Xwake 1.1: a New Impedance and Wake Field Software Package

This paper outlines the novel features found in Xwake 1.1. This release of Xwake is a body of revolution (BOR) conformal finite difference time domain (FDTD) code written to model longitudinal and transverse wake fields and impedances. The package is capable of accurately modeling slowly tapered structures as well as devices containing dielectric and permeable media. A state of the art perfectly matched layer (PML) absorbing boundary condition (ABC) provides the ability to truncate the computational grid immediately at a devices’ beam pipe openings, increasing the computational efficiency of the package. The program includes automatic mesh generator, field solver and post processor plotting modules all integrated with an intuitive graphical user interface. Since the package is written with ANSI-C and the Motif widget set, Xwake 1.1 is portable across UNIX environments. The use of dynamic memory allocation enables the program to automatically scale itself to the problem size without resorting to code recompilation.