SIMM1 - A Linearized Particle Code

Abstract

SIMM1 is a linearized particle simulation code used to study the resistive hose instability of a self-pinched, relativistic electron beam propagating in resistive plasma. The code treats the zero-order axisymmetric beam dynamics as a group of macroparticle rings. The particle dynamics associated with the hose perturbations is represented by linearized displacements of these rings from the beam axis and by bunching of the charge density around the ring. The linearization procedure presents difficulties which must be dealt with to determine the long-time behavior of the system. The axisymmetric motion of the rings occurs under the influence of an anharmonic central potential which leads to secular behavior of the orbit perturbations. We have developed a method of course graining to deal with the problem of secularities. Originator-supplied keywords include: Relativistic electron beam and Hose instability.