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

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 × 10 24 D +/m 2 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).
Authors:
ORCiD logo [1] ;  [1] ; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Fusion Science and Technology
Additional Journal Information:
Journal Volume: 72; Journal Issue: 4; Journal ID: ISSN 1536-1055
Publisher:
American Nuclear Society
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Deuterium retention; plasma-facing materials; surface preparation; recrystallized
OSTI Identifier:
1429215

Garrison, Lauren M., Meyer, Fred W., and Bannister, Mark E.. The Influence of Microstructure on Deuterium Retention in Polycrystalline Tungsten. United States: N. p., Web. doi:10.1080/15361055.2017.1352431.
Garrison, Lauren M., Meyer, Fred W., & Bannister, Mark E.. The Influence of Microstructure on Deuterium Retention in Polycrystalline Tungsten. United States. doi:10.1080/15361055.2017.1352431.
Garrison, Lauren M., Meyer, Fred W., and Bannister, Mark E.. 2017. "The Influence of Microstructure on Deuterium Retention in Polycrystalline Tungsten". United States. doi:10.1080/15361055.2017.1352431. https://www.osti.gov/servlets/purl/1429215.
@article{osti_1429215,
title = {The Influence of Microstructure on Deuterium Retention in Polycrystalline Tungsten},
author = {Garrison, Lauren M. and Meyer, Fred W. and Bannister, Mark E.},
abstractNote = {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).},
doi = {10.1080/15361055.2017.1352431},
journal = {Fusion Science and Technology},
number = 4,
volume = 72,
place = {United States},
year = {2017},
month = {9}
}