Physics – Accelerator Physics
Scientific paper
2011-12-02
Physics
Accelerator Physics
12 pages, 4 figures
Scientific paper
General formalism for describing dynamics of modulated beams along linear beamlines is developed. We describe modulated beams with spectral distribution function which represents Fourier transform of the conventional beam distribution function in the 6-dimensional phase space. The introduced spectral distribution function is localized in some region of the spectral domain for nearly monochromatic modulations and it can be characterized with a small number of typical parameters which we choose to be the lowest order moments of the spectral distribution. We study evolution of modulated beams in linear beamlines and find that characteristic spectral parameters transform linearly. The developed approach significantly simplifies analysis of various schemes proposed for seeding X-ray free electron lasers. We use this approach to study several recently proposed schemes and find the bandwidth of the output bunching in each case.
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