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Figure 6
Taper scheme adopted to maintain the resonance condition of a chosen radiation slice. (a) The tapered undulator parameter distribution calculated according to the enhanced chirp resulting from the longitudinal field. The profile is the linearly fitted result of each undulator calculated according to the resonant condition. (b) Distribution of the resonant wavelength calculated (contour map) along the bunch and the undulator position in the lasing process. The trajectory of the chosen radiation slice is represented by the solid magenta line. The normalized power evolution of a typical ultrashort pulse lasing process is also displayed, of which the peak finally overlaps with the chosen radiation slice.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
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