Application of FEL technique for constructing high-intensity, monochromatic, polarized gamma-sources at storage rings

The possibility to construct a high-intensity tunable monochromatic γ-source at high energy storage rings is discussed. It is proposed to produce γ-quanta by means of Compton backscattering of laser photons on electrons circulating in the storage ring. The laser light wavelength is chosen in such a way that after the scattering, the electron does not leave the separatrix. Analysis of parameters of existent storage rings (PETRA, ESRF, Spring-8, etc.) shows that the laser light wavelength should be in the infrared, λ ∼ 10–400 μm, wavelength band. Installation at storage rings of tunable free electron lasers with the peak and average output power ∼10 MW and ∼1 kW, respectively, will result in the intensity of the γ-source up to ∼1014 s1 with a tunable γ-quanta energy from several MeV up to several hundreds MeV.