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Figure 7
Bunching factor at 20 THz of the THz bunch at the entrance of the undulator for different laser pulse length and injection time offset. The beam charge is 100 pC (a), 200 pC (b) and 300 pC (c). The black circle represents the nominal 100 pC FEL bunch and the white crosses represent the optimal points for each beam charge, whose longitudinal phase space is shown in Fig. 8[link]. The bunching factors along the dashed line in (b) at 12 ps injection time offset are presented in Fig. 9[link].

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 27| Part 4| July 2020| Pages 890-901
https://doi.org/10.1107/S1600577520005147
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