Quantitative comparison of impurity transport in turbulence reduced and enhanced scenarios at Wendelstein 7-X

被引：3

作者：

Alcuson, J. A. ^{[1
,2
]}

Wegner, Th. ^{[1
]}

Dinklage, A. ^{[1
]}

Langenberg, A. ^{[1
]}

Bahner, J. -P. ^{[3
]}

Buttenschoen, B. ^{[1
]}

Edlund, E. M. ^{[4
]}

Fuchert, G. ^{[1
]}

Garcia-Regana, J. M. ^{[5
]}

Grulke, O. ^{[1
,6
]}

Huang, Z. ^{[7
]}

Porkolab, M. ^{[3
]}

Stechow, A. V. ^{[1
]}

Xanthopoulos, P. ^{[1
]}

Zocco, A. ^{[1
]}

机构：

[1] Max Planck Inst Plasma Phys, D-17491 Greifswald, Germany

[2] Univ Cordoba, Lab Innovac Plasmas, Cordoba 14071, Spain

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

[4] SUNY Coll Cortland, Cortland, NY 13045 USA

[5] CIEMAT, Lab Nacl Fus, Ave Complutense, Madrid 28040, Spain

[6] Tech Univ Denmark, DK-2800 Lyngby, Denmark

[7] UKAEA, Culham Ctr Fus Energy, Culham Sci Ctr, Abingdon OX14 3DB, Oxon, England

来源：

NUCLEAR FUSION | 2023年 / 63卷 / 09期

关键词：

turbulent transport; impurity transport; stellarator; plasma; DRIVEN; PLASMA; SPECTROMETER; MODES;

D O I：

10.1088/1741-4326/aceb76

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：

We assess the turbulent particle transport being responsible for the limitation of the confinement and, thus, the overall performance of the neoclassically optimized stellarator Wendelstein 7-X. The radial particle transport is experimentally inferred from the evaluation of impurity injection into turbulence reduced and enhanced plasma scenarios revealing a completely different confinement behavior. The impact of the density gradient on the turbulent ion transport is theoretically estimated using large-scale non-linear gyro-kinetic simulations enabling, for the first time in Wendelstein 7-X, a quantitative comparison to the experimentally assessed impurity transport properties. We demonstrate that impurity transport in most of the Wendelstein 7-X discharges, up to now impossible to cover only with neoclassical estimations, is dominated by turbulence and can be modelled via gyro-kinetic simulations.

引用

页数：8

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