1989 Fiscal Year Final Research Report Summary
Research on Free Electron Laser Using Dielective Resonance
| Project/Area Number |
63580009
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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 |
プラズマ理工学
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| Research Institution | Institute of Laser Engineering Osaka University |
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Principal Investigator |
MIMA Kunioki Osaka Univ., Institute of Laser Engineering Professor, レーザー核融合研究センター, 教授 (30033921)
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| Co-Investigator(Kenkyū-buntansha) |
TAKABE Hideaki Osaka Univ., Institute of Laser Engineering Lecturer, レーザー核融合研究センター, 講師 (20150352)
KATO Yoshiaki Osaka Univ., Institute of Laser Engineering Professor, レーザー核融合研究センター, 教授 (30093397)
IMASAKI Kazuo Institute of Laser Technology, Associate Professor, 部長 (40115994)
KITAGAWA Yoneyoshi Osaka Univ., Institute of Laser Engineering Professor, レーザー核融合研究センター, 助教授 (40093405)
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| Project Period (FY) |
1988 – 1989
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| Keywords | Free Electron Laser / Electron Beam / Wiggler / Dielectric Resonance / Molecular Transition / Optical Cavity / Visible Radiation / UV |
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| Research Abstract |
In a conventional free electron laser (FEL), it is necessary to use an energy electron beam (higher than 100MeV), in order to operate it in the visible or shorter wavelength range. Therefore, the sue of the visible FEL will be larger. This is one of the most serious disadvantages for FEL. The main objective of this research is to reduce the necessary beam energy and to reduce the size of a visible FEL by loading a gas in a optical cavity in a wiggler. When the refractive index is n^^- in the gas, the phase velocity is c/n^^- and the reconance condition for FEL is then lambda=(l/n^^--nuz/c)lambdaw. Here, lambdaw is the wiggler wavelength, lambda is the radiation wavelength, and nuz is the axial velocity in the wiggler. When n is greater than 1.001, a 10MeV electron beam will generate visible or ultra-violet radiations. It there is not dielectric resonance for a loaded gas, the required gas pressure will be higher than 100torr. When the gas pressure is as high as this level, the electron beam is scatlered by the gas molecules and degrated in the quality (energy spread and emittance).
We proposed the use uf an appropriate dielectric resonce between the FEL radiation and the molecular transitions in order to reduce the gas pressure from 100torr to 10torr. In order to evaluate the application rate in an dielectrically resonant gas FEL, we investigated the radiation propagation equation in a near resonance media, namely the Bloch equation with the electron beam brewsstrahlung. As a result, we found that enough rate can be obtain for moderate electron beam and wiggler parameters.
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