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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 non-inductively, 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.

Additional information

Authors: HOBIRK J ET AL, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE);ASDEX UPGRADE TEAM, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE);MCCARTHY P J, University College Cork, Physics Department, Cork (IE)
Bibliographic Reference: An article published in: Physical Review Letters, Vol.87, No.8 (2001), pp.085002 1-085002 4
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