3D simulations of turbulent mixing in a simplified slab-divertor geometry

被引：7

作者：

Walkden, N. R. ^{[1
]}

Riva, F. ^{[1
]}

Dudson, B. D. ^{[2
]}

Ham, C. ^{[1
]}

Militello, F. ^{[1
]}

Moulton, D. ^{[1
]}

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

Omotani, J. T. ^{[1
]}

机构：

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

[2] Univ York, York Plasma Inst, York YO10 5DD, N Yorkshire, England

来源：

NUCLEAR MATERIALS AND ENERGY | 2019年 / 18卷

基金：

英国工程与自然科学研究理事会;

关键词：

TRANSPORT;

D O I：

10.1016/j.nme.2018.12.005

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Three-dimensional simulations of plasma turbulence have been run using the STORM module of BOUT + + in a simple slab geometry aimed at representing a single, isolated tokamak divertor leg. Turbulence is driven primarily by the Kelvin-Helmholtz mechanism due to the sheared ExB flow that forms around the separatrix due to strong radial gradients in the sheath potential which arise from strong radial gradients in the electron temperature. The turbulence forms a mixing layer around the separatrix which spreads heat and particles into the private-flux region. The resulting spread of the electron heat flux is within the experimental range measured on MAST. An effective thermal transport coefficient which is approximately 10% of the Bohm value is measured from the simulations. When a transport coefficient of this magnitude is used in a diffusive axisymmetric simulation, the time-averaged radial profiles share similar features to the full turbulence simulation.

引用

页码：111 / 117

页数：7

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