Nonlinear Harmonic Generation in Multi-Stage Optical Klystrons

(TU-3-13)

H.P. Freund and G.R. Neil  

SAIC and Thomas Jefferson National Accelerator Facility

A multi-stage optical klystron (MSOK) has the potential for dramatically shortening the total interaction length in high-gain free-electron lasers; however, it is more sensitive to energy spread than a single-wiggler-segment configuration. In order to overcome this limitation, we consider a device that relies on both the MSOK and nonlinear harmonic generation to reach the desired wavelength [1]. This permits the use of lower beam energies and relaxes the requirements on beam emittance and energy spread. An example of a 1.5 $\dot{A}$ source corresponding to the Linac Coherent Light Source at the Stanford Linear Accelerator Center is discussed.

[1] H.P. Freund, S.G. Biedron, and S.V. Milton, IEEE J. Quantum Electron. 36, 275 (2000).