Detector development for a high-flux neutron reflectometer

1st Conference on Light and Particle Beams in Materials Science 2013

物理学;材料科学

Satoh, S.^1 ; Yamada, N.L.^1 ; Muto, S.^1

High Energy Accelerator Research Organization, Oho 1-1, Tsukuba, Ibaraki 305-0801, Japan^1

关键词: Detector development;    Free liquid surface;    High flux neutrons;    Interfacial structures;    Neutron reflectivity measurements;    Neutron reflectometry;    Reflectivity measurements;    Two Dimensional (2 D);   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/502/1/012050/pdf
DOI  :  10.1088/1742-6596/502/1/012050

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Neutron reflectometry is a powerful tool for investigating the surface and interfacial structures of various materials on the nanometer to submicrometer spatial range. We have been developing a horizontal-type neutron reflectometer, named SOFIA, at BL16 in J-PARC/MLF for investigating such interfacial structures, including those of free liquid surfaces. Utilizing the high-flux neutron beam at J-PARC, we have, until now, efficiently performed reflectivity measurements with SOFIA. However, the maximum count rate of the two-dimensional (2-D) detector currently in use will be insufficient for the full-power operation of J-PARC (1 MW) in the near future. In order to increase the count rate, we developed a new detector comprising 21 one-dimensional (1-D) detectors. 1-D detectors were used because neutron counts for a two-dimensional (2-D) detector can be reduced by dividing it into an array of 1-D detectors. In this study, we evaluated the performance of the newly developed detector and successfully carried out neutron reflectivity measurements using it.