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偏滤器是托卡马克中与等离子体直接接触的部件,为了保证装置的寿命,需要尽可能地减小等离子体对偏滤器靶板的侵蚀.本文用粒子模拟的方法研究了不同等离子体温度情况下碳和铍两种杂质离子对钨偏滤器侵蚀速率的影响.模拟首先得到稳定的鞘层结构、入射到靶板的离子流和能流密度,并通过统计获得了入射离子的能量和角度分布,最终根据这些物理参量,采用经验公式计算出钨靶板的侵蚀速率.研究表明,在等离子体温度不太高的情况下,钨靶板的热侵蚀几乎不起作用,而由于杂质离子对钨的物理溅射阈值较低,并且会通过鞘层加速获得能量,因此其对钨壁材料的物理溅射是导致靶板侵蚀的主要原因,另外靶板材料的侵蚀速率随着等离子体温度升高以及杂质含量增大而急剧增大.
In order to ensure the lifetime of the device, it is necessary to minimize the erosion of the plasma target on the divertor target.This paper uses particle simulation method to study the different plasma temperature conditions Carbon and beryllium ions on the erosion rate of tungsten divertor.The simulation first obtained a stable sheath structure, the ion flux and energy flux into the target plate, and obtained the energy and angular distribution of the incident ion by statistics Finally, according to these physical parameters, the erosion rate of tungsten target is calculated by empirical formula.The results show that the thermal attack of tungsten target is almost ineffective when the plasma temperature is not too high, The physical sputtering threshold is lower, and the energy is accelerated through the sheath. Therefore, the physical sputtering of tungsten wall material is the main reason leading to target erosion. In addition, the erosion rate of target material increases with the increase of plasma temperature As well as the content of impurities increases sharply increased.