Fig. 8: Simulation of the plasma results obtained with Hydrogen30.
From: Recovery of hydrogen plasma at the sub-nanosecond timescale in a plasma-wakefield accelerator

Trajectories (red) of the ions after the initial attraction operated by the electron beam (at t = 0). The initial density is set to np = 6 × 1018 cm−3. The beam and plasma parameters are provided in the reference work.