Hydrogenic retention in tungsten exposed to ITER divertor relevant plasma flux densities

TitleHydrogenic retention in tungsten exposed to ITER divertor relevant plasma flux densities
Publication TypeConference Proceedings
Year of Publication2009
AuthorsG.M Wright, A.W Kleyn, E. Alves, L.C Alves, N.P Barradas, G.J van Rooij, A.J van Lange, A.E Shumack, J. Westerhout, R.S. Al, W.AJ Vijvers, B. de Groot, M.JV de Pol, H.J van der Meiden, J. Rapp, N.JL Cardozo
PublisherElsevier Science Bv
Accession NumberISI:000267747300142

Tungsten targets are exposed to the plasma conditions expected at the strike point of a detached ITER divertor (similar to 10(24) D/m(2)s, Te similar to 2 eV). The surface temperature of the target is similar to 1600 K at the center and decreased radially to similar to 1000 K at the edges. A 2-D spatial scan of the W target using nuclear reaction analysis (NRA) shows an asymmetric D retention profile with the lowest retention values at the center of the target and the highest 6 mm off-center. Even in the regions of larger retention, the D concentrations were <= 5 x 10(15) D/cm(2) as measured by NRA. Thermal desorption spectroscopy (TDS) is used to measure the global D retention. Very low retention with retained fractions ranging from 10(-7) to 10(-5) D-retained/D-incident were measured with TDS. Both NRA and TDS results show no clear dependence of retention on incident fluence possibly indicating the absence of plasma-driven trap production in W under these conditions. (C) 2009 Elsevier B.V. All rights reserved

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