Tungsten is the prime candidate material for divertor applications in future nuclear reactors (e.g. ITER and DEMO). In the present work, a spatially dependent cluster dynamics model is developed to investigate and understand the microstructure evolution of tungsten under low energy helium implantation and neutron irradiation varying over bulk length scales of millimetres and irradiation time scales of hours. The diffusion of helium, helium clusters and their trapping at neutron induced defects is simulated along the tungsten monoblock depth. The temperature gradient resulting from a steady state heat load of 10 MWm⁻² along the monoblock depth is considered and its influence on the evolution of defects is discussed. The trapping of helium at vacancies and the associated formation of helium-vacancy clusters is found to be pronounced in the sub-surface layers. A significant influence of helium detrapping from grain boundaries and dislocations, along with its resolution from clusters, on the helium diffusion length scales is observed. Additionally, the effect of helium cluster mobility is investigated and overall lower retention in the monoblock bulk is observed through significant release of helium at the surface.

钨是未来核反应堆（例如ITER和DEMO）的偏滤器应用的主要候选材料。在目前的工作中，建立了一个空间相关的团簇动力学模型，以研究和了解钨在低能氦注入和中子辐照下的微观结构演变，其体积尺度为毫米，辐照时间尺度为小时。沿钨单体深度模拟氦，氦团簇的扩散及其在中子诱发缺陷处的俘获。由10 MWm ^-2的稳态热负荷产生的温度梯度考虑了沿整体深度的影响，并讨论了其对缺陷演变的影响。发现在空洞处捕获氦气和相关的氦空位簇的形成在地下表面层中是明显的。观察到氦从晶界和位错脱附的显着影响以及其从团簇的分辨对氦扩散长度尺度的影响。此外，研究了氦团簇迁移的影响，并通过氦在表面的显着释放观察到整体块中总体保留率较低。