论文标题
用电镍磷的表征超电 - 不足存储
Characterization of electroless nickel-phosphorus plating for ultracold-neutron storage
论文作者
论文摘要
Electross Nickel Plating是一个已建立的工业过程，可提供适用于运输和存储超速中子（UCN）的稳健且相对较低的涂层。使用粗糙度测量和UCN储存实验，我们表征了由抛光铝制或由几个供应商铺设的不锈钢管制成的UCN指南。所有电气镍平台都适用于UCN存储，每壁弹跳平均损失概率为$ 2.8 \ cdot10^{ - 4} $至$ 4.1 \ cdot10^{ - 4} $，用于90 NEV和190 NEV和190 NEV之间的能量，或者是fermi $ 1.7 $ 1.7^$ 1.7^$ 1.7^$ 1.7^$ 1.7^ $ 3.3 \ cdot10^{ - 4} $。不同高程的测量表明，假想的费米电位很好地描述了UCN损失的能量依赖性。需要一些特殊的考虑来避免在电镀过程中表面粗糙度增加，从而减少UCN传输。粗糙度的增加仅对存储特性产生了较小的影响。基于这些发现，我们选择了一个供应商来将UCN产生的容器铺装，该容器将包含用于新的Triumf Ultracold Advanced中子（TUCAN）源的超富壳转换器，以$ {η= 3.5（5）\ cdot10^{ - 4}} $。
Electroless nickel plating is an established industrial process that provides a robust and relatively low-cost coating suitable for transporting and storing ultracold neutrons (UCN). Using roughness measurements and UCN-storage experiments we characterized UCN guides made from polished aluminum or stainless-steel tubes plated by several vendors. All electroless nickel platings were similarly suited for UCN storage with an average loss probability per wall bounce of $2.8\cdot10^{-4}$ to $4.1\cdot10^{-4}$ for energies between 90 neV and 190 neV, or a ratio of imaginary to real Fermi potential $η$ of $1.7\cdot10^{-4}$ to $3.3\cdot10^{-4}$. Measurements at different elevations indicate that the energy dependence of UCN losses is well described by the imaginary Fermi potential. Some special considerations are required to avoid an increase in surface roughness during the plating process and hence a reduction in UCN transmission. Increased roughness had only a minor impact on storage properties. Based on these findings we chose a vendor to plate the UCN-production vessel that will contain the superfluid-helium converter for the new TRIUMF UltraCold Advanced Neutron (TUCAN) source, achieving acceptable UCN-storage properties with ${η=3.5(5)\cdot10^{-4}}$.
