title: Suppression of plasma turbulence during optimized shear configurations in JET
abstract: Correlation of density turbulence suppression and reduced plasma transport is observed in the internal transport barrier (ITB) region of JET tokamak discharges with optimized magnetic shear. The suppression occurs in two stages. First, low frequency turbulence and ion transport are reduced across the plasma core by a toroidal velocity shear generated by intense auxiliary heating. Then with the ITB formation, high frequency turbulence and electron transport are reduced locally within the steep pressure gradient region of the ITB.
authors.affiliation: JET Joint Undertaking, Abingdon, Oxfordshire OX14 3EA, United Kingdom.
authors.initials: GD
authors.lastname: Conway
authors.initials: DN
authors.lastname: Borba
authors.initials: B
authors.lastname: Alper
authors.initials: DV
authors.lastname: Bartlett
authors.initials: C
authors.lastname: Gormezano
authors.lastname: von Hellermann MG
authors.initials: AC
authors.lastname: Maas
authors.initials: VV
authors.lastname: Parail
authors.initials: P
authors.lastname: Smeulders
authors.initials: KD
authors.lastname: Zastrow