Measurements of the edge current evolution and comparison with neoclassical calculations during MAST H-modes using motional Stark effect
Measurements of the edge current evolution and comparison with neoclassical calculations during MAST H-modes using motional Stark effect
复制标题
使用动斯塔克效应测量 MAST H 模式期间的边缘电流演变并与新古典计算进行比较
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
C. Michael
中科院分区：
文献类型：
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作者：
M. de Bock;J. Citrin;S. Saarelma;D. Temple;N. Conway;A. Kirk;H. Meyer;C. Michael
边缘局域模式（elm）存在于大多数托卡马克H-（高约束）模式中，会对聚变反应堆中面向等离子体的组件造成重大损害。控制elm被认为是必要的，因此理解底层物理是至关重要的。elm的稳定性通常用边缘压力梯度∇p和边缘电流密度jϕ来表示。∇p和jφ通常都是从拟合到测量边缘密度和温度曲线的剖面中推导出来的，其中用于计算jφ的新经典理论被使用。本文给出了直接测量磁俯仰角γ - m在边缘的演变和推导出的jφ。这些提供了一种方法来验证由新古典理论推导的jφ，它们开辟了找到一组完整的、自洽的边缘轮廓的可能性，这些边缘轮廓适合密度、温度和γ - m测量，因此可以进行更准确的稳定性分析。
Edge localized modes (ELMs), that are present in most tokamak H- (high confinement) modes, can cause significant damage to plasma facing components in fusion reactors. Controlling ELMs is considered necessary and hence it is vital to understand the underlying physics. The stability of ELMs is typically expressed in terms of the pressure gradient ∇p in the edge and the edge current density jϕ. Both ∇p and jϕ are usually derived from profiles fitted to the measured edge density and temperature profiles, where for the calculation of jϕ neoclassical theory is used. This paper presents direct measurements of the magnetic pitch angle γm evolution in the edge and the derived jϕ. These provide a method to validate the jϕ as derived with neoclassical theory and they open up the possibility to find a complete, self-consistent set of edge profiles, that fit density, temperature and γm measurements, hence allowing for a more accurate stability analysis.