Experimental simulation of Edge Localised Modes using focused electron beams – features of a circular load pattern
Experimental simulation of Edge Localised Modes using focused electron beams – features of a circular load pattern
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DOI：
10.1016/j.jnucmat.2010.08.065
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发表时间：
2011-08
影响因子：
3.1
通讯作者：
T. Loewenhoff;T. Hirai;S. Keusemann;J. Linke;G. Pintsuk;A. Schmidt
中科院分区：
文献类型：
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作者：
T. Loewenhoff;T. Hirai;S. Keusemann;J. Linke;G. Pintsuk;A. Schmidt
在未来的约束实验中，边缘局域模（ELMs）对面向等离子体的材料（PFMs）造成的退化过程的知识是必不可少的，允许第一壁和偏滤器组件的寿命估计。与其他实验（例如等离子体流）相比，电子束模拟发生的热负荷具有能够在更高频率下工作的优点，从而允许大量的ELM样热脉冲。本文介绍了在德国于利希研究中心JUDITH 2装置上使用的电子束制导方法。由于光束通过具有可变FWHM的高斯轮廓很好地描述，取决于几个参数，例如真空压力，因此为了实现近似均匀（ELM样）的加载，引导是特别感兴趣的。圆形图案被证明提供了优点，特别是与针对束宽波动的增加的稳定性有关。
The knowledge about degradation processes caused by Edge Localised Modes (ELMs) on plasma facing materials (PFMs) in future confinement experiments is essential to allow lifetime estimations for first wall and divertor components. Electron beam simulations of the occurring heat loads have the advantage to be able to work at higher frequencies compared to other experiments (e.g. plasma streams), allowing a large number of ELM-like heat pulses. This paper deals with the electron beam guidance method used in the JUDITH 2 facility in Forschungszentrum Jülich (Germany). As the beam is described well by a Gaussian profile with a variable FWHM, depending on several parameters, e.g. vacuum pressure, the guidance is of special interest in order to achieve an approximately homogeneous (ELM-like) loading. A circular pattern turned out to provide advantages, in particular related to an increased stability against beam width fluctuations.