  Chaos often represents a severe obstacle for the set-up of many-body
experiments, e.g., in fusion plasmas or turbulent flows. We propose a strategy
to control chaotic diffusion in conservative systems. The core of our approach
is a small apt modification of the system which channels chaos by building
barriers to diffusion. It leads to practical prescriptions for an experimental
apparatus to operate in a regular regime (drastic enhancement of confinement).
The experimental realization of this control on a Travelling Wave Tube opens
the possibility to practically achieve the control of a wide range of systems
at a low additional cost of energy.
