In superconducting radiofrequency accelerating cavities for particle accelerators, the Nb/Cu structure is one of the alternatives to bulk Nb but R&D is required to achieve a reproducible performance that competes with bulk Nb. The DC entry field H _en and critical temperature were studied in the thin Nb films deposited by magnetron sputtering on Cu substrate. The Nb surfaces were further treated by Nd:YAG laser at four energy doses (D1 = 350, D2 = 233, D3 = 175 and D4 = 140 J cm⁻²). The superconducting properties and other characteristics obtained by atomic force microscope, scanning electron microscope and x-ray diffraction were compared before and after laser treatment. The laser treatment increased the field of first flux entry by up to 65% compared to a non-irradiated sample. The laser irradiation also led to reduction of surface roughness, improvement of the surface morphology, reduction in crystallite size and increase of lattice parameter.

在粒子加速器的超导射频加速腔中，Nb/Cu 结构是块状 Nb 的替代品之一，但需要研发以实现与块状 Nb 竞争的可再现性能。研究了通过磁控溅射在 Cu 衬底上沉积的 Nb 薄膜中的 DC 入口场H _en和临界温度。Nb 表面通过 Nd:YAG 激光在四种能量剂量下进一步处理（D 1 = 350、D 2 = 233、D 3 = 175 和D 4 = 140 J cm ^-2）。比较了激光处理前后原子力显微镜、扫描电子显微镜和X射线衍射所获得的超导性能和其他特性。与未辐照的样品相比，激光处理使第一通量进入的场增加了 65%。激光照射还导致表面粗糙度降低、表面形貌改善、微晶尺寸减小和晶格参数增加。