| Project/Area Number |
12680504
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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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 |
FUJITA Fumiyuki Hokkaido Univ., Grad. School of Eng., Instructor, 大学院・工学研究科, 助手 (10002312)
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2001: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2000: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | parametric X-rays / Electron LINAC / single crystal / tenability / monochromaticy / hard X-ray field / K-edge absorption / Rragg condition / パラメトリックX線 / 相対論的速度の荷電粒子 / 分極放射 / 相対論的な場の量子論 / ブロッホ場 / Si単結晶 / 単色X線 / 可変エネルギーX線 |
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| Research Abstract |
When a relativistic electron is passing through a single crystal, it. generates X-rays to the direction corresponding to the Bragg condition. The generated X-rays are new type and named as parametric X-rays (PXR). Parametric X-rays constitute a tunable source (by rotating the crystal relative to the direction of the incident electron beam) of monochromatic and very directional X-rays. As one of the purpose of this project, we attempted to confirm a high-quality tunable monochromatic hard X-ray radiation field. The conditions of constructing this X-ray field were determined by the classical and quantum field theory and experiments using HOKUDAI 45 MeV Electron LINAC.
For an electron beam incident on a Si single crystal at an angle φ = 10°to the (100) surface, PXR was detected at the point of 3 m distant from the target at an angle θ=20°. The 15〜 30 keV hard X-ray fields were constructed. For the energy and angular distributions of PXR, the theoretical results were in agreement with the experiments. The tunability and monochromaticy of PXR were confirmed.
Another purpose of this project was applications by using the tunable monochromaticy of PXR. The K-edge absorption characteristics of Nb, Zr and Mo were measured. The experimental results were agreed quite well with the theoretical results on the Web: http://physics.nis.gov/PhysRefData/cover.html. In synchrotron radiation a high amount of monochromaticy can be achieved by passing the radiation through a crystalline Bragg diffractor. As synchrotron radiation is very intense, however, the huge loss of intensity suffered by this Bragg diffraction can sometimes be partially accepted. PXR can be sufficiently useful and tactful without a huge scale accelerator.
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