Instrumental design and performance of a new pulsed-neutron reflectometer (ARISA) at KENS for studying free surfaces
Instrumental design and performance of a new pulsed-neutron reflectometer (ARISA) at KENS for studying free surfaces
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KENS 用于研究自由表面的新型脉冲中子反射计 (ARISA) 的仪器设计和性能
DOI：
10.1007/s003390101095
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
H. Yamaoka
中科院分区：
文献类型：
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作者：
N. Torikai;M. Furusaka;H. Matsuoka;Y. Matsushita;M. Shibayama;A. Takahara;M. Takeda;S. Tasaki;H. Yamaoka
在KENS脉冲中子源的一个热中子口上安装了一台新的中子反射计（ARISA），用于研究自由表面。ARISA是一种非常独特的反射计，它在脉冲中子源处使用热中子，并且它是日本第一个具有垂直散射面几何结构的反射计。中子束以与水平面成0-0.47°和1.4°的角度向下引导到样品表面上。通过使用不同类型样品的几次测试测量，澄清了镜面反射目前可以测量到低至10- 6 in的反射率和高达3 nm-1 in的中子动量转移沿着垂直方向使用波长为0.1-0.4（0.6）nm的白色中子。通过今后加强屏蔽以减少背景，可进一步改善这一性能。
A new neutron reflectometer (ARISA) for studying free surfaces was installed at one of the thermal neutron ports viewing an ambient-temperature water moderator at the KENS pulsed spallation neutron source. ARISA is quite a unique reflectometer; it uses thermal neutrons at the pulsed neutron source, and it is the first one in Japan with a vertical scattering-plane geometry. The neutron beam is guided downward onto the sample surface at angles of 0–0.47° and 1.4° to the horizontal. Through several test measurements using different types of samples, it was clarified that specular reflection can be currently measured down to 10-6in reflectivity and up to 3 nm-1in neutron momentum transfer along the vertical direction using white neutrons with a wavelength of 0.1–0.4 (0.6) nm. This performance could be further improved by future reinforcement of the shield for background reduction.