Towards strongly HOM-damped multi-cell RF cavities

This paper discusses the prospects for very strong HOM damping in multi-cell RF cavities. There has been much progress in recent years towards "HOM-free" single-cell cavities. Many examples are now operating in high current storage rings around the world. There have also been successes in broad-band damping of multi-cell structures to levels appropriate for linear colliders and low average current applications. We describe the use of modern simulation tools to explore the potential for applying these techniques to multicell structures. Such cavities would be useful for high-current, high-power applications such as high luminosity collider storage rings, damping rings, energy recovered linacs and injector systems. These methods may be applicable in to both room temperature and superconducting cavities.