L-H transport barrier formation: Self-consistent simulation and comparison with ASDEX upgrade experiments

Timo Kiviniemi, Taina Kurki-Suonio, Seppo Sipilä, Jukka Heikkinen, A.G. Peeters

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Monte Carlo ion simulation based on neoclassical radial current balance near edge in a divertor tokamak geometry gives a stationary sheared E~ ×B~ flow. The neoclassical radial electric field Er shows no bifurcation in contrast with earlier orbit loss models, but the shear in Er reaches values at which a transition to enhanced confinement has been observed. Also, MHD turbulence analysis shows that a smooth transition can occur through the neoclassical E~ × B~ flow shear suppression. The parameter scaling of threshold temperature for suppression of turbulence agrees with the H-mode threshold scaling in ASDEX Upgrade.
Original languageEnglish
Pages (from-to)81-92
JournalCzechoslovak Journal of Physics
Volume49
Issue number12
Publication statusPublished - 1999
MoE publication typeA1 Journal article-refereed

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