Reaching high poloidal beta at Greenwald density with internal transport barrier close to full noninductive current drive.
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.
Hobirk
J
J
Max-Planck-Institut für Plasmaphysik, EURATOM Association, Boltzmannstrasse 2, D-85748 Garching, Germany.
Wolf
R C
RC
Gruber
O
O
Gude
A
A
Günter
S
S
Kurzan
B
B
Maraschek
M
M
McCarthy
P J
PJ
Meister
H
H
Peeters
A G
AG
Pereverzev
G V
GV
Stober
J
J
Treutterer
W
W