| Project/Area Number |
11480119
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear engineering
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| Research Institution | Hokkaido University |
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Principal Investigator |
KIYANAGI Yoshiaki Hokkaido Univ., Grad.School of Eng., Prof., 大学院・工学研究科, 教授 (80002202)
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| Co-Investigator(Kenkyū-buntansha) |
HIRAGA Fujio Hokkaido Univ., Grad. School of Eng., Asst., 大学院・工学研究科, 助手 (00228777)
KAMIYAMA Takashi Hokkaido Univ., Grad.School of Eng., Asst.Prof., 大学院・工学研究科, 助教授 (50233961)
SAWAMURA Sadashi Hokkaido Univ., Grad.School of Eng., Prof., 大学院・工学研究科, 教授 (70002011)
KAWABATA Yuji Kyoto Univ.Research Reactor, Asst.Prof., 原子炉実験所, 助教授 (00224840)
FURUSAKA Michihiro KEK Instutut of Materials Structure Science, Prof., 物質構造科学研究所, 教授 (60156966)
曽山 和彦 日本原子力研究所, 研究員
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥13,400,000 (Direct Cost: ¥13,400,000)
Fiscal Year 2000: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 1999: ¥9,800,000 (Direct Cost: ¥9,800,000)
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| Keywords | neutron beam / neutron focusing / magnetic neutron lens / spin flipper / multi-capiraly fiber / capiraly radius / Wavelength dependence of neutron transmission / 冷中性子輸送 / 磁気中性子レンズ / 位置敏感型検出器 |
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| Research Abstract |
Narrow neutron beam with high intensity will open wide variety of neutron utilization fields. We studied two methods to focusing the neutoron beam. One is neutron mzgnetic lens by using 6 pole magnetic field, and the other is multi-capilary fiber.
About magnetic lens, first we measured the neutron intensity through the lens and found that there exist factor 2 difference in focusing intensity between simulation and experiment. We tried to explain the reason of We found that there existed some distortion in the lens system due to strong force of high magnetic field and that this would cause gaps between magnet components. These gaps reduced the intensity. Succeedingly, we studied a function of the mfagnetic lens to forcus and pararell the neutron beasm, in which system two lenses are arranged in a series. For such a system we need neutron spin flipper to change orientation of the neutron spin between the two lenses. We observed the evidence of the neutron focusing and defocusing by using the spin flipper. This suggest the system works as neutron focusing and pararelling device.
Second, we studied the wavelength dependence of neutron transmission through a multi-capirally fiber in order to know the effectiveness for utilization of white beam. A three dimensional simulation code was developed to analyze the transport characteristics. Transmission intensity depend on the radius of the capirally and also on the curvature of the fiber setting. The transmission of longer wavelength neutrons increases with the radius. Simulation indicated that the wavelength dependence of transmission could not be explained by ideal condition of the fiber and we needed to introduce distorsion in the fiber, such as waving. These data are very useful to make devices using multi-capiraly fiber.
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