| Project/Area Number |
16360477
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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 | Osaka Prefecture University |
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Principal Investigator |
ISHIDA Takekazu Osaka Prefecture University, Department of Physics and Electronics, Professor, 工学研究科, 教授 (00159732)
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| Co-Investigator(Kenkyū-buntansha) |
NOGUCHI Satoru Osaka Prefecture University, Department of Physics and Electronics, Associate Professor, 工学研究科, 助教授 (70180718)
KAWAMATA Shunichi Osaka Prefecture University, Department of Physics and Electronics, Lecturer, 工学研究科, 講師 (50211868)
KATO Masaru Osaka Prefecture University, Department of Physics and Electronics, Associate Professor, 工学研究科, 助教授 (90204495)
MACHIDA Masahiko Japan Atomic Energy Agency, Center for Computational Science and Engineering, Senior Researcher, システム計算科学センター, 主任研究員 (60360434)
YOTSUYA Tsutomu Technology Research Institute of Osaka Prefecture, Research Manager, 情報電子部, 部長 (70393296)
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| Project Period (FY) |
2004 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥15,100,000 (Direct Cost: ¥15,100,000)
Fiscal Year 2005: ¥5,700,000 (Direct Cost: ¥5,700,000)
Fiscal Year 2004: ¥9,400,000 (Direct Cost: ¥9,400,000)
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| Keywords | MgB_2 / neutron detector / thin films / pulsed laser / Earth simulator / Thermal relaxation |
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| Research Abstract |
The thermal response of a membrane-structured MgB_2 film can be used to detect various sorts of radiations. High-quality MgB_2 films were prepared by a sputtering technique. The MgB_2 radiation detector consisted of an MgB_2 thin-film meander line on a 0.5-μm-thick SiN membrane. The detector devices were placed in a 4K refrigerator, and the operating temperature was controlled at a certain temperature below T_c. Light from a 20-ps pulsed laser directly irradiated the MgB_2 device ; the end of the optical fiber was fixed in front of the device. An erbium-doped fiber amplifier (EDFA) and a GP-IB attenuator were used to control the laser power, and the output voltage was observed through a low-noise amplifier by using a digital oscilloscope. The output signals caused by thermal response were clearly observed. Systematic studies of the output signals were conducted, and effects of device design, dc bias conditions, bias temperature, and input laser power were considered. We report the out-of-equilibrium thermodynamics, which was investigated by means of extensive computer simulations based on the time-dependent Ginzburg-Landau equations, thermodynamics, and electrodynamics. Large-scale calculations were carried out under the realistic conditions of actual devices by using an Earth Simulator (ES). We demonstrated that one attractive application is to use the device as a novel neutron detector by employing the ^<10>B(n,α)^7Li nuclear reaction with a local energy release of 2.3 MeV.
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