The Influence of Microstructure on Deuterium Retention in Polycrystalline Tungsten

Garrison, Lauren M.; Meyer, Fred W.; Bannister, Mark E.

doi:10.1080/15361055.2017.1352431

Title: The Influence of Microstructure on Deuterium Retention in Polycrystalline Tungsten

Journal Article · Mon Sep 18 00:00:00 EDT 2017 · Fusion Science and Technology

DOI:https://doi.org/10.1080/15361055.2017.1352431· OSTI ID:1429215

^[1]; Meyer, Fred W. ^[1];

^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The retention of hydrogen isotopes in the plasma-facing materials of a fusion reactor is dependent on the density of trapping sites in the material. One factor that can influence the trapping defects is the surface state of the material before exposure. Mechanically polished, electropolished, and recrystallized tungsten samples were compared by exposing them to 350 eV D⁺ beams with peak fluences of ~1 × 10²⁴ D⁺/m² at 500 and 740 K at the Multicharged Ion Research Facility (MIRF). At the exposure temperature of 740 K, no significant retention was detected. For material exposed at 500 K, significant differences in retention were observed, and the order of increasing retention was recrystallized, electropolished, and mechanically polished. Lastly, the other variable besides surface treatment was the time delay between ion exposure and thermal desorption spectroscopy which also may have impacted the retention measurements if there was out-gassing of the D while samples were in storage before thermal desorption spectroscopy (TDS).

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1429215

Journal Information:: Fusion Science and Technology, Vol. 72, Issue 4; ISSN 1536-1055

Publisher:: American Nuclear SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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References (19)

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