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, 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%. |