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Abstract

This study is directed towards the clarification of critical issues of advanced modular stellarator reactors exploiting the inherent potential of steady state operation, and is not a point design study of a reactor. Critical technology issues arise from the three dimensional magnetic field structure. The first wall, blanket and shield are more complex than those of axi symmetric systems, but this is eased at moderate to large aspect ratio typical of stellarators. Several blanket options have been studied and a thin blanket (21 cm) was the first choice for the design. Superconducting modular coils were investigated with respect to the conductor and mechanical supports. From the analysis of forces and stresses caused by the electromagnetic loads the coils are considered to be feasible, although shear stresses might pose a critical issue. Demountable intermagnetic support elements were designed for use at separation areas between the cryostat modules. A scheme for remote reactor maintenance was also developed. The plasma physics issues of different configurations were studied using extrapolations of transport behaviour and equilibrium from theory and present experiments. These studies indicate that the confinement and equilibrium behaviour is adequate for ignited operation at an average value of 5 % beta. Impurities may pose a critical issue. Several impurity control operations were investigated; a pumped limiter configuration utilizing the "ergodic layer" at the plasma edge was chosen for edge plasma and impurity control. A general conclusion of the study is that the modular stellarator configuration offers interesting prospects regarding the development towards steadystate reactors.

Additional information

Authors: BOEHME G, KERNFORSCHUNGSZENTRUM KARLRUHE (GERMANY);UNIVERSITY OF WISCONSIN (USA);MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING (GERMANY);HUEBNER J, KERNFORSCHUNGSZENTRUM KARLRUHE (GERMANY);UNIVERSITY OF WISCONSIN (USA);MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING (GERMANY);JENTZSCH K, KERNFORSCHUNGSZENTRUM KARLRUHE (GERMANY);UNIVERSITY OF WISCONSIN (USA);MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING (GERMANY);EL GUEBALY L A EMMERT G A, KERNFORSCHUNGSZENTRUM KARLRUHE (GERMANY);UNIVERSITY OF WISCONSIN (USA);MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING (GERMANY);GRIEGER G, KERNFORSCHUNGSZENTRUM KARLRUHE (GERMANY);UNIVERSITY OF WISCONSIN (USA);MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING (GERMANY);HARMEYER E, KERNFORSCHUNGSZENTRUM KARLRUHE (GERMANY);UNIVERSITY OF WISCONSIN (USA);MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING (GERMANY);ET AL KERNFORSCHUNGSZENTRUM KARLRUHE (GERMANY), KERNFORSCHUNGSZENTRUM KARLRUHE (GERMANY);UNIVERSITY OF WISCONSIN (USA);MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING (GERMANY);UNIVERSITY OF WISCONSIN (USA), KERNFORSCHUNGSZENTRUM KARLRUHE (GERMANY);UNIVERSITY OF WISCONSIN (USA);MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING (GERMANY);MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING (GERMANY), KERNFORSCHUNGSZENTRUM KARLRUHE (GERMANY);UNIVERSITY OF WISCONSIN (USA);MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, GARCHING (GERMANY)
Bibliographic Reference: WRITE TO MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, 8046 GARCHING BEI MUENCHEN (GERMANY) MENTIONING REPORT IPP 2/285, 1987
Record Number: 1989126005200 / Last updated on: 1988-02-01
Category: PUBLICATION
Available languages: en
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