APS » PROLA » Phys. Rev. Lett. » Volume 87 » Issue 8

Phys. Rev. Lett. 87, 085002 (2001) [4 pages]

Reaching High Poloidal Beta at Greenwald Density with Internal Transport Barrier Close to Full Noninductive Current Drive
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J. Hobirk1, R. C. Wolf1, O. Gruber1, A. Gude1, S. Günter1, B. Kurzan1, M. Maraschek1, P. J. McCarthy2, H. Meister1, A. G. Peeters1, G. V. Pereverzev1, J. Stober1, W. Treutterer1, and ASDEX Upgrade Team1
1Max-Planck-Institut für Plasmaphysik, EURATOM Association, Boltzmannstrasse 2, D-85748 Garching, Germany
2Physics Department, University College Cork, Association Euratom-DCU, Cork, Ireland

Received 16 April 2001; published 2 August 2001

In the ASDEX Upgrade tokamak, high poloidal beta up to βpol  =  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 ( IP  =  400 kA) and high neutral beam heating power ( PNBI  =  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.


©2001 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v87/e085002
DOI: 10.1103/PhysRevLett.87.085002
PACS: 52.55.Fa

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