Salient features of using a free-electron laser with a crossed fluted cavity for generating coherent tunable gamma radiation

A new way of generating high-power tunable coherent gamma radiation in a fr ee electron laser with a crossed fluted cavity is proposed. The gamma rays are generated in the inverse Compton scattering of intracavity radiation on the electron beam of the free-electron laser. The use of a crossed fluted cavity makes it possible to raise substantially the intracavity power and t hereby the power of the gamma radiation and also to solve the problem of ex traction of the hard radiation while eliminating the hitherto unavoidable l osses in passage through the material of the cavity mirror. (C) 1999 Americ an Institute of Physics. [S1063-7850(99)03105-5].