Development and demonstration of a multi-channel spheroidal focusing device for neutron beams

International Workshop on Neutron Optics and Detectors

Hayashida, H.^1 ; Soyama, K.^1 ; Yamazaki, D.^1 ; Maruyama, R.^1 ; Yamamura, K.^2

J-PARC Center, Japan Atomic Energy Agency, Tokyo, Ibaraki 319-1195, Japan^1

Department of Precision Science and Technology, Osaka University, Suita, Osaka 565-0871, Japan^2

关键词: Multi-channel structure;    Neutron focusing;    Neutron focusing devices;    Neutron intensities;    Spatial resolution;    Standard samples;    Time of flight spectrum;    Two dimensional focusing;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/528/1/012007/pdf
DOI  :  10.1088/1742-6596/528/1/012007

来源: IOP

【 摘 要 】

A multi-channel neutron focusing mirror is a compact device that can effectively enhance neutron intensity because the multi-channel structure can cover a large divergence of a neutron beam. In this study, we attempted to develop a compact multi-channel spheroidal (MS) neutron focusing device for two-dimensional focusing. A prototype of the MS mirror consists of three spheroidal mirrors of different diameters. The mirrors are fabricated through the copper plating method without supermirror coating and are aligned coaxially using ring-shaped spacers. The MS mirror was demonstrated at beam line 10 NOBORU port at J-PARC, which provides neutron beams with time-of-flight spectra. A gain factor of 6 in neutron intensity was obtained over wavelengths greater than 0.5 nm, and an imaging test with sample scanning could be performed with an exposure time of 10 s. A Gd-patterned standard sample was employed and a 2D image with a spatial resolution of 200 μm was successfully obtained.