Bremen 2017 – scientific programme
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P: Fachverband Plasmaphysik
P 13: Magnetic Confinement
P 13.8: Poster
Tuesday, March 14, 2017, 16:30–18:30, HS Foyer
On the comparison of energy confinement in stellarators and tokamaks — •Ulrich Stroth1,3, Birkenmeier Gregor3,1, Fuchert Golo2, Schneider Philip1, ASDEX Upgrade team1, and Wendelstein 7-X team2 — 1Max-Planck-Institut für Plasmaphysik, 85748 Garching — 2Max-Planck-Institut für Plasmaphysik, 17491 Greifswald — 3Physik-Department E28, Technische Universität München, 85747 Garching
With the ASDEX Upgrade (AUG) tokamak and the successful start of the stellarator Wendelstein 7-X (W7-X), the MPI for plasma physics operates two major fusion facilities. This motivates a direct comparison of the confinement quality of two fundamentally different magnetic configurations. While experimentally [1] and theoretically [2] it has been shown that turbulent transport can be expected to be rather different in character, the global energy confinement time of both stellarators and tokamaks can be described with the same scaling expression if appropriate parameters are chosen [3]. A physically relevant comparison of confinement has to concentrate on the transport coefficients. This can be achieved by eliminating from the scalings trivial parameter dependencies such as on plasma volume and surface or by directly comparing transport analyses of dimensionally similar discharges from both devices. The presentation discusses the different techniques for a direct confinement comparison and presents first applications to experimental data from AUG and W7-X.
[1] G. Birkenmeier et al., PRL 107(2011),025001; [2] P. Helander et al., PPCF 54(2012),124009; [3] U. Stroth, PPCF 40(1998),9