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Figure 10
(a) Regarding the cascaded EEHG with harmonic 2000, averaged βx,y = 5 m and Ipeak = 200 A, the radiator-2 is set to lase in the fundamental with an undulator period of 10 mm; the peak power as a function of the undulator distance is shown for the optimal detuning case with Ku,helical = 1.1770 with additionally optimized tapering (black), SASE1 with optimized tapering and equilibrium energy spread 8 × 10−4 (blue), and SASE2 with optimized tapering and doubled energy spread 1.6 × 10−3 (green). (b) Ratio of CR peak powers for two cases – prebunching with SASE1 ([\Delta{E}/E] = 8 × 10−4) (black) and SASE2 ([\Delta{E}/E] = 1.6 × 10−3) with SASE1 (red), as a function of undulator distance. (c) The tapering (k versus z) is plotted. (d) 3D gain length (LG) as a function of the RMS energy spread in units of MeV. (e) LG as a function of βx,y with two different RMS energy spreads, 4 MeV (black) and 8 MeV (red). (f) Contour of 3D gain length as functions of βx,y in x and RMS energy spread σE in y.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 30| Part 5| September 2023| Pages 861-875
https://doi.org/10.1107/S1600577523006586
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