Bursty transport in tokamak turbulence: role of zonal flows and internal transport barriers

Benkadda, S., Beyer, P., Bian, N.H., Figarella, C., Garcia, O., Garbet, X., Ghendrih, P., Sarazin, Y. and Diamond, P.H. (2002) Bursty transport in tokamak turbulence: role of zonal flows and internal transport barriers. Nuclear Fusion, 41(8), pp. 995-1001. (doi:10.1088/0029-5515/41/8/304)

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Publisher's URL: http://dx.doi.org/10.1088/0029-5515/41/8/304

Abstract

Large scale transport events are studied using two different 3-D simulation codes related to resistive ballooning and ion temperature gradient turbulence. The turbulence is driven by a constant incoming flux. In the case of resistive ballooning simulations, the underlying structures are found to be radially elongated on the low field side and distorted by magnetic shear in the parallel direction (streamers). The non-linear character of these structures is emphasized. Bursty transport is investigated in the presence of zonal flows and internal transport barriers generated either by a strong shear flow or with a magnetic shear reversal. In deriving a low dimensional model that captures the main features of bursty transport dynamics, it is found that E × B shear flow is necessary to trigger the bursts.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Bian, Dr Nicolas Horace
Authors: Benkadda, S., Beyer, P., Bian, N.H., Figarella, C., Garcia, O., Garbet, X., Ghendrih, P., Sarazin, Y., and Diamond, P.H.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Nuclear Fusion
ISSN:0029-5515
ISSN (Online):1741-4326

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