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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/29587

Title: The Effects of Helium on Deuterium Retention in Tungsten Under Simultaneous Irradiation
Authors: Labelle, Andre Jean-Romeo Richard
Advisor: Haasz, Anthony A.
Davis, James W.
Department: Aerospace Science and Engineering
Keywords: Fusion
Tungsten
Deuterium
Helium
Plasma Surface Interactions
Simultaneous irradiation
Issue Date: 25-Aug-2011
Abstract: The trapping behavior of deuterium and helium in polycrystalline tungsten (PCW) under D+-only, He+-only, sequential and simultaneous irradiation was studied as a function of incident ion fluences and irradiation temperature. Deuterium implanted at 300 and 500 K gets trapped at surface adsorption sites, vacancy-related traps, or extended defects. No deuterium was trapped for 700 K implantations. Results were affected by tungsten-carbide impurities in PCW specimens. It is suggested that He trapping occurs via the formation of He clusters, at impurity sites, or as part of He-vacancy complexes. For sequential implantations, D and He were found to de-trap each other, with He impeding the trapping of D when implanted first at 300 K. Under simultaneous irradiation a decrease in D inventories was observed for all cases, and a re-distribution of He to higher energy traps (associated with He-vacancy complex formation) was observed for higher fluences and temperatures.
URI: http://hdl.handle.net/1807/29587
Appears in Collections:Master

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