Martin Gardfjell, Applied Physics
Title of Master's thesis: Simulating Electron Optics in COMSOL for EBM Application
Follow the presentation online
Main Supervisor: David Svensson (Arcam AB)
Additive Manufacturing (AM) is a growing industry that has the potential to completely revolutionize global manufacturing. Electron Beam Manufacturing (EBM) is a 3D-printing method developed by GE Additive that utilizes an electron beam, controlled by a magnetic lens system, to melt metal powder. GE is currently investigating methods for simulating the Electron Optics, with the ambition to further develop their EBM technology. In this project a model of the lens system has been built and evaluated in COMSOL Multiphysics. Using the Finite Element Method (FEM) and Time Step Particle Tracing it was possible to simulate the electron trajectories in 25 min. The computational time was further reduced to 5 min by replacing predictable calculations with constant values and replacing COMSOL’s default Generalized Alpha Time Stepping algorithm with a simpler algorithm in certain regions. The improved simulation achieved the same electron beam characteristics, while only displacing the average electron position by 100 µm in the focal plane.
With support from Calle Hellestam (Manager of BeamTeam), Marie Doverbo (Simulated the electron source) and the rest of the people in BeamTeam.
Examiner: Paolo Vinai
Opponents: Filip Frostelind and Adrian Eriksson
Student project presentation
28 May, 2020, 13:15
28 May, 2020, 14:15