Bochum 2015 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 21: Theory and Modelling II
P 21.1: Hauptvortrag
Mittwoch, 4. März 2015, 14:00–14:30, HZO 50
Turbulence optimisation in stellarator experiments — •Josefine H. E. Proll1,2, Benjamin J. Faber3, Per Helander1, Samuel A. Lazerson4, Harry E. Mynick4, and Pavlos Xanthopoulos1 — 1Max-Planck/Princeton Center for Plasma Physics — 2Max-Planck-Institut für Plasmaphysik, Wendelsteinstr. 1, 17491 Greifswald, Deutschland — 3HSX Plasma Laboratory, University of Wisconsin-Madison, Madison, WI 53706, USA — 4Plasma Physics Laboratory, Princeton University, P.O. Box 451 Princeton, New Jersey 08543-0451, USA
Stellarators, the twisted siblings of the axisymmetric fusion experiments called tokamaks, have historically suffered from confining the heat of the plasma insufficiently compared with tokamaks and were therefore considered to be less promising candidates for a fusion reactor. This has changed, however, with the advent of stellarators in which the laminar transport is reduced to levels below that of tokamaks by shaping the magnetic field accordingly. As in tokamaks, the turbulent transport remains as the now dominant transport channel. Recent analytical theory suggests that the large configuration space of stellarators allows for an additional optimisation of the magnetic field to also reduce the turbulent transport. In this talk, the idea behind the turbulence optimisation is explained. We also present how an optimised equilibrium is obtained and how it might differ from the equilibrium field of an already existing device, and we compare experimental turbulence measurements in different configurations of the HSX stellarator in order to test the optimisation procedure.