Modelling elliptically polarised free electron lasers

Henderson, James Robert and Campbell, L. T. and Freund, H. P. and McNeil, B. W. J. (2016) Modelling elliptically polarised free electron lasers. New Journal of Physics, 18. ISSN 1367-2630

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Abstract

A model of a free electron laser (FEL) operating with an elliptically polarised undulator is presented. The equations describing the FEL interaction, including resonant harmonic radiation fields, are averaged over an undulator period and generate a generalised Bessel function scaling factor, similar to that of planar undulator FEL theory. Comparison between simulations of the averaged model with those of an unaveraged model show very good agreement in the linear regime. Two unexpected results were found. Firstly, an increased coupling to harmonics for elliptical rather than planar polarisarised undulators. Secondly, and thought to be unrelated to the undulator polarisation, a significantly different evolution between the averaged and unaveraged simulations of the harmonic radiation evolution approaching FEL saturation.

Item Type:
Journal Article
Journal or Publication Title:
New Journal of Physics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
80943
Deposited By:
Deposited On:
16 Aug 2016 13:44
Refereed?:
Yes
Published?:
Published
Last Modified:
18 Nov 2020 04:10