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Overview of co-deposition and fuel inventory in castellated divertor structures at JET
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- Rubel, Marek J. (author)
- KTH,Fusionsplasmafysik
- Coad, J. P. (author)
- Pitts, R. A. (author)
- (creator_code:org_t)
- Elsevier, 2007
- 2007
- English.
- In: Journal of Nuclear Materials. - : Elsevier. - 0022-3115 .- 1873-4820. ; 367, s. 1432-1437
- Journal article (peer-reviewed)
Abstract
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- The main focus of this work is fuel retention in plasma components of the JET water-cooled Mk-I divertors operated with small tiles, first with carbon fibre composite (CFC) and then with castellated beryllium. Until recently these have been the only large-scale structures of this type used in fusion experiments. Three issues regarding fuel retention and material migration are addressed: (i) accumulation in gaps separating tiles and in the grooves of castellation; (ii) comparison of deposition on carbon and beryllium; (iii) in-depth migration of deuterium into the bulk of CFC. The essential results are summarised as follows: (i) co-deposition occurs up to a few cm deep in the gaps between the Mk-I tiles; (ii) fuel inventory in the CFC tile gaps exceeds that on plasma-facing surfaces by up to a factor of 2; (iii) in gaps between the beryllium tiles from the inner divertor corner the fuel content reaches 30% of that on plasma-facing surfaces, whereas in the grooves of castellation in Be the fuel content is less than 3.0% of that found on the top surface; (iv) fuel inventory on the Be tiles is strongly associated with the carbon co-deposition; (v) the D content measured in the bulk (1.5 mm below the surface) on cleaved CFC tiles exceeds 1 x 10(15) cm(-2). Implications of these results for a next-step device are addressed and the transport mechanism into the gaps is briefly discussed. The results presented here suggest that in a machine with non-carbon walls in the main chamber (as foreseen for ITER) the material transport and subsequent fuel inventory in the castellation would be reduced.
Keyword
- DEUTERIUM; CARBON; PENETRATION; DEPOSITION; RETENTION; PLASMA; WALL
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- ref (subject category)
- art (subject category)
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