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

Jukka Heikkinen, Timo Kiviniemi, A. Peeters

Research output: Contribution to journalArticleScientificpeer-review

43 Citations (Scopus)

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
Number of pages4
JournalPhysical Review Letters
Volume84
Issue number3
DOIs
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed

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turbulence
retarding
shear
scaling
thresholds
shear flow
orbits
electric fields
ions
simulation
temperature

Cite this

Heikkinen, Jukka ; Kiviniemi, Timo ; Peeters, A. / Neoclassical radial current balance in Tokamaks and transition to the H mode. In: Physical Review Letters. 2000 ; Vol. 84, No. 3. pp. 487 - 490.
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Neoclassical radial current balance in Tokamaks and transition to the H mode. / Heikkinen, Jukka; Kiviniemi, Timo; Peeters, A.

In: Physical Review Letters, Vol. 84, No. 3, 2000, p. 487 - 490.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Peeters, A.

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N2 - 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.

AB - 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.

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