The influence of helium on deuterium retention in beryllium co-deposits

Založnik, Anže; Baldwin, Matthew J.; Doerner, Russell P.; Schwarz-Selinger, Thomas; Brezinsek, Sebastijan

doi:10.1016/j.jnucmat.2018.09.032

Title: The influence of helium on deuterium retention in beryllium co-deposits

Journal Article · 15 December 2018 · Journal of Nuclear Materials

DOI: https://doi.org/10.1016/j.jnucmat.2018.09.032 · OSTI ID:1609928

^[1]; Baldwin, Matthew J. ^[2]; Doerner, Russell P. ^[2]; Schwarz-Selinger, Thomas ^[3];

^[4]

Jozef Stefan Inst. (IJS), Ljubljana (Slovenia)
Univ. of California, San Diego, CA (United States)
Max Planck Inst. fuer Plasmaphysik, Garching (Germany)
Forschungszentrum Juelich (Germany)

Tritium co-deposition with materials from the plasma-facing components is expected to be the main contributor to tritium retention in ITER. Since He will also be present in the plasma as fusion ash during the DT campaign, this study focuses on the effect of He on D retention in Be co-deposits. The PISCES-B linear plasma device was used to create co-deposited Be-D-He layers for various deposition temperatures (295 K - 475 K) and He concentrations in D - αHe plasma mixtures (0 ≤ α ≤ 0.1). Thermal desorption spectroscopy and nuclear reaction analysis were used to determine the D concentration in co-deposits. For the lowest He concentration (1%) an increase of D retention was observed for the deposition at room temperature, whereas for higher He concentrations a declining trend of D retention was found. Including 10% of He in the plasma is found to reduce D retention at deposition temperatures below 425 K and have a negligible effect at higher deposition temperatures.

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

Sponsoring Organization:: USDOE Office of Science (SC); USDOE

Grant/Contract Number:: FG02-07ER54912

OSTI ID:: 1609928

Alternate ID(s):: OSTI ID: 1635900

Journal Information:: Journal of Nuclear Materials, Vol. 512, Issue C; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Modeling the sharp deuterium release from beryllium co-deposits Založnik, Anže; Baldwin, Matthew J.; Simmonds, Michael J. Nuclear Fusion, Vol. 59, Issue 12 https://doi.org/10.1088/1741-4326/ab407d	journal	October 2019