Modification of scrape-off layer transport and turbulence by non-axisymmetric magnetic perturbations in ASDEX Upgrade

A brief survey of the status of ELM mitigation by non-axisymmetric magnetic perturbations in ASDEX Upgrade is presented. ELM mitigation occurs for a wide range of parameters when the peripheral plasma density is above a density threshold. The focus of this paper is on the influence of magnetic pertu...

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Bibliographic Details
Published in:Journal of nuclear materials 2013-07, Vol.438, p.S64-S71
Main Authors: Müller, H.W., Lunt, T., Suttrop, W., Eich, T., Fischer, R., Fuchs, J.C., Herrmann, A., Kočan, M., de Marné, P., Wolfrum, E.
Format: Article
Language:English
Subjects:
Density
Elm
Fluid flow
Perturbation
Splitting
Three dimensional
Transport
Turbulent flow
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Summary:A brief survey of the status of ELM mitigation by non-axisymmetric magnetic perturbations in ASDEX Upgrade is presented. ELM mitigation occurs for a wide range of parameters when the peripheral plasma density is above a density threshold. The focus of this paper is on the influence of magnetic perturbations on scrape-off layer transport and turbulence in L- and H-mode discharges. In low density L-mode strike-line splitting in the divertor as footprint of the 3D magnetic topology with magnetic perturbations is well visible in the heat flux density profiles. At enhanced densities strike-line splitting cannot be observed, transport masks the 3D substructure and the flattening of the density profile around the separatrix causing an enhanced SOL density vanishes. In H-mode strike-line splitting occurs before the ELMs are mitigated. With magnetic perturbation the SOL cross-field transport rises, with ELM mitigation onset intermittency increases.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2013.01.010