Construction of Novel Reflectometer with Pulsed Thermal Neutron for Free Surface and Nanostructural Analysis of Polymer Surfaces and Interfaces

一个新的中子反射计（界面和表面分析高级反射计，ARISA）具有垂直散射面几何结构，用于研究自由表面，安装在热中子端口上，观察环境温度的水减速剂。ARISA是一种独特的反射计，使用脉冲散裂中子源的热中子，也是日本第一个具有垂直散射平面几何形状的中子反射计。为了最大限度地减少由于束流空穴本身产生的屏蔽损失而直接来自中子目标的高能中子，安装了具有两个束流空穴和中子束线屏蔽的内铁准直器。内准直器形成两个独立的、角度不同的向下光束孔，0-0.47度和1.4度。中子束流线屏蔽也具有附加束流屏蔽的功能。利用波长为0.07-0.4 nm的中子，液体样品和固体样品的中子动量传递覆盖范围的设计规范分别为0.008-0.61 Å^<-1>和0.008-2.8 Å^<-1>。制备了液槽和高温电池作为样品环境设备。性能测试已经开始使用镍薄膜和一些聚合物系统。

A new neutron reflectometer (Advanced reflectometer for Interface and Surface Analysis, ARISA) with vertical scattering-plane geometry for studying free surface was installed at a thermal neutron port viewing an ambient-temperature water moderator at KENS.ARISA is a unique reflectometer using thermal neutrons at a pulsed spallation neutron source as well as the first neutron reflectometer with vertical scattering-plane geometry in Japan. An inner iron collimator with two beam holes and a neutron beam-line shield were installed to minimize high-energy neutrons directly coming from the neutron-target due to the shield loss produced by beam holes themselves. The inner collimator makes two independent downward beam holes with different angles, 0-0.47 degree and 1.4 degree. The neutron beam-line shield has function of an additional beam-shutter as well. The designed specifications for the covered range of neutron momentum transfer in the vertical direction are 0.008-0.61 Å^<-1> and 0.008-2.8 Å^<-1> for liquid and solid samples, respectively, using neutrons within wavelength range of 0.07-0.4 nm. A liquid trough and a high-temperature cells were prepared as sample environment equipments. The performance tests have been started using nickel films and a few polymer systems.