J. Hobirk, R.C. Wolf, O. Gruber, A. Gude, S. Günter, B. Kurzan, M. Maraschek, P.J. Mc Carthy, H. Meister,A.G. Peeters, G.V. Pereversev, J. Stober, W. Treutterer and the ASDEX Upgrade Team;

2001

August

Physical Review Letters

Reaching high poloidal beta at Greenwald density with internal transport barrier close to full noninductive current drive

Validated

WOS: 29 ()

REVERSED MAGNETIC SHEAR DIII-D TOKAMAK ASDEX UPGRADE ARBITRARY COLLISIONALITY IMPROVED CONFINEMENT BOOTSTRAP CURRENT DISCHARGES JT-60U ELECTRON PLASMAS

87

8

085002

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.

10.1103/PhysRevLett.87.085002