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(EXP1/12) Advanced Tokamak Operation on ASDEX Upgrade

   
R. C. Wolf , O. Gruber , R. Dux , S. Günter , A. Kallenbach , K. Lackner , M. Maraschek , H. Meister , G. Pereverzev , F. Ryter , U. Seidel , S. Sesnic , J. Schweinzer , A. Stäbler , J. Stober , W. Ullrich , and the ASDEX Upgrade Team 
 
Max-Planck-Institut für Plasmaphysik, EURATOM-Association, D-85748 Garching, Germany

Abstract
Discharges with improved core confinement by a modification of the current profile using additional heating in the current ramp-up phase have been investigated. In plasmas with internal transport barriers  and L-mode  edge central ion temperatures up to 15 keV, corresponding to ion thermal conductivities at neoclassical values, have been achieved transiently. Stationary discharges with H-mode  edge and internal transport barrier with central values of $\rm T_i = 10$ keV and $\rm T_e = 6.5$ keV could be maintained for 6 s, only limited by the given duration of the neutral beam injection, which corresponds to 40 confinement times or 2.4 resistive time scales for internal current diffusion. In this regime of operation not only the ion thermal conductivity is approaching neoclassical value but also the electron transport is significantly reduced.

       

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