Simulation of curved axis systems
John A. Rouse, Eric Munro, Liping Wang, Haoning Liu · Physics Procedia · 2008
In this paper we describe the software tools that we have developed for the analysis of charged particle optical systems with curved optical axes.Examples of such elements are: omega filters, which are used for energy selection; magnetic prisms, used for bending and separating beams; Wien filters, which can be used for separating two beams of different mass or velocity; and wide angle scanning systems where aberrations referred to a straight optical axis can become meaningless.The analysis of curved axis systems can be sub-divided into three main tasks: the computation of the electric and magnetic fields that the beam passes through; the computation of the axis path and the extraction of the necessary field quantities; and the computation of the optical properties and aberrations.We discuss the methods we've employed to accomplish these tasks and demonstrate the use of the software with some illustrative examples.