Multiphysics modeling based design of a key-holes magnetron

Abstract

This paper proposes a particular design technique of an 8 slots resonant cavities X-Band Magnetron. Such study is based on a Multiphysics (MP) simulation and consider thermal-structural effects due to the cathode heating, taking into account that electromagnetic behavior and thus device efficiency depend critically to the operating temperature and to the related thermal induced displacements of the materials. The proposed study involves Thermal Stress (TS), Eigen-frequency (EF) and Particle Tracing (PT) analysis performed with the Finite Element Method (FEM). These computations have been performed on COMSOL. Electric field related to the main resonant modes and particle trajectories have been computed in thermo mechanical operative conditions. Magnetron working points have been estimated.