München 2019 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Postersitzung

P 18.92: Poster

Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax

Numerical investigation of the power transfer efficiency of inductively coupled plasmas in hydrogen and deuterium — •Dominikus Zielke1, Stefan Briefi1, David Rauner1, and Ursel Fantz1,21Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching — 2AG Experimentelle Plasmaphysik, Universität Augsburg, 86135 Augsburg

In ion sources for neutral beam heating systems for fusion, inductively coupled hydrogen and deuterium plasmas (ICPs) are used. To increase the reliability of these systems, it is desirable to reduce the power that has to be delivered by an RF generator being currently in the 100 kW range. This can be done by maximizing the power transfer efficiency η, i.e. the ratio of power absorbed by the plasma to the power that is delivered by the generator.

Experimental results at low RF powers in the 1 kW range show that besides parameters such as plasma and antenna geometries, RF frequency and power, also the used gas type (hydrogen or deuterium) has an influence on η.

While in the experiment specific effects such as the influence of the masses, collisional cross-sections and atom to molecular ratios cannot be decoupled, this is possible with numeric simulations. For this reason a dedicated time-dependent 1D multi-fluid model is used. The model simulates the inductive coupling between the antenna and the plasma self-consistently. The contribution covers quantitative investigations of each of the above mentioned specific effects and their respective influences on η.

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