2013 Fiscal Year Final Research Report
terahertz spectroscopy based on the coherent Cherenkov radiation emitted from femto-second electron bunch
| Project/Area Number |
21540514
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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 |
Plasma science
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| Research Institution | Kansai University |
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Principal Investigator |
ASAKAWA Makoto 関西大学, システム理工学部, 教授 (30280704)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAGUCHI Soichiro 関西大学, システム理工学部, 准教授 (30413991)
TSUNAWAKI Yoshiaki 大阪産業大学, 工学部, 教授 (90030056)
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| Project Period (FY) |
2009-04-01 – 2014-03-31
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| Keywords | 応用光学・量子光工学 / 量子ビーム / 粒子線 / テラヘルツ／赤外材料・素子 |
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| Research Abstract |
A novel terahertz spectroscopy method has been investigated. The method is based on two phenomena: the coherent radiation emitted from the ultra-short electron bunch and Cherenkov radiation induced by electron passing vicinity of the surface of dielectric materials. Coherent Cherenkov radiation is produced when the electron velocity exceeds the phase velocity of the radiation inside the dielectrics.
Development of a 100 femto-second photoinjector revealed that the saturation current density was much higher than that of the long-pulsed electron gun, and the remarkable elongation of the electron bunch length under the saturation. In the study of the radiation, the threshold acceleration voltage for the generation of the Cherenkov radiation was observed. Measured threshold was agreed well with the theoretical prediction. We conclude that the principle of the Coherent Cherenkov radiation spectroscopy could be demonstrated.
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