Development of Replica Supermirror

在反应堆堆芯或加速器靶系统中，将中子导管放置在非常靠近冷中子源的地方，可以提取更多的极低能中子。然而，这要求导管应当是极耐辐射的。因此，我们开发了一种用于高辐射环境的金属基中子超反射镜。将常规的（Ni-Ti）超反射镜沉积到浮法玻璃基板上，并且在反射镜的顶部电镀Cu。然后移除玻璃，将复制品超级镜留在铜上。我们描述的制造过程中，并证明，镜子具有良好的反射率，基本上是一个玻璃基超反射镜。

Placing a neutron guide tube very near the cold neutron source in a reactor core or an accelerator target system allows one to extract more very low energy neutrons. However, this requires that the guide tube should be extremely radiation resistant. Therefore, we developed a metal-based neutron supermirror to be used in high radiation environments. A conventional (Ni-Ti) supermirror is deposited onto a float glass substrate and Cu is electroplated on top of the mirror. The glass is then removed, leaving the replica supermirror on the copper. We describe the fabrication process and demonstrate that the mirror has good reflectivity, essentially that of a glass-based supermirror.