Isolating the detrapping of deuterium in heavy ion damaged tungsten via partial thermal desorption

Simmonds, M. J.; Schwarz-Selinger, T.; Yu, J. H.; Baldwin, M. J.; Doerner, R. P.; Tynan, G. R.

doi:10.1016/j.jnucmat.2019.05.016

Isolating the detrapping of deuterium in heavy ion damaged tungsten via partial thermal desorption

Journal Article · Sat May 18 00:00:00 EDT 2019 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2019.05.016· OSTI ID:1609942

Simmonds, M. J. ^[1]; Schwarz-Selinger, T. ^[2]; Yu, J. H. ^[3]; Baldwin, M. J. ^[3]; Doerner, R. P. ^[3]; Tynan, G. R. ^[3]

Univ. of California, San Diego, CA (United States); DOE/OSTI
Max Planck Inst. fuer Plasmaphysik, Garching (Germany)
Univ. of California, San Diego, CA (United States)

Partial Thermal Desorption Spectrometry (pTDS) progressively depopulated trapped deuterium (D) from heavy-ion damaged tungsten (W) to determine spatial location and detrapping energies. W samples were prepared identically: 5 MeV Cu2+ damaging ions (0.12 peak dpa dose) before D2 plasma loading (1024 D/m2 fluence) held at 373 K. Each sample reached one of six pTDS peak-and-hold temperatures. Nuclear Reaction Analysis (NRA) measured the D spatial profile remaining after pTDS, before final TDS. NRA and TDS measured total D retention were in good agreement. NRA displayed three zones of D-populated defects: (I) near-surface (below 0.1 µm), (II) heavy-ion damage (peaked ~1 µm), and (III) uniform intrinsic (bulk). D concentration in zone I reduced by ~ 97% in samples with pTDS at 597 K and higher, indicating near-surface traps have low detrapping energy. The Stopping and Range of Ions in Matter (SRIM) predicts a displacement profile for zone II that coincided with measured D profile for samples with pTDS at 597 K and higher. Samples prepared with pTDS below 597 K display a distinctly different D profile in zone II. The complete cycle of D2 plasma loading, pTDS, NRA, and final TDS was modeled with Tritium Migration Analysis Program (TMAP) using a recently developed Pseudo Trap and Temperature Partition (PTTP) scheme. Differences in TDS profiles isolated traps that release between consecutive pTDS temperatures, demonstrating 6 distinct release peaks. The best fit was found with detrapping energies near 1.0, 1.2, 1.4, 1.6, 1.8, and 1.9 eV. These results show that heating at 762 K for 2.5 hours released ~99% of retained D in heavy-ion damaged W.

View Accepted Manuscript (DOE)

Research Organization:: University of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-07ER54912; SC0001999

OSTI ID:: 1609942

Alternate ID(s):: OSTI ID: 22889977

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Journal Issue: C Vol. 522; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Deuterium
Heavy ion damage
Materials Science
NRA
Nuclear Science & Technology
Partial Thermal Desorption
Peak-and-hold
Retention
TDS
Tungsten

Isolating the detrapping of deuterium in heavy ion damaged tungsten via partial thermal desorption

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Figures / Tables (11)

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