Abstract:
A mono-energetic tunable source of 100% linearly polarized y
rays has been developed at the Duke Free- Electron Laser
Laboratory in conjunction with Triangle Universities Nuclear
Laboratory. The OK-4 PEL is coupled to a 1-GeV electron
storage ring and generates intense beams of visible or UV
photons. In y-ray production mode, the OK-4 photons Compton
scatter from high-energy electrons inside the optical cavity
leading to backscattered y rays. The strong correlation
between scattering angle and y-ray energy permits a
selection of the energy spread of the y-ray beam that
depends on a simple geometrical aperture located along the
optical axis. Results obtained/(design parameters) indicate
yray beams with energies of 2.2-587(2.0-175) MeV, AE/E<1.0%
and total fluxes greater than 107/(1010) y rays/s.
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