Reversal of Impurity Pinch Velocity in Tokamaks Plasma with a Reversed Magnetic Shear Configuration

被引：33

作者：

Futatani, S. ^{[1
]}

Garbet, X. ^{[2
]}

Benkadda, S. ^{[1
]}

Dubuit, N. ^{[1
]}

机构：

[1] Univ Aix Marseille 1, CNRS, Int Inst Fus Sci, Ctr St Jerome, Case 321, F-13397 Marseille 20, France

[2] CEA Cadarache, CEA Fus Controlee, EURATOM Assoc, F-13108 St Paul Les Durance, France

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 01期

关键词：

PARTICLE-TRANSPORT; ANOMALOUS PINCH; MODE; SIMULATIONS; TURBULENCE; PEAKING;

D O I：

10.1103/PhysRevLett.104.015003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Impurity transport in tokamak core plasmas is investigated with a three-dimensional fluid global code. It is shown that, in the presence of an internal transport barrier (ITB) created by a reversed magnetic shear configuration, one can obtain a reversal of the impurity pinch velocity which can change from the inward direction to the outward direction. This scenario is favorable for expelling impurities from the central region and decontaminating the core plasma. The mechanism of pinch reversal is attributed to a change of direction of the curvature pinch and to a modification of the dominant underlying instability caused by a change of the gradient of the ion temperature and consequently of the ITB formation.

引用

页数：4