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Numerical Simulations of X-Ray Free Electron Lasers (XFEL)

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posted on 2016-01-11, 10:48 authored by Agisilaos Athanassoulis, P. A. Markowich, P. Antonelli, Z. Huang
We study a nonlinear Schrödinger equation which arises as an effective single particle model in X-ray free electron lasers (XFEL). This equation appears as a first principles model for the beam-matter interactions that would take place in an XFEL molecular imaging experiment in [A. Fratalocchi and G. Ruocco, Phys. Rev. Lett., 106 (2011), 105504]. Since XFEL are more powerful by several orders of magnitude than more conventional lasers, the systematic investigation of many of the standard assumptions and approximations has attracted increased attention. In this model the electrons move under a rapidly oscillating electromagnetic field, and the convergence of the problem to an effective time-averaged one is examined. We use an operator splitting pseudospectral method to investigate numerically the behavior of the model versus that of its time-averaged version in complex situations, namely the energy subcritical/mass supercritical case and in the presence of a periodic lattice. We find the time-averaged model to be an effective approximation, even close to blowup, for fast enough oscillations of the external field. This work extends previous analytical results for simpler cases [P. Antonelli, A. Athanassoulis, H. Hajaiej, and P. Markowich, Arch. Ration. Mech. Anal., 211 (2014), pp. 711--732].

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Citation

SIAM: Multiscale Modeling and Simulation, 2014, 12(4), pp. 1607-1621 (15)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Mathematics

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  • VoR (Version of Record)

Published in

SIAM: Multiscale Modeling and Simulation

Publisher

Society for Industrial and Applied Mathematics

issn

1540-3459

eissn

1540-3467

Acceptance date

2014-08-05

Copyright date

2014

Available date

2016-01-11

Publisher version

http://epubs.siam.org/doi/abs/10.1137/130927838

Language

en

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