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H-mode confinement properties close to the power threshold in ASDEX Upgrade

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, , Citation F Ryter et al 2008 J. Phys.: Conf. Ser. 123 012035 DOI 10.1088/1742-6596/123/1/012035

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1 Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching

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1742-6596/123/1/012035

Abstract

Confinement properties close to the H-mode power threshold are studied in the ASDEX Upgrade tokamak. The results show that good confinement can be obtained close to the threshold with Type-I ELMs. The existence of Type-I ELMs does not necessarily require the heating power to be higher than the H-Mode power threshold, but it requires collisionality to be low enough. At higher collisionality Type-III ELMs replace the Type-I ELMs and confinement time is reduced by about 20%.

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10.1088/1742-6596/123/1/012035