[Zurück]

N. Schupfer, D. Tskhakaya, R. Khanal, F. Aumayr, S. Figueira da Silva, S. Kuhn, Hp. Winter:
"Influence of particle-induced electron emission on the plasma sheath voltage";
in: "Contributions 15th Symp. on Atomic & Surface Physics and Related Topics", V. Grill, T. Märk (Hrg.); 15th Symp. on Atomic & Surface Physics and Related Topics, Innsbruck, 2006, ISBN: 3-901249-82-6, S. 90 - 93.

The boundary region of magnetically confined fusion plasmas is of great relevance for the generation and transport of plasma impurities between the material boundary (first wall, divertor plates) and the hot core plasma. The concentration of impurities, including He ash in future D-T fusion reactors, determines transport of the non-neutronic part of fusion power (energetic neutral and charged particles vs. radiation) from the core plasma to the boundary, which influences the plasma-wall interaction processes. Local plasma cooling by impurity ion radiation causes steeper density and temperature gradients and thereby can support formation of internal transport barriers (ITBs) for improved plasma confinement. In this whole context the potential drop between the sheath edge and the material boundary (the so-called plasma sheath voltage, PSV) is important for desorption and sputtering from the wall material.

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