Author: Nguyen, D.C.
Paper Title Page
Regenerative Laser Undulator X-ray Free-Electron Laser (ReLUX-FEL)  
  • D.C. Nguyen, P.M. Anisimov, B.E. Carlsten
    LANL, Los Alamos, New Mexico, USA
  • J.E. Lawler
    UW-Madison/PD, Madison, Wisconsin, USA
  Funding: LA-UR-14-22951
We present a new high-gain x-ray FEL concept based on a nearly co-propagating sheared laser undulator [1] and regenerative amplification [2,3] of a single x-ray pulse via successive interactions between a single electron bunch and the same laser undulator pulse. This new x-ray FEL configuration is called the Regenerative Laser Undulator X-ray FEL which uses a relativistic electron beam crossing a sheared TW laser beam at small angles. The generated x-ray pulse follows a zigzag path between Bragg reflectors and repetitively interacts with the laser and electron pulses. Between interactions, the electron bunch is advanced longitudinally to maintain its overlap with the x-ray pulse. The laser pulse follows a different path that includes an optical delay to synchronize it with the electron and x-ray pulses. The laser wave-front tilt and width are designed to increase the interaction time to provide many oscillation cycles. We present a ReLUX-FEL that can produce coherent 12-keV photons with 2 GeV electron beams. Time-independent Genesis simulations show that with 3 kA peak current and an FEL rho of 0.0007, the ReLUX-FEL saturates after 12 interactions.
[1] J.E. Lawler et al., J. Phys. D: Appl. Phys. 46 (2013) 325501.
[2] D.C. Nguyen et al., NIMA 429 (1999) 125.
[3] Z. Huang et al., PRL 96 (2006) 144801
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