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H. Wobig, C. D. Beidler,
J. Kißlinger, E. Harmeyer, F. Herrnegger
Max-Planck-Institut für Plasmaphysik, Garching bei München, Germany, EURATOM-Ass.
Abstract. The Helias stellarator reactor is an
upgrade version of the Wendelstein 7-X device taking into account the design
criteria of a power reactor. The dimensions of a Helias reactor are: Major
radius 22 m, average plasma radius 1.8 m, magnetic field on axis 4.75 T,
fusion power about 3000 MW. Neoclassical transport sets a lower limit on
plasma confinement, and extensive numerical calculations have been done to
clarify this issue. Extrapolating empirical scaling laws to a Helias reactor
shows that anomalous confinement determines the ignition conditions. The
effect of parameter variations on ignition is studied. The result of these
zero dimensional calculations is also compared with start-up scenarios
obtained with the ASTRA code.
IAEA 2001
