Design of a compact electron accelerator-driven pulsed neutron facility at AIST
| Autor: | Akira Watazu, Koichi Kino, Nagayasu Oshima, Ryunosuke Kuroda, Hiroshi Ogawa, Brian E. O'Rourke, Ryoichi Suzuki, Noriyosu Hayashizaki, Masahito Tanaka, Daisuke Satoh, Hiroyuki Toyokawa, Koji Michishio, Takeshi Fujiwara, Norihiro Sei, T. Shishido, Takemi Muroga, Michihiro Furusaka |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Nuclear and High Energy Physics 010308 nuclear & particles physics business.industry Neutron imaging Resolution (electron density) 0211 other engineering and technologies Particle accelerator 02 engineering and technology Neutron radiation 01 natural sciences law.invention Wavelength Optics law 0103 physical sciences Cathode ray Neutron business Instrumentation Beam (structure) 021102 mining & metallurgy |
| Zdroj: | Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 927:407-418 |
| ISSN: | 0168-9002 |
| DOI: | 10.1016/j.nima.2019.02.062 |
| Popis: | We have designed and been constructing a compact accelerator-driven neutron facility for Bragg edge transmission imaging of structural materials to obtain position dependent crystallographic information. In order to combine a high neutron wavelength resolution, which is especially required for strain measurements, and an intense neutron beam flux at the sample position, which is required for obtaining high quality statistics within practical measurement times, the components of the neutron facility are optimized. To achieve a high wavelength resolution while maintaining an intense neutron beam flux at the sample position, a solid methane decoupled cold moderator at about 20 K coupled with neutron guide tubes is employed. The target–moderator system, especially the moderator thickness was optimized using the Monte-Carlo simulation code PHITS. Neutrons will be produced using a 35-MeV electron accelerator which is currently under construction. The accelerator has a design maximum beam power of 10 kW, a maximum repetition rate of 100 Hz and a maximum pulse width of 10 μ s . The combination of the flight path length of about 8 m and the repetition rate is suitable for efficient Bragg edge measurements. The pulse width of the electron beam is suitable to achieve a high wavelength resolution with the solid methane decoupled moderator. The estimated flux of the neutron beam at the sample position is 1.2 × 104 ∼ 4 . 5 × 104 /cm2/s depending on the usage of super mirror guide tubes. The wavelength resolution at the sample is 0.5 ∼ 0.7% in the wavelength region from 0.3 to 0.4 nm. |
| Databáze: | OpenAIRE |
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