|Title||Hydrogenic retention in tungsten exposed to ITER divertor relevant plasma flux densities|
|Publication Type||Conference Proceedings|
|Year of Publication||2009|
|Authors||G.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|
|Publisher||Elsevier Science Bv|
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
|URL||<Go to ISI>://000267747300142|
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