Considerations for the nano aperture ion source: Geometrical design and electrical control

A new type of ion source is being developed for proton beam writing and other focused ion beam applications. The potential of this source as well as achieved performance of the nano aperture ion source will be evaluated. Based on the ideal source parameters, critical geometrical parameters constraining chromatic aberrations and a possible pathway to achieve this performance will be presented. Finally, an electronic control system to minimize chromatic and spherical aberrations to an acceptable level will be demonstrated.