gradient, T i and T e at the pedestal top continue to rise up to the next ELM while n e stays constant which means that the temperatur e pedestal and the resu lting pedestal pressure widen until the next ELM. The edge radial electric fi eld E r at the ELM crash is found to reduce to typical L-mode values and its ma ximum recovers to its pre-ELM conditions on a similar time scale as for n e and T i . Within the uncertainties, the measurements of E r align with their neoclassical predictions E r,neo for most of the ELM cycle, thus indicating that E r is dominated by collisional processes. However, between 2 and 4 ms af ter the ELM crash, other contributions to E B ́ fl ow, e.g. zonal fl ows or ion orbit effects, could not be excluded within the uncertainties. |
Agencias financiadoras | European Commission (EC) |
Identificador del proyecto | EUROfusion 633053 |
Cita | Cavedon, M., Pütterich, T., Viezzer, E., Laggner, F.M., Burckhart, A., Dunne, M.G.,...,Wolfrum, E. (2017). Pedestal and Er profile evolution during an edge localized mode cycle at ASDEX Upgrade. Plasma Physics and Controlled Fusion, 59, 105007 (8pp). https://doi.org/10.1088/1361-6587/aa7ad0. |
Ficheros | Tamaño | Formato | Ver | Descripción |
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Plasma2017_Cavedon.pdf | 1.437Mb | [PDF] | Ver/ | Pre-print |