Physics of Internal Transport Barriers

This article presents an overview of the studies carried out at JET to clarify the physics of Internal Transport Barriers. Results of dedicated experiments, modelling and theory are reported. Several issues are discussed, namely the question of the dominant mechanisms for barrier formation and the nature of the transition, the role of magnetic surfaces in barrier triggering, the question of radial location and width of barriers, and the predictive capability of transport and turbulence modelling. To cite this article: T. Tala et al., C. R. Physique 7 (2006).