Radio Frequency Induced and Neoclassical Asymmetries and their Effects on Turbulent Impurity Transport in a Tokamak

被引：4

作者：

Pusztai, I. ^{[1
,2
,3
]}

Landreman, M. ^{[4
]}

Mollen, A. ^{[1
,2
]}

Kazakov, Ye. O. ^{[5
]}

Fulop, T. ^{[1
,2
]}

机构：

[1] Chalmers Univ Technol, SE-41296 Gothenburg, Sweden

[2] Euratom VR Assoc, SE-41296 Gothenburg, Sweden

[3] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA

[4] Univ Maryland, College Pk, MD 20742 USA

[5] Assoc EURATOM Belgian State, TEC Partner, ERM KMS, Plasma Phys Lab, BE-1000 Brussels, Belgium

来源：

CONTRIBUTIONS TO PLASMA PHYSICS | 2014年 / 54卷 / 4-6期

关键词：

Tokamak; impurity transport; poloidal asymmetries; gyrokinetic; neoclassical; peaking factor; PLASMA;

D O I：

10.1002/ctpp.201410012

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：

Poloidal asymmetries in the impurity density can be generated by radio frequency heating in the core and by neoclassical effects in the edge of tokamak plasmas. In a pedestal case study, using global neoclassical simulations we find that finite orbit width effects can generate significant poloidal variation in the electrostatic potential, which varies on a small radial scale. Gyrokinetic modeling shows that these poloidal asymmetries can be strong enough to significantly modify turbulent impurity peaking. In the pedestal the E x B drift in the radial electric field can give a larger contribution to the poloidal motion of impurities than that of their parallel streaming. Under such circumstances we find that up-down asymmetries can also affect impurity peaking. (C) 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：534 / 542

页数：9

共 31 条

[1] Analytic formulae for centrifugal effects on turbulent transport of trace impurities in tokamak plasmas [J].