Hydrogen isotope exchange in tungsten irradiated sequentially with low-energy deuterium and protium ions
Alimov, V Kh; Tyburska-Püschel, B; 't Hoen, M H J; Roth, J; Hatano, Y; Isobe, K; Matsuyama, M; Yamanishi, T; Alimov, V Kh; Hydrogen Isotope Research Center, University of Toyama, Toyama 930-8555, Japan; Tritium Technology Group, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan; Tyburska-Püschel, B; Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching, Germany; 't Hoen, M H J; Institute for Plasma Physics Rijnhuizen, EURATOM–FOM, NL-3439 MN Nieuwegein, The Netherlands; Roth, J; Max-Planck-Institut für Plasmaphysik, EURATOM Association, D-85748 Garching, Germany; Hatano, Y; Hydrogen Isotope Research Center, University of Toyama, Toyama 930-8555, Japan; Isobe, K; Tritium Technology Group, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan; Matsuyama, M; Hydrogen Isotope Research Center, University of Toyama, Toyama 930-8555, Japan; Yamanishi, T; Tritium Technology Group, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
Журнал:
Physica Scripta
Дата:
2011-12-01
Аннотация:
Hydrogen isotope exchange in tungsten was investigated at various temperatures both after sequential exposure to low-energy deuterium (D) and protium (H) plasmas and after sequential irradiation with low-energy D and H ions. The methods used were thermal desorption spectroscopy, and the D(<sup>3</sup>He,p)<sup>4</sup>He nuclear reaction at <sup>3</sup>He energies varied from 0.69 to 4.0 MeV, allowing the determination of the D concentration at depths of up to 6 μm. It was found that a major portion of the deuterium initially accumulated in the D-implanted W is released on subsequent exposure to H plasma or irradiation with H ions. Depth profiling of D without and with subsequent H implantation shows strong replacement close to the surface near room temperatures, but extending to all analyzable depths at elevated temperatures.
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