Neoclassical radial current balance in Tokamaks and transition to the H mode

Jukka Heikkinen, Timo Kiviniemi, A. Peeters

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Abstract

Monte Carlo ion simulation based on neoclassical radial current balance in a divertor tokamak 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 strong turbulence shear suppression agrees with the H-mode threshold scaling in ASDEX Upgrade.
Original languageEnglish
Pages (from-to)487-490
JournalPhysical Review Letters
Volume84
Issue number3
DOIs
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed

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