Focusing Simulation of a Dynamitron Accelerator Vacuum Tube for Electron Beam Transport

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This paper presents a simulation-based study on the magnetic focusing performance of a vacuum acceleration tube in a Dynamitron-type high-voltage electron accelerator. A 3D model is established to analyze electric field distributions and compare three magnetic focusing methods: current-carrying solenoid, permanent magnets, and superconducting coils. Focusing effectiveness is evaluated via the Poincaré crosssection at the beam exit. Results show that while solenoids and superconducting coils offer strong focusing, they face challenges in thermal management and cost, respectively. Permanent magnets provide a balance between performance and engineering feasibility, making them a promising solution for compact industrial irradiation accelerators.

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