Project for generation of femtosecond X-ray beams from the DUKE storage ring

We propose to develop a CW X-ray femtosecond (fsec) source at 1.2 GeV Duke storage ring with the X-ray energy tuneable from 1.4 keV to 75 keV, the average flux from 10¹² to 10¹³ ph/sec, and the average spectral brightness up to 0.510¹⁵ ph/sec/mm ²/mrad²/0.1%BW. A novel RF system with strong longitudinal focusing will compress and to sustain the electron bunches circulating in the ring to a RMS duration from 15 to 85 fsec. The CW fsec electron bunches will generate the Compton hard-X-ray beams and the photon beams from the existing light sources ranging form IR to VUV. Beams of all colours will be synchronised by the e-beam without jitter, making this configuration perfectly suites for pump-probe experiments. The proposed approach promises to outperform the popular "slicing technique" by at least three orders of magnitude. Duke\´s approach can be implemented at existing light source facilities at modest cost