气相扩散法制备Nb₃Sn中热沟槽效应对涡旋穿透的影响分析
Analysis of Thermal Grooving Effects on Vortex Penetration in Vapor-Diffused Nb3Sn
AI总结：
针对气相扩散Nb₃Sn超导射频腔峰值磁场不达理论值的问题，研究镀膜时长对其表面形貌的影响，发现热沟槽晶界是加速电场下降的主因，且沟槽严重程度随镀膜时长增加而加剧。
摘要：
尽管理论上Nb₃Sn在任意给定温度下都比铌（Nb）具备更优异的超导射频腔性能（Q₀和加速电场Eₐcc），但其峰值射频磁场始终达不到400 mT的理论预测值。人们普遍推测，气相扩散法制备的Nb₃Sn表面形貌相对粗糙，是限制锡气相扩散法制备的Nb₃Sn镀Nb腔可实现性能的因素之一。本文研究了镀膜时长对Nb基底上气相扩散Nb₃Sn表面形貌的影响，并利用原子力显微镜形貌图计算了相应的磁场增强因子和过热场抑制因子。研究表明，热沟槽化的晶界是主要缺陷，可能导致可实现加速电场大幅下降。由于镀膜过程中热沟槽不断加深，这类沟槽的严重程度随总镀膜时长的增加而加剧。
英文摘要：
While Nb3Sn theoretically offers better superconducting RF cavity performance (Q0 and Eacc) to Nb at any given temperature, peak RF magnetic fields consistently fall short of the 400 mT prediction. The relatively rough topography of vapor-diffused Nb3Sn is widely conjectured to be one of the factors that limit the attainable performance of Nb3Sn-coated Nb cavities prepared via Sn vapor diffusion. Here we investigate the effect of coating duration on the topography of vapor-diffused Nb3Sn on Nb and calculate the associated magnetic field enhancement and superheating field suppression factors using atomic force microscopy topographies. It is shown that the thermally grooved grain boundaries are major defects which may contribute to a substantial decrease in the achievable accelerating field. The severity of these grooves increases with total coating duration due to the deepening of thermal grooves during the coating process.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
