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(a) Simulated temporal dispersion for electron bunches emitted from a guard ring cathode containing increasing number of photoelectrons at 50 V Wehnelt bias. (b) Simulated electron energy distribution for a 10 000 electron bunch in a relative time domain (at 50 V bias) immediately after the limiting aperture. The electrons are color coded according to their initial normal velocity in m/s. (c) Energy spectrum obtained projecting the electrons in (b) onto the energy dimension.
