SOLPS simulations of detachment in a snowflake configuration for the future upper divertor in ASDEX Upgrade

被引：21
|
作者：
Pan, O. [1 ,2 ]
Lunt, T. [1 ]
Wischmeier, M. [1 ]
Coster, D. [1 ]
机构：
[1] Max Planck Inst Plasma Phys, D-85748 Garching, Germany
[2] Tech Univ Munich, Phys Dept E28, D-85747 Garching, Germany
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2018年 / 60卷 / 08期
关键词：
SOLPS simulation; snowflake divertor; detachment;
D O I：
10.1088/1361-6587/aac706
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 report on the first SOLPS simulations of a low-field side snowflake minus (LFS SF-) configuration in ASDEX Upgrade (AUG). This configuration will become accessible in AUG after the foreseen hardware modification of its upper divertor. Spatially constant transport coefficients, an input power of 5. MW and a nitrogen seeding rate leading to a radiative fraction of 86% were assumed. This radiative fraction is 9% higher than that for a single null reference with the same transport coefficients, similar upstream parameters and separatrix impurity concentrations. As a consequence the LFS SF-configuration achieves a larger degree of detachment and reduced heat fluxes to the targets. This heat flux mitigation was found to be significantly stronger than that expected from a simple scrape-off layer splitting model.
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页数：6
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