| Popis: |
Many RF structures have symmetries which can be exploited by field solvers with appropriate boundary conditions. These symmetries allow a reduced problem to be solved, which leads to faster and/or more accurate solutions. Of particular interest to the accelerator community are periodic structures. Quasi‐periodic boundary conditions allow modes with any desired phase advance given a single cell of the periodic structure. For symmetric periodic structures there is a variation which requires only a half cell of the periodic structure. These boundary conditions can also be used for rotationally periodic structures, such as cross‐field amplifiers and magnetrons. Boundary conditions for some other symmetries, such as reflection symmetry about a plane and about a point, will also be reviewed. |
