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We are developing an FEL (Free-Electron Laser) facility gKU-FELh (Kyoto University FEL) as a key facility for the R&D of the future energy systems. The KU-FEL is to be realize a compact, economical, and easy-to-operate FEL system which provides coherent and tunable laser in IR region.
The FEL system has been almost completed in the Laboratory for Photon and Charged Particle Reserch.
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For the first step, the KU-FEL is designed to achieve FEL lasing from 4 to 13 μm. The tunable IR laser will be used for basic study of high-efficiency solar cells, generation of sustainable energy source, separation of DNA and/or RNA, etc.
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Left figure shows estimated laser power in KU-FEL. Estimated power from the present configuration, from the future upgrade of the undulator, photocathode rf gun, and from a commercially available OPO device are shown.
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A 4.5 cell S-band thermionic rf gun has been developed as an electron injector. This device can generate high-brightness electron beam of 9 MeV energy with long macro-pulse (up to 5 μsec) from its compact body of 236 mm.
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The S-band accelerator tube ( 2.9-m effective length) accelerates electron beam up to 40 MeV by using 20 MW RF power.
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The undulator length is 1.6 m, the period is 40 mm, the number of period is 40, and undulator parameter, K-value, is 0.95`0.17. The FEL wavelength from 4 to 13 μm is expected with the present system with electron-beam energy from 20 to 40 MeV.