title: Reaching high poloidal beta at Greenwald density with internal transport barrier close to full noninductive current drive.
abstract: In the ASDEX Upgrade tokamak, high poloidal beta up to beta(pol) = 3 at the Greenwald density with H-mode confinement has been reached. Because of the high beta, the plasma current is driven almost fully noninductively, consisting of 51% bootstrap and 43% neutral beam driven current. To reach these conditions the discharge is operated at low plasma current ( I(P) = 400 kA) and high neutral beam heating power ( P(NBI) = 10 MW). The discharge combines an edge (H mode) and internal transport barrier at high densities without confinement-limiting MHD activities. The extrapolation to higher plasma currents may offer a promising way for an advanced scenario based fusion reactor.
authors.affiliation: Max-Planck-Institut für Plasmaphysik, EURATOM Association, Boltzmannstrasse 2, D-85748 Garching, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Hobirk
authors.forename: R C
authors.initials: RC
authors.lastname: Wolf
authors.forename: O
authors.initials: O
authors.lastname: Gruber
authors.forename: A
authors.initials: A
authors.lastname: Gude
authors.forename: S
authors.initials: S
authors.lastname: Günter
authors.forename: B
authors.initials: B
authors.lastname: Kurzan
authors.forename: M
authors.initials: M
authors.lastname: Maraschek
authors.forename: P J
authors.initials: PJ
authors.lastname: McCarthy
authors.forename: H
authors.initials: H
authors.lastname: Meister
authors.forename: A G
authors.initials: AG
authors.lastname: Peeters
authors.forename: G V
authors.initials: GV
authors.lastname: Pereverzev
authors.forename: J
authors.initials: J
authors.lastname: Stober
authors.forename: W
authors.initials: W
authors.lastname: Treutterer