Impact of seeded plasma impurities on D retention in RAFM steels

Nishijima, D.; Tokitani, M.; Patino, M. I.; Nagata, D.; Golubeva, A. V.; Doerner, R. P.

doi:10.1016/j.nme.2020.100740

Title: Impact of seeded plasma impurities on D retention in RAFM steels

Journal Article · Fri May 01 00:00:00 EDT 2020 · Nuclear Materials and Energy

DOI:https://doi.org/10.1016/j.nme.2020.100740· OSTI ID:1603710

; Tokitani, M.;

; Nagata, D.; Golubeva, A. V.; Doerner, R. P.

The effect of He seeding (He⁺ ion fraction, c_He+, of ~5 and ~10%) to D plasma (ion flux ~ 1.5–2 × 10²¹ m^-2s^-1, sample temperature ~ 373 K, and incident ion energy ~ 100 eV) on D retention in various reduced-activation ferritic/martensitic (RAFM) steels is investigated in the PISCES-A linear plasma device. The D retention, quantified with thermal desorption spectroscopy, is found to decrease with increasing c_He+. The He seeding leads to the formation of cone structures on the surface. Inside and below the cones, high-density He bubbles are observed with transmission electron microscopy, which are thought to be, at least partly, responsible for the reduction of D retention. The D retention is also reduced with Ar seeding, while N₂ seeding results in a significant increase in the D retention.

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

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-07ER54912

OSTI ID:: 1603710

Alternate ID(s):: OSTI ID: 1800532

Journal Information:: Nuclear Materials and Energy, Journal Name: Nuclear Materials and Energy Vol. 23 Journal Issue: C; ISSN 2352-1791

Publisher:: ElsevierCopyright Statement

Country of Publication:: Netherlands

Language:: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
54 ENVIRONMENTAL SCIENCES
Nuclear Science & Technology
RAFM steel
Deuterium retention
Impurity seeding

Title: Impact of seeded plasma impurities on D retention in RAFM steels

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