| Project/Area Number |
60550034
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
応用物理学一般(含航海学)
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| Research Institution | The Institute of Scientific & Industrial Research, Osaka University |
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Principal Investigator |
OWAKI Shigehiro Inst. Sci. Ind. Res.,Osaka Univ. Asst. Prof., 産業科学研究所, 講師 (50029873)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIURA Tetsuya Inst. Sci. Ind. Res., Osaka Univ., 産業科学研究所, 教務職員 (50112066)
KATAGIRI Kazumune Inst. Sci. Ind. Res., Osaka Univ. Asst., 産業科学研究所, 助手 (90029893)
OHKUMA Jujo Inst. Sci. Ind. Res., Osaka Univ. Asst. Prof., 産業科学研究所, 講師 (60029858)
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| Project Period (FY) |
1985 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1986: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1985: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | Short light pulse / Cherenkov effect / UV light source / 紫外光源 |
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| Research Abstract |
Cherenkov radiation arising from intense and high energy electron pulses passing through dielectric materials can be utilized for a light pulse source. An unique light pulse source was developed using Cherenkov radiation with an electron linear accelerator (linac) which can produce ultra short pulses of a few tens picosecond and of energy of 30 MeV with high charge per pulse. As intensity and a radiation angle of the Cherenkov light are determined by refractive indexes of the dielectric materials, high purity fused silica of large index and 1 atm air of small one were selected as the radiators. The former generates intense light but radiates in a large angle. Light from the latter is superior for long distance transportation because of the small radiation angle. Spectral distributions of the light sources were observed with light pulse height analysis. They have peaks at UV region near an absorption edge ( <about> 200 nm) of each radiator and continuously degradate towards IR region. Pulse shapes of the light were observed by a real time streak camera system of a time resolution of 10 ps. A minimum light pulse width of 30 ps was easily obtained in a normal linac operation mode and the 14 ps pulse was feasible in a special mode. The linac, radiators and optical system are arranged for some experiments using ultra short light pulses.
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