# A method for computing driving and detuning beam coupling impedances of an asymmetric cavity using eigenmode simulations

## TL;DR

This paper introduces a numerical eigenmode simulation method for calculating driving and detuning beam coupling impedances in asymmetric cavities, offering an alternative to traditional time-domain wakefield simulations.

## Contribution

It extends existing eigenmode-based impedance calculation methods from symmetric to asymmetric cavities, enhancing simulation capabilities.

## Key findings

- The method is validated against time-domain wakefield simulations.
- Eigenmode simulations effectively compute impedances in asymmetric cavities.
- Practical implementation details are discussed.

## Abstract

We propose a method for numerical calculation of driving and detuning transverse beam coupling impedances of an asymmetric cavity. The method relies on eigenmode simulations and can be viewed as an alternative to time domain wakefield simulations. A similar procedure is well-established for symmetric cavities, and this paper extends it to the case of an asymmetric cavity. The method is benchmarked with time-domain wakefield simulations and its practical implementation is discussed.