Dynamics of hydrogenic retention in molybdenum: First results from DIONISOS

G.M. Wright, D.G. Whyte, J.G. Kulpin, B. Lipschultz, R.P. Doerner

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The DIONISOS (Dynamics of ION Implantation and Sputtering of Surfaces) experiment is described. DIONISOS features steady-state plasma exposure of material surfaces, with simultaneous, in situ, non-destructive depth profiling on the same surfaces with ion beam analysis (IBA). A steady-state RF helicon plasma source produces a fusion 'edge-like' low temperature (T ∼ 1-10 eV), high-density (≤10 m), steady-state, cylindrical, plasma (φ{symbol} ∼ 50 mm). The exposure stage allows for the control of sample surface temperature (300-800 K), incident ion energy (10-500 eV), and ion beam and magnetic field incident angle (360° rotation), during bombardment with high plasma flux (∼10-10 s m). First results from DIONISOS show a large and evolving concentration of deuterium (∼1000 appm) trapped deep (∼5 μm) in molybdenum. IBA during plasma exposures shows the surface dynamic deuterium inventory increased by a factor of 2 over the 'long-term' trapped inventory at an incident ion flux density of ∼1.5 × 10 D/m s.
Original languageEnglish
Pages (from-to)977-983
Number of pages7
JournalJournal of Nuclear Materials
Issue number1-3
Publication statusPublished - 15 Jun 2007

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