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(TH2/2) Bursty Transport in Tokamaks with Internal Transport Barriers

S. Benkadda¹⁾, O. Agullo¹⁾, P. Beyer¹⁾, N. Bian¹⁾, P. H. Diamond³⁾, C. Figarella¹⁾, X. Garbet²⁾, P. Ghendrih²⁾, V. Grandgirard¹⁾, Y. Sarazin^2)
 
1) CNRS - Université de Provence, Marseille, France
²⁾ Association EURATOM - CEA, St. Paul-lez-Durance, France
³⁾ University of California, La Jolla, CA

Abstract.  Large scale transport events are studied using two different three dimensional 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 at the low field side, and distorted by magnetic shear in parallel direction (streamers). The non linear character of these structures is emphasized. Bursty transport is investigated in presence of zonal flows and internal transport barriers generated either by a strong shear flow or with a magnetic shear reversal. Finally, a low dimensional model that captures the main features of bursty transport dynamics is derived.

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