Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 337, Issue 1-3, Pages 600-603Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2004.10.005
Keywords
molybdenum; deuterium retention; wall materials
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Both molybdenum and tungsten are candidate materials for plasma-facing applications in fusion reactors. While tungsten has a higher melting point and a higher threshold for sputtering, it is a brittle material that is difficult to machine into shapes required for fusion applications. For this reason, molybdenum is now receiving serious consideration as an alternative for tungsten. If molybdenum is to be used as a plasma-facing material, the hydrogen retention and recycling characteristics must be known. In this report, we present experimental results on deuterium retention in molybdenum after exposure to a Penning discharge at temperatures from 573 to 773 K. D-2(+) ions with energies of 1.2 keV were implanted into the 50 mm diameter molybdenum samples at fluxes of 10(20) D/m(2)s. Thermal desorption spectroscopy was used to determine both the amount of retained deuterium and the release kinetics. Low retention values similar to those measured previously for tungsten were observed. (c) 2004 Elsevier B.V. All rights reserved.
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