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He cluster dynamics in fusion related plasma facing materials

机译:他在与熔合相关的等离子体表面材料中聚集动力学

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摘要

The theoretical model describing spatiotemporal dynamics of He clusters in tungsten, which takes into account He trap generation associated with the growth of He clusters, is presented. This model is characterized by only one fitting dimensionless parameter γ, which describes the number of new He traps generated per one He atom absorbed in existing traps. Application of this model to the formation of the layer of nano-bubbles underneath of the surface of thick He irradiated sample before surface morphology starts to change gives a very good agreement with all available experimental data: (ⅰ) surface modification starts to be visible when He ion fluence exceeds the critical value ~2-3× 10~(20)cm~2, which does not depend on the magnitude of He ion flux to the surface; (ⅱ) the thickness of the layer ~30 nm; (ⅲ) the characteristic size of nano-bubbles in the layer is ~2 nm and remains the same within the whole layer. All these parameters were fitted simultaneously with a reasonable value y ~ 10~3.
机译:提出了描述钨中He簇时空动力学的理论模型,该模型考虑了与He簇生长相关的He陷阱产生。该模型的特征仅在于一个拟合的无量纲参数γ,该参数描述了在现有陷阱中吸收的每个He原子产生的新He陷阱的数量。在表面形态开始改变之前,将该模型应用于厚He辐照样品表面下的纳米气泡层的形成,可以与所有可用的实验数据很好地吻合:(ⅰ)表面改性在以下情况下开始可见He离子通量超过临界值〜2-3×10〜(20)cm〜2,这与表面He离子通量的大小无关。 (ⅱ)层的厚度〜30 nm; (ⅲ)该层中纳米气泡的特征尺寸为〜2 nm,并且在整个层中保持相同。同时将所有这些参数拟合为合理值y〜10〜3。

著录项

  • 来源
    《Nuclear fusion》 |2015年第7期|073005.1-073005.5|共5页
  • 作者单位

    University of California San Diego, La Jolla, CA 92093, USA;

    University of California San Diego, La Jolla, CA 92093, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    plasma facing components; tungsten; helium; nano-bubbles;

    机译:等离子组件钨氦;纳米气泡;

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