Modelling elliptically polarised free electron lasers

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Henderson, J R 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. 062003. ISSN 1367-2630 (https://doi.org/10.1088/1367-2630/18/6/062003)

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Abstract

A model of a Free Electron Laser 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 signifcantly different evolution between the averaged and unaveraged simulations of the harmonic radiation evolution approaching FEL saturation.

ORCID iDs

Henderson, J R, Campbell, L T ORCID logoORCID: https://orcid.org/0000-0003-1375-1551, Freund, H P and McNeil, B W J ORCID logoORCID: https://orcid.org/0000-0002-7267-611X;
  • Item type:Article
    ID code:56653
    Dates:
    Date
    Event
    20 June 2016
    Published
    6 June 2016
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:14 Jun 2016 12:49
    Last modified:26 Nov 2024 01:10
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/56653
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