| Paper | Title | Page |
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| MOPPH048 | Free-Electron Laser Options for the Energy-Recvory Linac Light Source in Japan | 87 |
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A research and development program towards a future X-ray light source based on an energy-recovery linac (ERL) has been launched in Japan. The program is underway by collaboration team consisting of KEK, JAEA, ISSP, and other institutes. Since the ERL produces an electron beam of ultimately small emittance with a high repetition rate (MHz - GHz), it is a suitable device to operate a FEL oscillator in addition to spontaneous radiation from undulators. We are investigating possible FEL options both in the ERL test facility under construction (60MeV-200MeV) and a future ERL light source (>5GeV). Following the proposal of XFEL oscillator using Bragg reflectors*, we have conducted a 1D time-dependent simulation to study longitudinal mode evolution in an XFEL oscillator. The simulation shows that narrow-band FEL lasing in hard X-ray wavelength region is established by Bragg reflectors, and even a single supermode operation is possible by choosing appropriate cavity-length detuning.
* K-J. Kim et al., ‘‘1-A FEL Oscillator Using ERL Beams'', ERL-07 Workshop, Daresbury, May, 2007. |