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| TUPPH022 |
Development of a Compact Cherenkov Free-Electron Laser in Terahertz Spectral Range
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364 |
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- M. R. Asakawa, N. Miyabe
Kansai University, Osaka
- M. Kusaba, K. Nakao, Y. Tsunawaki
OSU, Daito, Osaka
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A Cherenkov free-electron laser (CFEL) generating terahertz radiation is now being developed under the joint research of Osaka Sangyo university and Kansai university. The main feature of this CFEL is its compactness. Electron beamlets emitted by a Spindt cathode are accelerated up to 60 keV in a D. C. electron gun and then are injected into 100μm-gaps between stacked plates of silicon, which acts as radiator. The radiation frequency will be ranged from 0.8 to 2 THz according to the acceleration voltage. In order to suppress diverging of the beamlet with a high current density about 1kA/cm2, the electron gun and the radiator section are immersed in a longitudinal magnetic field produced by a super-conducting (SC) coil. The total length of the CFEL section, i.e., the distance between the cathode and beam dumper, is 4 cm and the diameter of this section is less than 2 cm. Such compact laser module is placed in the bore of SC coil. In spite of the large size of the cryostat and the power supply of the SC coil, the total footprint is about 1×1 m2.
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