Fabrication of Nano-Columnar Tungsten Films and Their Deuterium and Helium Ion Irradiation Effects

Nuclear fusion energy for electricity generation is drawing significant attention, due to the fact that it is a clean, safe, and environmentally friendly energy source. The plasma facing material （PFM） is one of the key factors that determine the development of fu- sion reactors. The fusion energy system requires ex- cellent performance of PFMs under high heat flux de- position and particles irradiation. PFMs not only are exposed to unprecedented steady-state and tran- sient power fluxes, but also are bombarded with un- precedented neutron fluxes. In nuclear fusion reactors, the PFM suffers from high-energy （14MeV） neutron irradiation and a high heat flux of ～10MW/m2. A variety of point defects （e.g., interstitials, vacan- cies, helium, and hydrogen gas atoms） are produced in the process of irradiation through atomic displace- ment and nuclear transformation. These point defects form defect clusters （e.g., voids and interstitial loops） and thus change the mechanical properties and mi- crostructure of the material even to the extent that their structural integrity is compromised.     

离子镀制备Cr/W混合过渡层的氢氘辐照效应研究

用双离子束镀膜方法在W基底表面制备不同厚度的Cr薄膜. 用冷场扫描电镜能谱分析仪对镀膜样品成分深度分布进行分析, 使用重离子加速器对镀膜样品进行高能、低束流的氢或氘辐照, 用扫描电镜对样品表面形貌变化进行分析, 运用粒子注入射程模拟软件SRIM对氢粒子在Cr/W双层块体中的射程进行模拟分析. 实验结果表明, 运用双离子束镀膜法能够在膜与基底的接触面区域制得Cr/W混合过渡层; 在高能、低束流的氢或氘辐照下, Cr/W混合过渡层易于使气体滞留而起泡, 双离子束制备的Cr膜层不易聚集氢或氘气体成泡.