title: Suppression of the sawtooth instability in a storage ring by free-electron laser: an example of nonlinear stabilization by noise.
abstract: The stabilization of nonlinear excitations by noise is a topic of fundamental importance in many physical problems. We discuss a genuine example within the context of storage ring-free electron laser physics, by presenting a model which allows the characterization of the system evolution and the determination 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.
authors.affiliation: ENEA, Divisione Fisica Applicata, Centro Ricerche Frascati, CP 65, 00044 Frascati, Rome, Italy.
authors.forename: R
authors.initials: R
authors.lastname: Bartolini
authors.forename: G
authors.initials: G
authors.lastname: Dattoli
authors.forename: L
authors.initials: L
authors.lastname: Mezi
authors.forename: A
authors.initials: A
authors.lastname: Renieri
authors.forename: M
authors.initials: M
authors.lastname: Migliorati
authors.forename: M E
authors.initials: ME
authors.lastname: Couprie
authors.forename: G
authors.initials: G
authors.lastname: De Ninno
authors.forename: R
authors.initials: R
authors.lastname: Roux