The thermal diffusion of nanostructured W fuzz layers formed over W divertor targets due to fusion-relevant He⁺ irradiations remain unclear so far. By analyzing the collision process of energetic He⁺ and D⁺ ions in the fuzz layers, we have calculated the temperature distribution and heat flux of fuzz layers under low-energy (10–200 eV) and high-flux (10²²–10²⁵/m²⋅s) He⁺/D⁺ irradiations. Both the heat flux of fuzz layers and the temperature difference ($\Delta T$) between the top and bottom of fuzz layers are determined by the radius of W nanofibers, the thickness of fuzz layers, and the heat load over W targets. Our simulation predicts that under fusion-relevant He⁺/D⁺ irradiations at the energy of < 100 eV and the flux of < 1.0 × 10²⁴/m²⋅s, $\Delta T$ is lower than 35 K when the heat load over the divertor varies in the range of < 10 MW/m². Under the fusion-relevant He⁺/D⁺ irradiations, the heat flux of nanostructured fuzz layers is about 13–19% of the extremely high heat load over the W targets, indicating that the fuzz layers over W divertor targets can be very important for decreasing the extremely high heat load, such as type – I edge localized modes in the fusion device.

由于与融合相关的 He ⁺辐照，在 W 偏滤器目标上形成的纳米结构 W 绒毛层的热扩散目前仍不清楚。通过分析高能He ⁺和D ⁺离子在绒毛层中的碰撞过程，我们计算了低能（10-200 eV）和高通量（10 ²² –10 ²⁵ /m ² ⋅s) He ⁺ /D ⁺辐照。绒毛层的热通量和温差（$\Delta 吨$) 绒毛层顶部和底部之间的距离由 W 纳米纤维的半径、绒毛层的厚度和 W 目标上的热负荷决定。我们的模拟预测，在能量 < 100 eV 和通量 < 1.0 × 10 ²⁴ /m ² ⋅s的与聚变相关的 He ⁺ /D ⁺辐照下，$\Delta 吨$低于35 k当在偏滤器的热负荷中的<10兆瓦/米的范围内变化²。在与聚变相关的 He ⁺ /D ⁺辐照下，纳米结构绒毛层的热通量约为 W 靶上极高热负荷的 13-19%，表明 W 偏滤器靶上的绒毛层对于降低极高的热负荷，例如聚变装置中的 I 型边缘局部模式。