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000000204 0247_ $$2arXiv$$aarXiv:1502.04627
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000000204 088__ $$aDESY-15-021; arxiv:1502.04627
000000204 245__ $$aTheoretical Computation of the Polarization Characteristics of an X-ray Free-Electron Laser with Planar Undulator
000000204 260__ $$c2015
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000000204 520__ $$aWe show that radiation pulses from an X-ray Free-Electron Laser (XFEL) with a planar undulator, which are mainly polarized in the horizontal direction, exhibit a suppression of the vertical polarization component of the power at least by a factor $\lambda_w^2/(4 \pi L_g)^2$, where $\lambda_w$ is the length of the undulator period and $L_g$ is the FEL field gain length. We illustrate this fact by examining the XFEL operation under the steady state assumption. In our calculations we considered only resonance terms: in fact, non resonance terms are suppressed by a factor $\lambda_w^3/(4 \pi L_g)^3$ and can be neglected. While finding a situation for making quantitative comparison between analytical and experimental results may not be straightforward, the qualitative aspects of the suppression of the vertical polarization rate at XFELs should be easy to observe. We remark that our exact results can potentially be useful to developers of new generation FEL codes for cross-checking their results.
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000000204 7001_ $$0P:(DE-H253)PIP1000427$$aGeloni, Gianluca$$b0$$eCorresponding Author
000000204 7001_ $$0P:(DE-H253)PIP1002248$$aKocharyan, Vitali$$b1$$udesy
000000204 7001_ $$0P:(DE-H253)PIP1001658$$aSaldin, Evgeny$$b2$$udesy
000000204 8560_ $$fjulika.wagner@desy.de
000000204 8564_ $$uhttp://arxiv.org/abs/1502.04627
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