A numerical and experimental study of a control method aimed at channeling
chaos by building barriers in phase space is performed on a paradigm for
wave-particle interaction, i.e., a traveling wave tube. Control of chaotic
diffusion is achieved by adding small apt modifications to the system with a
low additional cost of energy. This modification is realized experimentally
through additional waves with small amplitudes. Robustness of the method is
investigated both numerically and experimentally