Abstract
In the ASDEX Upgrade tokamak, high poloidal beta up to 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 bootstrap and neutral beam driven current. To reach these conditions the discharge is operated at low plasma current ( ) and high neutral beam heating power ( ). 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.
- Received 16 April 2001
DOI:https://doi.org/10.1103/PhysRevLett.87.085002
©2001 American Physical Society