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Persistent URL http://purl.org/net/epubs/work/28578628
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Record Id 28578628
Title Modelling elliptically polarised free electron lasers
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.
Organisation ASTeC , CI , STFC
Funding Information EPSRC (EP/K000586/1); EPSRC (EP/M011607/1); STFC (Agreement Number 4163192 Release #3); John von Neumann Institute for Computing on JUROPA at Julich Supercomputing Centre (HHH20)
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Language English (EN)
Type Details URI(s) Local file(s) Year
Journal Article New J Phys 18, no. 6 (2016): 062003. doi:10.1088/1367-2630/18/6/062003 2016