Title: Effect of ion motion on relativistic electron beam driven wakefield in a cold plasma,
Abstract: Excitation of relativistic electron beam driven wakefield in a cold plasma is
studied using 1-D fluid simulation techniques where the effect of ion motion is
included. We have excited the wakefield using a ultra-relativistic,
homogeneous, rigid electron beam with different beam densities and mass-ratios
(ratio of electron's to ion's mass). We have shown that the numerically excited
wakefield is in a good agreement with the analytical results of Rosenzweig et
al. \textcolor{blue}{[Physical Review A. 40, 9, (1989)]} for several plasma
periods. It is shown here that the excited wake wave is equivalent to the
corresponding "Khachatryan mode" \textcolor{blue}{[Physical Review E. 58, 6,
(1998)]}. After several plasma periods, it is found that the excited wake wave
gradually modifies and finally breaks, exhibiting sharp spikes in density and
sawtooth like structure in electric field profile. It is shown here that the
excited wake wave breaks much below the Khachatryan's wave breaking limit.