title: Quasistationary high confinement discharges with trans-greenwald density on TEXTOR-94
abstract: Confinement quality as good as ELM-free H-mode at densities substantially above the Greenwald density limit ( &nmacr;(e,0)/n(GW) = 1.4) has been obtained in discharges with a radiative boundary under quasistationary conditions for 20 times the energy confinement time. This is achieved by optimizing the gas-fueling rate of RI-mode discharges which tailors their favorable energy confinement and leads to discharges with beta values just below the operational limit beta(n) = 2 of TEXTOR-94, thereby effectively avoiding confinement back transitions or disruptions. In addition, this high-density regime is favorable for helium removal and results in figures of merit tau(*)(p,He)/tau(E) approximately 10-15, relevant for a future fusion power reactor.
authors.affiliation: Institut fur Plasmaphysik, Forschungszentrum Julich GmbH, EURATOM Association, D-52425 Julich, Germany.
authors.initials: G
authors.lastname: Mank
authors.initials: AM
authors.lastname: Messiaen
authors.initials: J
authors.lastname: Ongena
authors.initials: B
authors.lastname: Unterberg
authors.initials: P
authors.lastname: Dumortier
authors.initials: KH
authors.lastname: Finken
authors.initials: R
authors.lastname: Jaspers
authors.initials: HR
authors.lastname: Koslowski
authors.initials: A
authors.lastname: Kramer-Flecken
authors.initials: J
authors.lastname: Rapp
authors.initials: U
authors.lastname: Samm
authors.lastname: van Wassenhove G
authors.initials: RR
authors.lastname: Weynants