Analytical Method, based on Slater Perturbation Theorem, to Control Frequency Error when representing Cylindrical Structures in 3D Simulators

When simulating electrically large complex structures such as Drift Tube Linac (DTL) cavities in 3D simulators, it is important to choose a model representation that is a compromise between accuracy and time/resource cost. This paper presents an analytical method, based on Slater perturbation theorem, to control frequency error and obtain a fairly accurate 3D mesh to represent cylindrical structures.