Reaching high poloidal beta at Greenwald density with internal transport barrier close to full noninductive current drive
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Date
2001
Authors
Hobirk, Jorg
Wolf, Robert C.
Gruber, O.
Gude, A.
Günter, Sibylle
Kurzan, Bernd
Maraschek, Marc
McCarthy, Patrick J.
Meister, Hans
Peeters, Arthur G.
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Publisher
American Physical Society
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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.
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Keywords
Reversed magnetic shear , diii-d tokamak , Asdex upgrade , Arbitrary collisionality , Improved confinement , Bootstrap current , Discharges , jt-60u , Electron , Plasmas
Citation
Hobirk, J., Wolf, R. C., Gruber, O., Gude, A., Günter, S., Kurzan, B., Maraschek, M., McCarthy, P. J., Meister, H., Peeters, A. G., Pereverzev, G. V., Stober, J., Treutterer, W. and Team, A. U. (2001) 'Reaching high poloidal beta at Greenwald density with internal transport barrier close to full noninductive current drive', Physical Review Letters, 87(8), 085002 (4pp). doi: 10.1103/PhysRevLett.87.085002
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© 2001, American Physical Society