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Engineering solutions are identified and analysed for key high power density components of tight aspect ratio tokamak reactors (spherical torus reactors). The potentially extreme divertor heat loads can be reduced to about 3 MW/m2 in expanded divertors using coils inside the demountable toroidal field coils. Given the long and narrow divertor channels, gaseous divertor targets become possible, which eliminate sputtering and increase the divertor life. The unshielded centre conductor post (CCP) of the toroidal field coil can be made of a single dispersion strengthened copper conductor cooled by high velocity pressurised water to maintain acceptable copper temperature and strength. Damage and activation of the CCP at a neutron fluence of 10 MW-a/m2 are also tolerable. Annual replacement of the centre post, the divertor assemblies and the blanket can be accomplished with vertical access for all torus components, which are modularised to reduce size and weight. The technical requirements of these solutions are shown to be comparable with, if not less demanding than, those estimated for conventional tokamak reactors.

Additional information

Authors: PENG Y-K M, Oak Ridge National Laboratory, Oak Ridge (US);HICKS J B, UKAEA, Culham Laboratory, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: AEA FUS 64 EN (1990) 5 pp.
Availability: Available from the Librarian, UKAEA, Culham Laboratory, Abingdon, Oxon. OX14 3DB (GB)
Record Number: 199110102 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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