Reaching high poloidal beta at Greenwald density with internal transport barrier close to full noninductive current drive - art. no. 085002

Authors
Hobirk, J Wolf, RC Gruber, O Gude, A Gunter, S Kurzan, B Maraschek, M McCarthy, PJ Meister, H Peeters, AG Pereverzev, GV Stober, J Treutterer, W
Citation
J. Hobirk et al., Reaching high poloidal beta at Greenwald density with internal transport barrier close to full noninductive current drive - art. no. 085002, PHYS REV L, 8708(8), 2001, pp. 5002
Citations number
27
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
8708
Issue
8
Year of publication
2001
Database
ISI
SICI code
0031-9007(20010820)8708:8<5002:RHPBAG>2.0.ZU;2-A
Abstract
In the ASDEX Upgrade tokamak, high poloidal beta up to beta (pol) = 3 at th e Greenwald density with H-mode confinement has been reached. Because of th e high beta, the plasma current is driven almost fully noninductively, cons isting 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 cur rents may offer a promising way for an advanced scenario based fusion react or.