L-H transport barrier formation

Self-consistent simulation and comparison with ASDEX upgrade experiments

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

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
Number of pages12
JournalCzechoslovak Journal of Physics
Volume49
Issue number12
Publication statusPublished - 1999
MoE publication typeA1 Journal article-refereed

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

Cite this

Kiviniemi, T., Heikkinen, J., Kurki-Suonio, T., Peeters, A., & Sipilä, S. (1999). L-H transport barrier formation: Self-consistent simulation and comparison with ASDEX upgrade experiments. Czechoslovak Journal of Physics, 49(12), 81-92.
Kiviniemi, Timo ; Heikkinen, Jukka ; Kurki-Suonio, Taina ; Peeters, A. ; Sipilä, Seppo. / L-H transport barrier formation : Self-consistent simulation and comparison with ASDEX upgrade experiments. In: Czechoslovak Journal of Physics. 1999 ; Vol. 49, No. 12. pp. 81-92.
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title = "L-H transport barrier formation: Self-consistent simulation and comparison with ASDEX upgrade experiments",
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.",
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Kiviniemi, T, Heikkinen, J, Kurki-Suonio, T, Peeters, A & Sipilä, S 1999, 'L-H transport barrier formation: Self-consistent simulation and comparison with ASDEX upgrade experiments', Czechoslovak Journal of Physics, vol. 49, no. 12, pp. 81-92.

L-H transport barrier formation : Self-consistent simulation and comparison with ASDEX upgrade experiments. / Kiviniemi, Timo; Heikkinen, Jukka; Kurki-Suonio, Taina; Peeters, A.; Sipilä, Seppo.

In: Czechoslovak Journal of Physics, Vol. 49, No. 12, 1999, p. 81-92.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - L-H transport barrier formation

T2 - Self-consistent simulation and comparison with ASDEX upgrade experiments

AU - Kiviniemi, Timo

AU - Heikkinen, Jukka

AU - Kurki-Suonio, Taina

AU - Peeters, A.

AU - Sipilä, Seppo

PY - 1999

Y1 - 1999

N2 - 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.

AB - 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.

M3 - Article

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SP - 81

EP - 92

JO - Czechoslovak Journal of Physics

JF - Czechoslovak Journal of Physics

SN - 0011-4626

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