Developments of pulsed neutron imaging system with camera-type detectors at J-PARC

Segawa, Mariko   ; Kai, Tetsuya   ; Oi, Motoki ; Shinohara, Takenao   ; Eto, Takeharu*; Arai, Masatoshi; Kureta, Masatoshi   

Two kinds of neutron energy resolved imaging system with a time-of-flight technique have been newly developed and installed at Japan Proton Accelerator Research Complex (J-PARC) with the aim to investigate more rapidly a spatial distribution of several elements and crystals in various kinds of materials or substances. Firstly, a high-speed video camera (CMOS) equipped the system allows to obtain TOF images consecutively resolved into narrow energy ranges in the pulsed neutron energy region from 0.01 to a few keV. Qualities of the images obtained with the system, such as spatial resolution, dependence of the brightness on the neutron energy and measurement errors (2 %) of the system were examined experimentally and evaluated by comparison with those of conventional imaging system. The results obtained in the experiments show that the system can visualize the neutron energy resolved images within a small error even at high speed. Secondly, we developed a high resolution on-line neutron imaging system in order to visualize transient phenomena. The system allows us to obtain a TOF image in the pulsed neutron at J-PARC. We will report the entire performance of this system and capability for practical application, and the new camera system equipped in situ image sensor with the signal accumulation function will be introduced.