离子注入核材料热扩散率的非接触测量
Non-Contact Measurement of Thermal Diffusivity in Ion-Implanted Nuclear Materials
摘要：
由于辐照损伤的机械和物理性质演变的知识是未来的裂变和聚变反应堆的发展是必不可少的。离子辐照提供了一个很好的代理研究辐照损伤，允许高损伤剂量，而不激活样品。有限的离子渗透深度意味着仅产生几微米厚的受损层。大量的努力已经致力于探测这些薄注入层的机械性能。然而，虽然反应堆设计的关键，它们的热传输性能仍然在很大程度上未被探索，由于缺乏合适的测量技术。在这里，我们展示了非接触式热扩散率测量离子注入钨核聚变装甲。与嬗变元素的合金化和保留气体与嬗变引起的缺陷的相互作用都导致热扩散率的急剧降低。我们的建模方法很好地捕捉了这些变化。我们的观测结果对未来核聚变电站的设计具有重要意义。
英文摘要：
Knowledge of mechanical and physical property evolution due to irradiation damage is essential for the development of future fission and fusion reactors. Ion-irradiation provides an excellent proxy for studying irradiation damage, allowing high damage doses without sample activation. Limited ion-penetration-depth means that only few-micron-thick damaged layers are produced. Substantial effort has been devoted to probing the mechanical properties of these thin implanted layers. Yet, whilst key to reactor design, their thermal transport properties remain largely unexplored due to a lack of suitable measurement techniques. Here we demonstrate non-contact thermal diffusivity measurements in ion-implanted tungsten for nuclear fusion armour. Alloying with transmutation elements and the interaction of retained gas with implantation-induced defects both lead to dramatic reductions in thermal diffusivity. These changes are well captured by our modelling approaches. Our observations have important implications for the design of future fusion power plants.
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