Development of high-reflectivity neutron supermirrors using an ion beam sputtering technique
Development of high-reflectivity neutron supermirrors using an ion beam sputtering technique
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DOI：
10.1016/j.nima.2008.11.062
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发表时间：
2009-02
影响因子：
1.4
通讯作者：
R. Maruyama;Dai Yamazaki;T. Ebisawa;K. Soyama
中科院分区：
文献类型：
--
作者：
R. Maruyama;Dai Yamazaki;T. Ebisawa;K. Soyama
中子超反射镜已成为中子束传输、弯曲和聚焦的重要器件。为了生产用于新型溅射中子源（日本质子加速器研究综合体，J-PARC）的这些光学器件，日本原子能机构安装了有效沉积面积为0.2m2的离子束溅射（IBS）系统。我们采用NiC/Ti多层膜代替传统的Ni/Ti多层膜成功地制备了高反射率的超反射镜。NiC/Ti超反射镜的中子反射率在临界角分别为0.88和0.82，比镍大3倍和4倍。我们还证明，可以制造出在临界角处反射率为0.40的NiC/Ti超反射镜，其反射率比镍的反射率大6倍。
Neutron supermirrors have increasingly become important devices for transporting, bending, and focusing neutron beams. To produce these optical devices for the new spallation neutron source (Japan Proton Accelerator Research Complex, J-PARC), an ion beam sputtering (IBS) system with an effective deposition area of 0.2m2has been installed at the Japan Atomic Energy Agency. We have succeeded in fabricating high-reflectivity supermirrors by adopting NiC/Ti multilayers instead of conventional Ni/Ti multilayers. The neutron reflectivity of the NiC/Ti supermirrors is 0.88 and 0.82 at critical angles 3 and 4 times larger, respectively, than that of nickel. We have also demonstrated that a NiC/Ti supermirror with a reflectivity of 0.40 at a critical angle 6 times larger than that of nickel can be fabricated.