Measurement of an electron bunch and establishment of the intense mm wave light source with the coherent radiation
| Project/Area Number |
11680517
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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 | Osaka University |
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Principal Investigator |
OKUDA Shuichi Osaka University, ISIR, Assistant Professor, 産業科学研究所, 講師 (00142175)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Toshiharu Kyoto University, KURRI,, 原子炉実験所, 助手 (00273532)
KATO Ryukou ISIR, Associate Professor, 産業科学研究所, 助教授 (20273708)
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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 |
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 2000: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1999: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | Coherent radiation / Electron bunch / Electron linac / mm wave light source |
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| Research Abstract |
The coherent radiation from high-energy short electron bunches has a continuous spectrum in a submillimeter to millimeter wavelength range. In this work a new high-brightness millimeter wave light source has been established by using the coherent radiation.
The spectra of the coherent transition radiation from the intense beam of the ISIR electron linac have been measured with an interferometer and far-infrared light detectors, silicon bolometers. The electron bunch shape has been evaluated from the results. The monitoring system for the fine structure of the electron bunch shape has been established. The operational conditions of the linac have been optimized so as to obtain stable and intense radiation. The coherent transition radiation has been transported out from the accelerator room. This is the first system established for the absorption spectroscopy with a grating spectrometer.
The peak and the averaged power of the radiation are more than five and more than one order of magnitude higher than those of the other light sources, respectively. The intense light source can be applied to the absorption spectroscopy of matters with relatively strong absorption and to investigating nonlinear effects.
Absorption spectroscopy has been performed for N_2O gas, which is a standard material for the far-infrared spectroscopy. Measurements have been also carried out for water samples having strong absorption and the temperature dependence has been investigated. The wavelength resolution is 1%. These are the first results which have been obtained by using a grating spectrometer. Pulse radiolysis experiments have been also performed. The future wide-range applications of the light source are expected.
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Report
(3 results)
Research Products
(6 results)
