Theoretical description of heavy impurity transport and its application to the modelling of tungsten in JET and ASDEX upgrade

被引：109

作者：

Casson, F. J. ^{[1
,2
]}

Angioni, C. ^{[2
]}

Belli, E. A. ^{[3
]}

Bilato, R. ^{[2
]}

Mantica, P. ^{[4
]}

Odstrcil, T. ^{[2
]}

Puetterich, T. ^{[2
]}

Valisa, M. ^{[5
]}

Garzotti, L. ^{[1
]}

Giroud, C. ^{[1
]}

Hobirk, J. ^{[2
]}

Maggi, C. F. ^{[2
]}

Mlynar, J. ^{[6
]}

Reinke, M. L. ^{[7
]}

机构：

[1] CCFE, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

[2] Max Planck Inst Plasma Phys, D-85748 Garching, Germany

[3] Gen Atom Co, San Diego, CA 92186 USA

[4] CNR, ENEA, Ist Fis Plasma, I-20133 Milan, Italy

[5] Consorzio RFX CNR ENEA, I-35127 Padua, Italy

[6] IPP CR, Inst Plasma Phys AS CR, Prague, Czech Republic

[7] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2015年 / 57卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

tokamak; impurity; transport; neoclassical; validation; modelling; tungsten; ROTATING TOKAMAK PLASMA; NEOCLASSICAL TRANSPORT; DENSITY; ASYMMETRIES; TOMOGRAPHY;

D O I：

10.1088/0741-3335/57/1/014031

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：

The effects of poloidal asymmetries and heated minority species are shown to be necessary to accurately describe heavy impurity transport in present experiments in JET and ASDEX Upgrade. Plasma rotation, or any small background electrostatic field in the plasma, such as that generated by anisotropic external heating can generate strong poloidal density variation of heavy impurities. These asymmetries have recently been added to numerical tools describing both neoclassical and turbulent transport and can increase neoclassical tungsten transport by an order of magnitude. Modelling predictions of the steady-state two-dimensional tungsten impurity distribution are compared with tomography from soft x-ray diagnostics. The modelling identifies neoclassical transport enhanced by poloidal asymmetries as the dominant mechanism responsible for tungsten accumulation in the central core of the plasma. Depending on the bulk plasma profiles, turbulent diffusion and neoclassical temperature screening can prevent accumulation. Externally heated minority species can significantly enhance temperature screening in ICRH plasmas.

引用

页数：10

共 55 条

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