Numerical Calculation of Coupling Impedances for Kicker Modules

Maintaining the impedance budget is an important task in the planning of any new accelerator facility. While estimates from analytical computations and measurements play a central role in doing so, numerical calculations have become an important alternative today. On the basis of the Finite Integration Technique, we have developed a simulation tool for the direct computation of coupling impedances in frequency domain. After discussing the special features of our code as compared to commercial programs, we present results for the transverse and longitudinal coupling impedances of the SNS extraction kicker and the injection/extraction system of the heavy-ion synchrotron SIS-18 at GSI.