Abstract
Laser-plasma based accelerator has the potential to dramatically reduce the size and cost of future x-ray light sources to the university-laboratory scale. However, the large energy spread of the laser-plasma accelerated electron beam may hinder the way for short wavelength free-electron laser generation. In this paper, we propose a novel method for directly imprinting strong coherent micro-bunching on the electron beam with large intrinsic energy spread by using a wavefront-tilted conventional optical laser beam and a weak dipole magnet. Theoretical analysis and numerical simulations demonstrate that this technique can be used for the generation of fully coherent femtosecond soft x-ray radiation at gigawatts level with a very short undulator.
Highlights
LPA based FEL and problems CHG with angular modulation Inducing angular modulation with a normal seed laser pulse
The angular modulation can be converted into density modulation by a weak dipole
angular modulation amplitude is much smaller than the initial beam energy spread
Summary
The optimized gain length reduction for longitudinal dispersion and transverse dispersion. The output power of coherent harmonic radiation (CHG) is insensitive to the beam energy spread: PCHG. Radiator length is very short ~2 gain lengths.
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