Global simulations of ion turbulence with magnetic shear reversal

被引：145

作者：

Garbet, X ^{[1
]}

Bourdelle, C

Hoang, GT

Maget, P

Benkadda, S

Beyer, P

Figarella, C

Voitsekovitch, I

Agullo, O

Bian, N

机构：

[1] CEA Cadarache, CEA Fus Controlee, EURATOM Assoc, Cadarache, France

[2] Univ Aix Marseille 1, Ctr Univ St Jerome, Lab PIIM, CNRS,UMR 6633, F-13397 Marseille 20, France

来源：

PHYSICS OF PLASMAS | 2001年 / 8卷 / 06期

关键词：

D O I：

10.1063/1.1367320

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：

This paper presents the results of three-dimensional fluid global simulations of electrostatic ion turbulence in tokamaks with reversed magnetic shear. It is found that a transport barrier appears at the location of magnetic shear reversal. This is due to a rarefaction of resonant surfaces in this region. For the same reason, the barrier is more pronounced when the minimum of the safety factor is a simple rational number. The barrier is broadened by velocity shear effects. It is also found that large-scale transport events hardly cross a transport barrier. Finally, a significant amount of toroidal rotation is generated by the turbulence. This rotation changes its sign at the position of magnetic shear reversal, as expected from a quasi-linear estimate of the Reynolds stress tensor. (C) 2001 American Institute of Physics.

引用

页码：2793 / 2803

页数：11

共 55 条

[1] Gyrofluid simulations of turbulence suppression in reversed-shear experiments on the tokamak fusion test reactor [J].

Beer, MA ;

Hammett, GW ;

Rewoldt, G ;

Synakowski, EJ ;

Zarnstorff, MC ;

Dorland, W .

PHYSICS OF PLASMAS, 1997, 4 (05) :1792-1799

[2] ANOMALOUS ION THERMAL-DIFFUSION FROM ETA-I MODES [J].

BEKLEMISHEV, AD ;

HORTON, W .

PHYSICS OF FLUIDS B-PLASMA PHYSICS, 1992, 4 (07) :2176-2180

[3] Nondiffusive transport in tokamaks: Three-dimensional structure of bursts and the role of zonal flows [J].

Beyer, P ;

Benkadda, S ;

Garbet, X ;

Diamond, PH .

PHYSICAL REVIEW LETTERS, 2000, 85 (23) :4892-4895

[4] INFLUENCE OF SHEARED POLOIDAL ROTATION ON EDGE TURBULENCE [J].

BIGLARI, H ;

DIAMOND, PH ;

TERRY, PW .

PHYSICS OF FLUIDS B-PLASMA PHYSICS, 1990, 2 (01) :1-4

[5]

Braginskii S. I., 1965, REV PLASMA PHYS, V1, P205, DOI DOI 10.1088/0741-3335/47/10/005

[6] Global approach to the spectral problem of microinstabilities in tokamak plasmas using a gyrokinetic model [J].

Brunner, S ;

Fivaz, M ;

Tran, TM ;

Vaclavik, J .

PHYSICS OF PLASMAS, 1998, 5 (11) :3929-3949

[7] Electron thermal transport in RTP: filaments, barriers and bifurcations [J].

Cardozo, NJL ;

Hogeweij, GMD ;

de Baar, M ;

Barth, CJ ;

Beurskens, MNA ;

De Luca, F ;

Donne, AJH ;

Galli, P ;

van Gelder, JFM ;

Gorini, G ;

de Groot, B ;

Jacchia, A ;

Karelse, FA ;

de Kloe, J ;

Kruijt, OG ;

Lok, J ;

Mantica, P ;

van der Meiden, HJ ;

Oomens, AAM ;

Oyevaar, T ;

Pijper, FJ ;

Polman, RW ;

Salzedas, F ;

Schuller, FC ;

Westerhof, E .

PLASMA PHYSICS AND CONTROLLED FUSION, 1997, 39 :B303-B316

[8] A model realization of self-organized criticality for plasma confinement [J].

Carreras, BA ;

Newman, D ;

Lynch, VE ;

Diamond, PH .

PHYSICS OF PLASMAS, 1996, 3 (08) :2903-2911

[9] SHEAR, PERIODICITY, AND PLASMA BALLOONING MODES [J].

CONNOR, JW ;

HASTIE, RJ ;

TAYLOR, JB .

PHYSICAL REVIEW LETTERS, 1978, 40 (06) :396-399

[10] ON THE DYNAMICS OF TURBULENT TRANSPORT NEAR MARGINAL STABILITY [J].

DIAMOND, PH ;

HAHM, TS .

PHYSICS OF PLASMAS, 1995, 2 (10) :3640-3649

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