Low neutron intensity is a critical problem for neutron scattering measurements at compact sources Among various other methods, reflection-based neutron-focusing devices have been developed to increase the neutron flux on samples. In this study, we utilized nested neutron-focusing optics to converge a neutron beam with large divergence. These optics consisted of nested full conical shells that were assembled from supermirror-coated thin glass sheets with an initially cylindrical form. Specifically, an optimized m = 2 Ni/Ti supermirror coating was applied to the concave sides of cylindrical thin glass substrates utilizing a dedicated DC magnetron sputtering system. A particle collimation system was also incorporated into the deposition process to achieve excellent thickness uniformity for the supermirror coating. As a result, the characterized thickness variation was within 2% on the inner sides of the curved substrates. The internal stress of the supermirror coating was effectively reduced to approximately -135 MPa under a 0.4 Pa working gas pressure. The supermirror coating provided a reflectivity of over 78% with a momentum transfer Q ranging from 0.1 to 0.45 nm${}^{-1}$. Consequently, the neutron flux collected by the focusing optics was enhanced by a factor of 26 compared to a conventional pinhole design according to our experimental results.

低中子强度是紧凑源中中子散射测量的关键问题。在其他各种方法中，已经开发了基于反射的中子聚焦装置以增加样品上的中子通量。在这项研究中，我们利用嵌套的中子聚焦光学器件将发散大的中子束会聚。这些光学器件由嵌套的完整圆锥形壳体组成，这些壳体由具有初始镜筒形状的超镜涂层薄玻璃板组装而成。具体地，利用专用的DC磁控溅射系统将优化的m ＝ 2的Ni / Ti超镜涂层施加到圆柱形薄玻璃基板的凹面。颗粒准直系统也被并入了沉积过程中，从而为超镜涂层实现了出色的厚度均匀性。结果是，在弯曲基板的内侧，特征厚度变化在2％以内。在0.4 Pa的工作气压下，超级镜面涂层的内部应力有效降低至-135 MPa。超级镜面涂层提供了超过78％的反射率以及动量传递Q范围从0.1到0.45 nm${}^{-\mathrm{1个}}$。因此，根据我们的实验结果，与传统的针孔设计相比，聚焦光学器件收集的中子通量提高了26倍。