Scaling laws of density fluctuations in tokamak plasmas

Pascale Hennequin

doi:10.1016/j.crhy.2006.08.001

Scaling laws of density fluctuations in tokamak plasmas
[Des lois d'échelle de fluctuation de densité dans les plasmas de tokamak]

Pascale Hennequin ¹

¹ Laboratoire de physique et technologie des plasmas, CNRS-École polytechnique, 91128 Palaiseau cedex, France

Comptes Rendus. Physique, Volume 7 (2006) no. 6, pp. 670-678.

Résumé
Abstract

Les mesures de fluctuations apportent des éléments clés pour l'analyse du transport turbulent dans les plasmas de tokamak. Elles complètent les expériences d'analyse de dépendance du confinement avec les paramètres sans dimension par des informations locales et détaillées. Les caractéristiques spatiales et temporelles fournissent notamment des contraintes supplémentaires pour la validation des modèles. Cet article présente les principales observations réalisées sur les tokamaks, principalement en lien avec le rayon de Larmor normalisé $ρ^{*}$ . L'analyse de la dépendance de la structure spatiale est complétée par l'étude des lois d'échelle en nombre d'onde, caractéristique des mécanismes non linéaires de saturation et de dissipation.

Fluctuation measurements provide key elements for turbulent transport analysis. In scaling experiments, they bring complementary local information for validating confinement dependence on nondimensional parameters. The scaling of spatial and temporal characteristics of the fluctuations allows a more detailed comparison with transport models. This article will review the fluctuation observations of the scaling experiments in different tokamaks. They concern mainly scaling laws with the normalised gyroradius $ρ^{*}$ . This article also presents another aspect of fluctuations dependence, the scaling with the wavenumber, which provides information on the nonlinear turbulence mechanisms.

Publié le : 2006-07-01

DOI : 10.1016/j.crhy.2006.08.001

Keywords: Tokamak plasma, Fluctuation measurements, Turbulent transport
Mot clés : Plasma de tokamak, Mesures de fluctuations, Transport turbulent

Affiliations des auteurs :

Pascale Hennequin ¹

¹ Laboratoire de physique et technologie des plasmas, CNRS-École polytechnique, 91128 Palaiseau cedex, France

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     title = {Scaling laws of density fluctuations in tokamak plasmas},
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     pages = {670--678},
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     number = {6},
     year = {2006},
     doi = {10.1016/j.crhy.2006.08.001},
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Pascale Hennequin. Scaling laws of density fluctuations in tokamak plasmas. Comptes Rendus. Physique, Volume 7 (2006) no. 6, pp. 670-678. doi : 10.1016/j.crhy.2006.08.001. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2006.08.001/

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