title: Experimental observation of nonlinear synchronization due to a single wave.
abstract: A test electron beam is propagated in a specially designed traveling wave tube. It interacts with a nonresonant wave, and its energy distribution is recorded at the tube output. We report the direct experimental observation of the spatially periodic electron velocity bunching, and of a nonlinear effect on the electron velocity modulation: the synchronization of the particles with the wave responsible for Landau damping in plasma physics. The results are explained by second order perturbation theory in the wave amplitude.
authors.affiliation: Physique des interactions ioniques et moléculaires, Unité 6633 CNRS-Université de Provence, Equipe turbulence plasma, case 321, Centre de Saint-Jérôme, F-13397 Marseille Cedex 20, France. doveil@up.univ-mrs.fr
authors.forename: F
authors.initials: F
authors.lastname: Doveil
authors.forename: D F
authors.initials: DF
authors.lastname: Escande
authors.forename: A
authors.initials: A
authors.lastname: Macor