Deuterium implantation in actively cooled beryllium monoblocks
The amount of tritium buried in the first wall of a fusion reactor could turn out to be the decisive factor for the choice of wall material. In the case of copper, the common material for beam dumps, a large discrepancy has been found between data published from surface analysis groups and data from neutron generators on the amount of implanted hydrogen. In neutron generators with high particle energies and fluxes, trapping appears to be dominant and implanted hydrogen concentrations of up to 40 at% are reported. Well controlled low flux experiments done for surface analysis yield concentrations below 1 at% and the amount of implanted hydrogen is dominated by diffusion and surface recombination. To investigate if similar discrepancies are found in beryllium a test section was analysed with nuclear reaction analysis after an exposure test with deuterium beams.
Bibliographic Reference: Report: JET-R(97)03 EN (1997) 12pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
Record Number: 199711720 / Last updated on: 1998-01-20
Original language: en
Available languages: en