Abstract
A mid-infrared free electron laser (MIR-FEL) (target wavelength: 5 ~ 20 μm) facility named KU-FEL (Kyoto University Free Electron Laser) was constructed to aid various energy science researches at the Institute of Advanced Energy, Kyoto University. In December 2011, KU-FEL was upgraded by replacing its undulator and optical cavity mirrors. By this upgrade, the tunable range of KU-FEL was improved to 5.5 ~ 15 μm. According to replacing the cavity mirrors, size and divergence of FEL beam at the emitting point was changed. Therefore, we designed and constructed a new MIR-FEL transport line. By using calculation code Zemax (http://www.zemax.com), the condition for keeping the FEL beam radius less than 25 mm during the transportation length of 24 m was determined. In addition, the FEL intensity profile was measured after passing through the constructed transport line. The beam waist at the out-coupling hole was calculated from the measured FEL intensity profile. By using the beam waist calculated from the measurement, we confirmed the validity of the calculated optimum condition.
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Acknowledgment
This work was supported by the Kyoto University’s Global Center of Excellence (GCOE) program of the Graduate School of Energy Science in the Age of Global Warming.
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Yoshida, K. et al. (2013). Optimization of the New Designed FEL Beam Transport Line. In: Yao, T. (eds) Zero-Carbon Energy Kyoto 2012. Green Energy and Technology. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54264-3_22
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DOI: https://doi.org/10.1007/978-4-431-54264-3_22
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