title: Evidence from numerical simulations of transport-barrier relaxations in tokamak edge plasmas in the presence of electromagnetic fluctuations.
abstract: The dynamics of transport barriers in fusion plasmas is studied in the presence of electromagnetic fluctuations. The work is based on numerical simulations using a new three-dimensional electromagnetic fluid turbulence code (EMEDGE3D). In these simulations, the transport-barrier exhibits intermittent relaxation cycles. It is found that magnetic fluctuations have a negligible influence on the relaxation process while the magnetic activity is enhanced during these relaxations, in agreement with experimental observations.
authors.affiliation: France-Japan Magnetic Fusion Laboratory, LIA 336 CNRS/UMR 6633, CNRS-Université de Provence, Case 321, 13397 Marseille Cedex 20, France.
authors.forename: G
authors.initials: G
authors.lastname: Fuhr
authors.forename: P
authors.initials: P
authors.lastname: Beyer
authors.forename: S
authors.initials: S
authors.lastname: Benkadda
authors.forename: X
authors.initials: X
authors.lastname: Garbet