Suppression of the sawtooth instability in a storage ring by free-electronlaser: An example of nonlinear stabilization by noise - art. no. 134801

The stabilization of nonlinear excitations by noise is a topic of fundament al importance in many physical problems. We discuss a genuine example withi n the context of storage ring-free electron laser physics, by presenting a model which allows the characterization of the system evolution and the det ermination of the conditions leading to the suppression of instabilities of sawtooth type. The conclusions of the model are confirmed by a comparison with experimental results on the Super Aco Storage Ring-Free Electron Laser .