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Generating femtoseconds electron bunches is critical for X-ray free electron laser, laser accelerators and many other applications. Computer simulation of ultra-short (10–100fs, rms) kilo-ampere electron bunch production from a photocathode injector are presented in this report. The electron beam is produced by an 8ps (FWHM) laser from a photocathode RF gun injector operating at the longitudinal emittance...