Reaching high poloidal beta at Greenwald density with internal transport barrier close to full noninductive current drive
Hobirk, Jorg; Wolf, Robert C.; Gruber, O.; Gude, A.; Günter, Sibylle; Kurzan, Bernd; Maraschek, Marc; McCarthy, Patrick J.; Meister, Hans; Peeters, Arthur G.; Pereverzev, G. V.; Stober, J.; Treutterer, Wolfgang
Date:
2001
Copyright:
© 2001, American Physical Society
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
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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