Elsevier

Journal of Nuclear Materials

Volumes 196–198, 1 December 1992, Pages 729-734
Journal of Nuclear Materials

Deuterium trapping and impurity collection on a 1990 JET Be belt limiter

https://doi.org/10.1016/S0022-3115(06)80132-7Get rights and content

From a tile of the JET toroidal belt limiter installed during the 1990 operation period, samples were cut from the plasma-facing side along the poloidal direction and the surface layers were analysed by SEM and by the ion beam techniques NRA, PIXE, RBS and HIERD. The poloidal distribution of D is fairly uniform with values of up to 2×1017 cm−2. The contamination of the Be by metallic impurities from the vessel wall is typically up to 2×1016 Ni cm−2, 5×1015 Cr cm−2 and 2×1016 Fe cm−2, giving totally about 0.2 g of metals deposited on the upper limiter. Other impurities amount up to 3×1017 C cm−2, 7×1017 O cm−2, 2×1017 Cl cm−2, 2×1016 K cm−2, 4×1015 Ca cm−2, 3×1015 Ti cm−2 and 1×1015 Zn cm−2. The D deposition is about a factor of 4 smaller than on the C limiter of the previous discharge period, while the deposition of the Inconel components is about one order of magnitude smaller than on the C limiter. O is found to be trapped in the Be at depths up to several micrometers, which may be caused by segregation of pure Be through the oxide to the surface of oxide layers on the limiter. This would improve the O gettering of the Be. The lower D concentration is consistent with the observed degassing of D in the time between discharges.

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