Transverse Coherence of Self-Ampli ed Spontaneous Emission
نویسنده
چکیده
Transverse coherence of Self-Ampli ed Spontaneous Emission (SASE) in high gain FELs is investigated through a three-dimensional eigenmode analysis. It is the rst time such an analysis could be carried out to account for the e ects of emittance and betatron focusing. In addition to the variational solution [1] found for the fundamental mode, E00, similar solutions are derived here for two higher order eigenmodes, E10 and E01. Based on the growth rates of these three modes, a universal criteria on transverse coherence of SASE is proposed.
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تاریخ انتشار 1999