VlaPlEx (Vlasov Plasma Expansion) code aims to provide a simple way to solve the collisionless plasma expansion into a vacuum.

It solves the Vlasov equation for ions in a 1D spherical domain.

Electrons are treated as a fluid either isothermal (Boltzmann) or polytropic.

Self-consistent electric field is solved using a Newton-Raphson method to solve the Poisson equation.