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

被引：43

作者：

Benkadda, S ^{[1
]}

Beyer, P

Bian, N

Figarella, C

Garcia, O

Garbet, X

Ghendrih, P

Sarazin, Y

Diamond, PH

机构：

[1] Univ Aix Marseille 1, Ctr St Jerome, CNRS, LPIIM,Equipe Dynam Syst Complexes, Marseille, France

[2] CEA Cadarache, Assoc Euratom CEA Fus, St Paul Les Durance, France

[3] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[4] Univ Tromso, Dept Phys, N-9037 Tromso, Norway

来源：

NUCLEAR FUSION | 2001年 / 41卷 / 08期

关键词：

D O I：

10.1088/0029-5515/41/8/304

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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 Held 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 x B shear flow is necessary to trigger the bursts.

引用

页码：995 / 1001

页数：7

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