The radial localization of the transition from low to high confinement mode in the ASDEX Upgrade tokamak

A novel experimental method is applied to localize the initial suppression of turbulence, in the form of density fluctuations, at the transition from the low (L-) to the high (H-) confinement mode in toroidal magnetic fusion plasmas. The high radial and temporal resolution, combined with the unprece...

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Bibliographic Details
Published in:Plasma physics and controlled fusion 2024-02, Vol.66 (2), p.25011
Main Authors: Cavedon, M, Happel, T, Hennequin, P, Dux, R, Höfler, K, Plank, U, Pütterich, T, Stroth, U, Viezzer, E, Wolfrum, E
Format: Article
Language:English
Subjects:
L-H transition
Physics
shear
shear layer
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Summary:A novel experimental method is applied to localize the initial suppression of turbulence, in the form of density fluctuations, at the transition from the low (L-) to the high (H-) confinement mode in toroidal magnetic fusion plasmas. The high radial and temporal resolution, combined with the unprecedented statistical significance, provided the awaited information on a possible dominant E × B shear layer in L-H transition physics. We show, for the first time, that the H-mode turbulence suppression is initiated at the inner E × B shear layer in the ASDEX Upgrade tokamak possibly shedding light on the causality behind the L-H transition process.
ISSN:0741-3335
1361-6587
DOI:10.1088/1361-6587/ad1ae3