Finding the Elusive E × B Staircase in Magnetized Plasmas

Guilhem Dif-Pradalier 1 G Hornung 2 Philippe Ghendrih 1 Yanick Sarazin 1 F Clairet 1 L Vermare 3 P Diamond J Abiteboul 4 T Cartier-Michaud 1 C Ehrlacher 1 Daniel Estève 1 Xavier Garbet 1 Virginie Grandgirard 1 O Gürcan 3 P Hennequin 3 Y Kosuga 5 Guillaume Latu 1 P Maget 1 Paul Morel 3 C Norscini 1 R Sabot 1 A Storelli 3
1 IRFM - Institut de Recherche sur la Fusion par confinement Magnétique
2 UGENT - Ghent University [Belgium]
3 LPP - Laboratoire de Physique des Plasmas
4 IPP - Max-Planck-Institut für Plasmaphysik [Garching]
5 Kyushu University [Fukuoka]
Abstract : Turbulence in hot magnetized plasmas is shown to generate permeable localized transport barriers that globally organize into the so-called "ExB staircase" [G. Dif-Pradalier et al., Phys. Rev. E, 82, 025401(R) (2010)]. Its domain of existence and dependence with key plasma parameters is discussed theoretically. Based on these predictions, staircases are observed experimentally in the Tore Supra tokamak by means of high-resolution fast-sweeping X-mode reflectometry. This observation strongly emphasizes the critical role of mesoscale self-organization in plasma turbulence and may have far-reaching consequences for turbulent transport models and their validation.
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Guilhem Dif-Pradalier, G Hornung, Philippe Ghendrih, Yanick Sarazin, F Clairet, et al.. Finding the Elusive E × B Staircase in Magnetized Plasmas. Physical Review Letters, American Physical Society, 2015, 114, pp.085004 ⟨10.1103/PhysRevLett.114.085004⟩. ⟨cea-01468384⟩

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