Conceptual arrangement for generation of a free-electron laser (FEL): When a high-brightness electron beam goes through an undulator with a light beam, it is micro-bunched through interaction with the electromagnetic field of light, and the light beam is amplified to become a coherent laser. The FEL is widely tunable even in the wavelength region where conventional lasers cannot reach.
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Conceptual drawing of a compact and economical free-electron laser system: Free-electron laser is regarded as a light source of the next generation because of its wide wavelength tunability, potential high efficiency and high power, and possibility of lasing at wavelength regions where the conventional lasers cannot reach. However, the system is much bigger than conventional lasers and the cost is higher. We are going to overcome these difficulties by exploiting a photocathode RF(radio-frequency) gun, energy recovering system, etc.
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| Schematic drawing of a RF gun and electron-beam diagnostic system: An electron beam has been generated by a RF gun, and the beam characteristics are now being measured by the use of a bending magnet, fluorescent plates, CCD cameras, etc. |  |
Institute of Adbanced Energy, Kyoto University
Kyoto University