Reaching high poloidal beta at Greenwald density with internal transport barrier close to full noninductive current drive
Wolf, Robert C.
McCarthy, Patrick J.
Peeters, Arthur G.
American Physical Society
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.
Reversed magnetic shear , diii-d tokamak , Asdex upgrade , Arbitrary collisionality , Improved confinement , Bootstrap current , Discharges , jt-60u , Electron , Plasmas
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
© 2001, American Physical Society