Abstract
Summary form only given. The SNOW code (for ion beams) and the SPEED code (for relativistic electron beams) have been combined into one FORTRAN 77 program for simulation of any type of axisymmetric or 2-D particle beam on a PC. PBGUNS uses relaxation techniques to do a Poisson simulation of both electron and ion beams of any energy in axisymmetric or rectangular configurations. It uses quadratic equations to simulate electrode boundaries on a rectangular mesh of squares. A typical input data set is between 15 and 40 lines long. A fine mesh automatically covers the cathode and/or plasma region to improve the accuracy of the calculations and to obtain excellent agreement with either theory or experiment. Results are presented for a microperveance 1.9 electron gun. The microperveance was easily obtained with no thermal effect.
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