液态锂中的氦气泡：ITER的一个潜在问题
Helium bubbles in liquid lithium: a potential issue for ITER
AI总结：
本研究通过微观模型模拟发现，在ITER实验条件下的液态锂中会形成半径约10埃的氦气泡，揭示了氦成核行为对聚变堆增殖包层安全与效率的潜在影响。
摘要：
未来的聚变核反应堆将通过氘和氚的聚变产生可持续能源。为此，反应堆需要通过中子轰击锂来产生自身的氚。这种反应将在反应堆的增殖包层内产生氚和氦。由于氦在液态金属中的溶解度极低，它可以触发成核机制。因此，了解和理解氦成核的微观过程对于提高聚变能生产的效率、可持续性和安全性至关重要。在用作增殖材料的液态金属中形成氦气泡可能是一个严重的问题，目前尚未被完全理解。我们使用一个合适的微观模型，在实验对应的操作条件（800 K和1至100 bar之间的压力）下，进一步深入探讨了锂和氦混合物的行为，该模型能够描述氦和锂的原子相互作用，并与现有实验数据高度吻合。模拟预测，在环境压力下，会形成半径约为10埃的氦气泡，其表面张力值在0.6-1.0 N/m之间，且依赖于氦的浓度。我们还报告了氦的内聚能，以及对Hildebrand和Kumar内聚参数的定量估计。
英文摘要：
Future fusion nuclear reactors will produce sustainable energy form the fusion of deuterium and tritium. In order to do so, the reactors will need to produce their own tritium through the neutron bombardment of lithium. Such reaction will produce tritium and helium inside the breeding blanket of the reactor. Helium can trigger nucleation mechanisms due to its very low solubility inside liquid metals. Consequently, the knowledge and understanding of the microscopic processes of helium nucleation is crucial to improve the efficiency, sustainability and safety of the fusion energy production. The formation of helium bubbles inside the liquid metal used as breeding material may be a serious issue that has yet to be fully understood. We provide further insight on the behavior of lithium and helium mixtures at experimentally corresponding operating conditions (800~K and pressures between 1 and 100 bar) using a suitable microscopic model able to describe the helium and lithium atomic interactions, in excellent agreement with available experimental data. The simulations predict the formation of helium bubbles with radii around 10 Angstroem at ambient pressure and with surface tension values between 0.6-1.0 N/m, with a dependency of the concentration of helium. We also report cohesive energies of helium as well as a quantitative estimation of the Hildebrand and Kumar cohesion parameters.
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