Abstract

Although plasma-facing components composed of tungsten are less likely to generate dust when compared to other materials, dust generation is still possible during severe transient phenomena in fusion devices. The generation of tungsten dusts was experimentally investigated by exposing tungsten targets to a transient heat flux factor (F_HF) simulated by a high-energy pulsed laser so that the rate of dust generation would be analyzed. The rate of dust generation is observed to be increased linearly with respect to F_HF: G [mg/min] = C (F_EX – F₀), where F_EX is the experimental value of F_HF, F₀ is the threshold F_HF, and C [mg∙m²∙s^1/2/min∙MJ] = 0.0031 ± 0.0002. F_HF indicates that the characteristics of dusts such as size and F_HF are similar to those observed in several toroidal fusion devices. The threshold of F_HF for dust generation was also observed as 41 MJ/m²∙ s^1/2, which is similar to that of the international thermonuclear experimental reactor ITER (50 MJ/m²∙ s^1/2).

摘要

尽管与其他材料相比，由钨构成的面向等离子体的组件不太可能产生灰尘，但在聚变装置中的严重瞬态现象期间仍然可能产生灰尘。通过将钨靶暴露于由高能脉冲激光模拟的瞬态热通量因子 (F _HF )来实验研究钨粉尘的产生，以便分析粉尘产生的速率。观察到粉尘产生率相对于 F _HF呈线性增加：G [mg/min] = C (F _EX – F ₀ )，其中 F _EX是 F _HF的实验值，F ₀是阈值 F _HF , 和 C [mg∙m² ∙s ^1/2 /min∙MJ] = 0.0031 ± 0.0002。F _HF表明粉尘的特征如尺寸和F _HF与在几个环形聚变装置中观察到的相似。还观察到F _HF产生粉尘的阈值为41 MJ/m ² ∙ s ^1/2，与国际热核实验反应堆ITER（50 MJ/m ² ∙ s ^1/2）相似。