A mono-energetic tunable source of 100% linearly polarized γ rays has been developed at the Duke Free-Electron Laser Laboratory in conjunction with Triangle Universities Nuclear Laboratory. The OK-4 FEL is coupled to a 1-GeV electron storage ring and generates intense beams of visible or UV photons. In γ-ray production mode, the OK-4 photons Compton scatter from high-energy electrons inside the optical cavity leading to backscattered γ rays. The strong correlation between scattering angle and y-ray energy permits a selection of the energy spread of the γ-ray beam that depends on a simple geometrical aperture located along the optical axis. Results obtained/(design parameters) indicate γ-ray beams with energies of 2.2-58/(2.0-175) MeV, ΔE/E<1.0% and total fluxes greater than 10~7/(10~(10)) γ rays/s.
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机译：杜克自由电子激光实验室与三角大学核实验室共同开发了一种100％线性偏振γ射线的单能可调光源。 OK-4 FEL耦合到1-GeV电子存储环，并产生可见光或UV光子的强光束。在γ射线产生模式下，OK-4光子康普顿从光学腔内部的高能电子散射而导致反向散射的γ射线。散射角和y射线能量之间的强相关性允许选择γ射线束的能量散布，该散布取决于沿光轴定位的简单几何孔径。获得的结果/（设计参数）表明能量为2.2-58 /（2.0-175）MeV，ΔE/ E <1.0％且总通量大于10〜7 /（10〜（10））的γ射线/ s。
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