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Figure 6
Top: the transverse position of electrons at the exit of the radiator versus longitudinal coordinate internal to the bunch. The energy-modulated electrons separate from the beam core at a positive lateral distance >250 µm from the reference trajectory. At the radiator location there is no angular separation because the derivative of the energy dispersion function is zero (see Fig. 1[link], lower plot). Bottom: number of electrons versus relative energy deviation, normalized to the number of particles on-energy. The fraction of particles with a positive p-factor > 5 is approximately 0.5%.

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