Unaveraged modelling of a LWFA driven FEL

Campbell, L T. and Maier, A. R. and Gruener, F. J. and McNeil, B W. J. (2013) Unaveraged modelling of a LWFA driven FEL. In: FEL 2013. JACoW, pp. 43-46. ISBN 9783954501267

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    Abstract

    Preliminary simulations of a Laser Wakefield Field Accelerator driven FEL are presented using the 3D unaveraged, broad bandwidth FEL simulation code Puffin. The radius of the matched low emittance electron beam suggests that the FEL interaction will be strongly affected by radiation diffraction. The parameter scaling and comparison between 3D and equivalent 1D simulations appears to confirm the interaction is diffraction dominated. Nevertheless, output powers are predicted to be greater than those of similar unaveraged FEL models. Possible reasons for the discrepancies between the averaged and unaveraged simulation results are discussed.