Feasibility study on visualization of transient phenomena using high resolution on-line neutron imaging system at J-PARC

過渡現象の高解像度オンライン可視化に関する基礎的研究

瀬川 麻里子   ; 甲斐 哲也   ; 大井 元貴 ; 高峰 潤 ; 呉田 昌俊   

Segawa, Mariko; Kai, Tetsuya; Oi, Motoki; Takamine, Jun; Kureta, Masatoshi

In the present study, we aimed to develop a neutron imaging system which allows us to visualize transient phenomena with high spatial resolution and real-time. Therefore, a camera (CMOS, 48 frame/sec) system which could obtain one TOF image resolved into narrow energy ranges with an each single pulsed neutron consecutively in the energy region from 0.01 to a few keV was constructed. Qualities of the images obtained with the system, such as spatial resolution, neutron energy selectivity of the system, and capability for visualization of transient phenomena, were examined experimentally. The results figured out that the spatial resolution defined by modulation transfer function was 1.8 at En 0.01 eV. And the energy selectivity was confirmed by the scanning of the sample made by Au, which had a large resonance at En = 4.9 eV. Finally, the system could visualize the transient phenomena to fall the Fe powder on a sandglass. The experiments showed that the system can visualize the real-time neutron energy resolved images with a good spatial resolution even at transient phenomena.