Geometry optimization of ECRIS plasma chamber

In the cylindrical resonant cavities of Electron Cyclotron Resonance Ion Sources (ECRIS) microwave fields are used to generate and sustain the plasma. The design of resonant cavities and the related microwaves injection lines play a key role in the creation of intense electromagnetic fields, to generate and sustain the magnetized plasma. This paper presents an innovative geometry, as an alternative to the conventional cylindrically shaped plasma chamber, whose aim is the improvement of the microwave-to-plasma coupling, and the consequent optimization of the on axis electric field. The geometry has been numerically validated by joining COMSOL Multiphysics®, for the calculation of the electromagnetic fields and MatLab® to implement the plasma through its 3D dielectric tensor. The results are very promising and could be applied to any ECRIS.