1993 Fiscal Year Final Research Report Summary
Development of Infrared Free-Electron Lasers with High-Brightness Electron Beams
| Project/Area Number |
04680230
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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 |
Nuclear engineering
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| Research Institution | Osaka University |
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Principal Investigator |
OKUDA Shuichi Osaka University, ISIR Research Associate, 産業科学研究所, 助手 (00142175)
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| Co-Investigator(Kenkyū-buntansha) |
TAKAMUKU Setsuo Osaka University, ISIR Professor, 産業科学研究所, 教授 (50029849)
OKADA Toichi Osaka University, ISIR Professor, 産業科学研究所, 教授 (40028999)
YAMAMOTO Takayoshi Osaka University, ISIR Assistant Professor, 産業科学研究所, 助教授 (30029243)
OHKUMA Juzo Osaka University, ISIR Associate Professor, 産業科学研究所, 講師 (60029858)
HONDA Yoshihide Osaka University, ISIR Research Associate, 産業科学研究所, 助手 (40209333)
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| Project Period (FY) |
1992 – 1993
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| Keywords | free-electron lasers / infrared lasers / electron linacs / high-brightness electron beams / spontaneous emission |
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| Research Abstract |
1.Amplifier FEL
In free-electron laser (FEL) amplifier experiments self-amplified spontaneous emission from a high brightness single-bunch beam has been observed at wavelengths of 20 and 40 mum. The characteristics of the radiation have been measured. The fundamental processes of the amplification have been investigated by changing the charge of electrons per bunch. We also have succeeded in the generation of high-brightness two-bunch electron beams which possibly generate high-power FEL by twice amplification under the configuration of an optical resonator.
2. Oscillator FEL
The characteristics of the multibunch beams have been measured. The intensity of the spontaneous emission at a resonant wavelength of 40 mum has been found to be about three times of that of the incoherent emission after amplification. The amplification under resonance in the optical cavity has not been observed so far. The quality of the beam has been improved by using a low-emittance electron gun, which would strongly improve the conditions for the oscillator experiments.
3.Development of a FEL light source
The pulse width of the infrared FEL is estimated to be 20 ps. The sensitivity of the detector of light has been evaluated with a blackbody light source and the radiation from an undulator. The transport system of the radiation from the accelerator room to outside and the detection system have been established.
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