| Project/Area Number |
17360039
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied physics, general
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| Research Institution | Institute for Molecular Science |
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Principal Investigator |
KATOH Masahiro Institute for Molecular Science, UVSOR Facility, Professor (30185871)
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| Co-Investigator(Kenkyū-buntansha) |
MOCHIHASHI Akira Institute for Molecular Science, UVSOR Facility, Assistant Professor (10342635)
SHIMADA Miho Institute for Molecular Science, UVSOR Facility, Researcher (10442526)
HOSAKA Masahito Nagoya University, Graduate School of Engineering, Associate Professor (60290897)
TAKASHIMA Yoshifumi Nagoya University, Graduate School of Engineering, Associate Professor (40303664)
KIMURA Shin-ichi Institute for Molecular Science, UVSOR Facility, Associate Professor (10252800)
高橋 俊晴 京都大学, 大学院・原子炉実験所, 助手 (00273532)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥12,420,000 (Direct Cost: ¥11,700,000、Indirect Cost: ¥720,000)
Fiscal Year 2007: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2006: ¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 2005: ¥4,600,000 (Direct Cost: ¥4,600,000)
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| Keywords | terahertz / light source / accelerator / applied optics / synchrotron radiation / electron beam / coherent / laser / レーザー / シンクロトロン光 / コヒーレント / 放射光 / 電子蓄積リング / ミリ波 / 量子ビーム |
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| Research Abstract |
We have succeeded in producing coherent synchrotron radiation in the terahertz region by using relativistic electron bunches with micro-density structures. The micro-structures were created by a newly developed method, which utilize the interaction between electrons and laser field. Electrons traveling with laser pulse in alternating magnetic field can exchange their energy with laser field under some resonant condition. As the result, an energy modulation is created on the electron bunch. This energy modulation is converted to a density modulation as the electron bunch is proceeding in the accelerator, as the result of the energy dependence of the path length. Such system has been constructed on the UVSOR-II electron storage ring in Institute for Molecular Science.
We have successfully demonstrated that an electron bunch with a single dip structure of sub-picosecond width emitted intense broadband coherent THz pulse. The dip structure was created by injecting femtosecond laser pulses into the storage ring.
We have also demonstrated that an electron bunch with a periodic micro-structure of a sub-picosecond period emitted narrowband coherent THz pulse. In this case, amplitude modulated laser pulses are injected into the ring, which were created by newly developed system in collaboration with a research group of Lille University France. It is well known that synchrotron radiation is extremely broadband from radio-wave to X-rays. This is the first experimental result that monochromatic synchrotron radiation is extracted from a uniform magnetic field. By changing the period of the microstructure, we could change the radiation wavelength.
The results have indicated the possibility to control the amplitude and the phase of synchrotron radiation. The developed method can be realized most of the existing synchrotron light sources.
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