Mainz 2022 – scientific programme
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P: Fachverband Plasmaphysik
P 19: Poster II
P 19.13: Poster
Thursday, March 31, 2022, 16:00–17:30, P
Experimental impurity transport analysis for tokamak regimes without type-I ELMs — •Tabea Gleiter1,2, Ralph Dux1, Marco Cavedon3, Rachael McDermott1, Francesco Sciortino1, Ulrike Plank1, and the ASDEX Upgrade Team1 — 1Max-Planck-Institut für Plasmaphysik, Garching, Germany — 2Physik-Department E28, Technische Universität München, Garching, Germany — 3Dipartimento di Fisica "G. Occhialini", Università di Milano-Bicocca, Milano, Italy
A profound knowledge of the transport of impurities is inevitable when it comes to designing tokamak reactor scenarios. In particular, it is necessary to integrate sufficient radiative cooling by impurities near the plasma edge with small impurity concentrations in the core.
High confinement regimes with no or little ELM activity (QCE or EDA H-mode) are promising candidates for future reactor operation. Information about their impurity transport mechanisms is therefore of large interest. In the focus is specifically the pedestal region since an edge transport barrier provokes suppressed turbulence and neoclassical inward transport in the inter-ELM phases of the standard H-mode. However, as no impurity accumulation is observed in the QCE and EDA-H modes despite their negligible ELM activity, a modification of the transport in this area is expected.
In this contribution, first results from transport studies in such ELM-free regimes at ASDEX Upgrade are presented. We show the inverse inference of radially and temporally resolved diffusion and convection from charge exchange recombination spectroscopy (CXRS) data.