Nonlinear dynamics of transport barrier relaxations in tokamak edge plasmas

被引：47

作者：

Beyer, P

Benkadda, S

Fuhr-Chaudier, G

Garbet, X

Ghendrih, P

Sarazin, Y

机构：

[1] Univ Aix Marseille 1, CNRS, LPIIM, Equipe Dynam Syst Complexes, F-13397 Marseille, France

[2] CEA, EURATOM Assoc, DSM, DRFC, F-13108 St Paul Les Durance, France

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.94.105001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A new mechanism for intermittent relaxations of transport barriers is found by using three dimensional fluid turbulence simulations. This mechanism is generic since it only requires a stationary E x B shear flow. It is found here that if the flow shear increases faster than linearly with heating power, the relaxation frequency decreases with power. An analytical study reveals that this nonlinear dynamics is governed by a time delay for effective velocity shear stabilization.

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页数：4

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