Tungsten dust impact on ITER-like plasma edge

被引：36
|
作者：
Smirnov, R. D. [1 ]
Krasheninnikov, S. I. [1 ]
Pigarov, A. Yu. [1 ]
Rognlien, T. D. [2 ]
机构：
[1] Univ Calif San Diego, La Jolla, CA 92093 USA
[2] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA
来源：
PHYSICS OF PLASMAS | 2015年 / 22卷 / 01期
关键词：
FUSION DEVICES; SIMULATION; PARTICLES; CODE;
D O I：
10.1063/1.4905704
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 impact of tungsten dust originating from divertor plates on the performance of edge plasma in ITER-like discharge is evaluated using computer modeling with the coupled dust-plasma transport code DUSTT-UEDGE. Different dust injection parameters, including dust size and mass injection rates, are surveyed. It is found that tungsten dust injection with rates as low as a few mg/s can lead to dangerously high tungsten impurity concentrations in the plasma core. Dust injections with rates of a few tens of mg/s are shown to have a significant effect on edge plasma parameters and dynamics in ITER scale tokamaks. The large impact of certain phenomena, such as dust shielding by an ablation cloud and the thermal force on tungsten ions, on dust/impurity transport in edge plasma and consequently on core tungsten contamination level is demonstrated. It is also found that high-Z impurities provided by dust can induce macroscopic self-sustained plasma oscillations in plasma edge leading to large temporal variations of edge plasma parameters and heat load to divertor target plates. (C) 2015 AIP Publishing LLC.
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页数：7
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