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Abstract

The helias reactor is an upgraded version of the Wendelstein 7-X experiment, which is under construction I the city of Greifswald. The modular coil system comprises 50 coils, which are constructed using NbTi-superconducting cables. The basic dimensions are: major radius 22m, average plasma radius 1.8m, magnetic field on axis 5T, maximum field coils 10T.

Over the past ear progress toward better understanding of the fusion plasma has been made. In particular, the following issues have been addressed:

-plasma equilibrium and MHD stability
-Neoclassical transport in the Helias configuration
-Start-up scenarios and steady state burn
-Alpha-particle orbits and alpha-particle losses
-Drift waves in Helias configurations
-Modelling the fusion plasma using empirica scaling laws.

Technical studies have been focused on the optimization of the coil system with respect to magnetic field distribution, forces and stresses. In this context the ANSYS-code has been found useful for optimizing the support system. In a first survey several blanket concepts, developed for the DEMO tokamak, have been adapted to the Helias geometry. Presently a water-coole LiPb-blanket is favoured in comparison wit ceramic breeders, since safety properties and maintenance procedure seem to be more advantageous within this concept. Maintenance and replacement of blanket segments through portholes have also been studied with respect to their geometric compatability. Finally parameter studies of low aspect ratio Helias reactors will be discussed. discussed.

Additional information

Authors: WOBIG H, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE);AMANO T, National Institute of Fusion Studies, NIFS, Toki (JP);BEIDLER C D, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE);HARMEYER E, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE);HERRNEGGER F, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE);KENDL A, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE);KISSLINGER J, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE);NUHRENBURG C, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE);SIDORENKO I, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE);STRUMBERGER E, Max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE)
Bibliographic Reference: Report: IPP III/255 (1999), 22pp.
Availability: Available from the Librarian, max-Planck-Institut fur Plasmaphysik, Garching bei Munchen (DE)
Record Number: 200011909 / Last updated on: 2000-04-22
Category: PUBLICATION
Original language: en
Available languages: en
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