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The propagation dynamics of space-charge-limited femtosecond electron pulse, propagating in a photoelectron gun, were investigated. The experiment involved the use of an analytical approach based on mean-field theory and a numerical N-body simulations for studying the electron space-charge dynamics in an ultrafast electron packet. The experimental results when compared with the fluid model concluded that the fluid model overestimated the pulse duration after a certain propagation time.

Comment on “Ultrafast electron optics: Propagation dynamics of femtosecond electron packets” [J. Appl. Phys. 92, 1643 (2002)]