XMAGUN: An iron pole piece PPM design and analysis FEM code

An analysis of an iron pole piece PPM code based on the Finite Element Method (FEM) for traveling-wave-tube (TWT) design is presented. The XMAGUN was developed to determine the axial and radial magnetic fields inside such devices. During simulations, the outer pole piece radius was varied and, as a result, it was obtained a growth of the axial peak magnetic field value when the outer pole piece radius was reduced. This behavior was observed when the outer pole piece radius ranged 8.7 mm -6.3 mm. The axial magnetic field peaks obtained by the XMAGUN were compared with the analytically calculated and the FEM commercial code ANSYS and good agreement was observed.