Modeling of Coulomb interaction in an axially symmetric inhomogeneous beam of charged particles

A mathematical model of an axially symmetric inhomogeneous beam of charged particles is considered. It is proposed to represent a beam as a set of charged hollow cylinders being in the circular metal tube of a constant radius. It is proposed to simulate the function of the beam charge density by an analytical function. By solving a boundary value problem for the Poisson equation the analytical formulas for intensity of the electrostatic field of a charged particle beam are obtained.