The numerical simulation by 2.5D code LCODE of properties and excitation of wakefield bubble of plasma electrons by short dense bunch of relativistic electrons has been performed in this paper. It has been shown that abrupt back front of bubble becomes less abrupt at decrease of bunch-driver length. Abrupt back front of bubble becomes more abrupt at increase of bunch-driver current. At bubble excitation by short electron bunch with not very large density bubble can be formed in the second wavelength and bubble is not formed in the first wavelength. At larger bunch density the bubble is not formed in the first wavelength on small time and it can be formed on large time. The bunch focusing by bubble becomes more homogeneous with growth of bunch current.

• Оніщенко Іван Миколайович (1936–) (фізико-математичні науки)

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