Monte-Carlo calculation of Boersch energy spreading

The effects of electron-electron coulomb interactions have been simulated by a general computational technique that can be applied to almost any system, independently of the shape of the beam or the regimes that might be present, provided that the 'closest-encounter' approximation is valid for the system. The technique has been applied to the 'benchmark test' of the energy spreading in a converging round beam. The results are compared with previous analytical results