Advances in beam optics analyzer

Summary form only given. Calabazas Creek Research (CCR) has been developing Beam Optics Analyzer, an adaptive mesh, finite element, charged particle trajectory modeling tool for designing 3D electron devices for the past decade. Its built-in optimizer allows designers to obtain optimal designs for Brillouin focused electron guns, traveling wave tubes and confined flow Pierce electron guns. All analysis types available in BOA including electrostatics, beam optics, electrostatic PIC, magnetostatics, inhomogeneous Helmholtz and heat transfer share the same CAD model. Although sharing the same model, each analysis type can still disable/enable the parts pertained to the analysis. For instance, a complete CAD model of an electron gun may include magnetic coils and irons. By disabling the coils and irons for the beam optics model and keeping only the emitter and electrodes would greatly reduce the computer resource requirements. BOA can switch an analysis type with the click of a button. It will then automatically update the material properties, boundary conditions and remesh if required. This paper will describe BOA capabilities to design all components of an electron beam from its emitter, magnetic focusing system, to the resonant cavities and the collector. We will present the current status and advances toward the goal of making BOA a multiphysics modeling and simulation tool. We will present the numerical results for several devices designed by BOA and currently being fabricated including an electron gun with self magnetic field and a S-band collector with its cooling requirements. We will also discuss various emittance formulations and show the emittance of a highly relativistic beam.