Dependence on plasma shape and plasma fueling for small edge-localized mode regimes in TCV and ASDEX Upgrade

TitleDependence on plasma shape and plasma fueling for small edge-localized mode regimes in TCV and ASDEX Upgrade
Publication TypeJournal Article
Year of Publication2019
AuthorsB. Labit, T. Eich, G. Harrer, E. Wolfrum, M. Bernert, M.G Dunne, L. Frassinetti, G.MD Hogeweij, A. Perek, B. Vanovac, P. Hennequin, R. Maurizio, A. Merle, EUROfusion MST1 Team, H. Meyer, S. Saarelma, H. Sheikh
JournalNuclear Fusion
Volume59
Issue8
Pagination086020
Abstract

Within the EUROfusion MST1 work package, a series of experiments has been conducted on AUG and TCV devices to disentangle the role of plasma fueling and plasma shape for the onset of small ELM regimes. On both devices, small ELM regimes with high confinement are achieved if and only if two conditions are fulfilled at the same time. Firstly, the plasma density at the separatrix must be large enough (n e,sep / nG about 0.3), leading to a pressure profile flattening at the separatrix, which stabilizes type-I ELMs. Secondly, the magnetic configuration has to be close to a double null (DN), leading to a reduction of the magnetic shear in the extreme vicinity of the separatrix. As a consequence, its stabilizing effect on ballooning modes is weakened.

DOI10.1088/1741-4326/ab2211
Division

FP

Department

PEPD

PID

aa2909729a2061f7cf725b5ee78cd3d1

Alternate TitleNucl. Fusion

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