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(EXP5/06) Transport Analysis of ITB Discharges

A. G. Peeters¹⁾, A. Bergmann¹⁾, G. Conway¹⁾, H. Meister¹⁾, G. V. Pereverzev¹⁾, G. Tardini¹⁾, O. Gruber¹⁾, M. Manso²⁾, F. Serra²⁾, R. C. Wolf^1)
 
1) Max Planck Institut fuer Plasmaphysik, IPP Garching
²⁾ CNF, IST Lisboa

Abstract.  Detailed studies of the confinement physics in advanced scenarios on ASDEX Upgrade are presented. The confinement of the improved H-mode can largely be unified with that of the standard H-mode. The increase in the H-factor is partly due to density peaking, partly due to the density dependence in the scaling law, and partly due to the non-thermal population if a non-corrected scaling law is used. The confinement region of these discharges can be simulated well with the ITG/TEM models. Clear transport barriers are observed to be formed in discharges with reversed shear. Turbulence suppression is observed in these discharges, and within the error bars this is in agreement with the E×B paradigm. Monte Carlo simulations of the neoclassical transport in discharges with reversed shear show a reduction compared to the standard theory, and agree reasonably well with the experimental ion heat conductivity over a large inner region.

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