Abstract
We propose the FEL-X project which aims at hard X-ray generation through free electron laser (FEL) Compton backscattering in the storage ring NIJI-IV. The target energy of the hard X-rays is 0.1–1 MeV where conventional light sources cannot provide the sufficient amounts of photons. In order to obtain such hard X-ray beams, it is necessary to generate an infrared FEL in the wavelength range of about 1–10 µm. We just modify a 3 m planar undulator to a 3.55 m optical klystron. This new optical klystron has two undulator sections of 7 periods of 20 cm and one 75 cm dispersive section including two 1.5 cm free spaces. The maximum FEL gain at 10.6 µm is estimated to be over 2% and FEL oscillations would be achieved at around 10 µm. It would be also possible to lase with higher harmonics emitted from the optical klystron in the wavelength range of 1–3 µm.
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