CONFINEMENT AND TRANSPORT STUDIES AT HIGH POWER IN ASDEX UPGRADE

TL;DRAbstract

At ASDEX Upgrade the NBI heating power has been doubled to 14 MW H or 20 MW D. Additionally the new cryo pump (100 l/s)[1] started operation increasing the pumping capacity by a factor of ≈ 7. This allows to analyse a substantially wider part of the parameter space in terms of transport and confinement. Since the higher H power now allows to obtain type I ELMy H-modes in hydrogen as well, the first part of this paper treats the isotope effect of type I ELMy H-mode confinement which is investigated by global and local analysis. The second part compares type I and type III ELMy H-mode global and local confinement data to investigate the effect of pedestal height and profile stiffness. Finally, we analyse the effect of the saturation of the stored kinetic energy with increasing power in H and D. The analysis is limited to plasmas without neoclassical tearing modes which have been observed with deuterium for powers above 5 MW to 15 MW depending mainly on βN and ν [2].

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