Reduced deuterium retention in simultaneously damaged and annealed tungsten

JOURNAL OF NUCLEAR MATERIALS

卷:494

Article

Simmonds, M. J.¹  Wang, Y. Q.²  Barton, J. L.³  Baldwin, M. J.¹  Yu, J. H.¹  Doerner, R. P.¹  Tynan, G. R.^1,4 

[1] Univ Calif San Diego, Ctr Energy Res, 9500 Gilman Dr, La Jolla, CA 92093 USA

[2] Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM 87545 USA

[3] Sandia Natl Labs, Energy Innovat Dept, Livermore, CA 94550 USA

[4] Univ Calif San Diego, Dept Mech & Aerosp Engn MAE, 9500 Gilman Dr, La Jolla, CA 92093 USA

关键词: Tungsten;    Dynamic annealing;    Deuterium;    Retention;    Recovery;    Concurrent ion beam damage;    NRA;    TDS;   

DOI  :  10.1016/j.jnucmat.2017.06.010

来源: Elsevier

【 摘 要 】

Deuterium (D) retention in polycrystalline tungsten (W) with copper (Cu) ion damage concurrently produced at elevated surface temperature is investigated. An in situ heated stage held W samples at a controlled temperature up to 1243 K, which were subjected to displacement damage produced by 3.4 MeV Cu ions. D retention is subsequently explored by exposure of the W samples held at 383 K to a D-2 plasma ion fluence of 1024 D+/m(2). Nuclear reaction analysis (NRA), utilizing the D(He-3,p)He-4 nuclear reaction, is used to probe the D concentration in the near surface up to 6 mm. Thermal desorption spectroscopy (TDS) is used to measure outgassed HD and D-2 molecules to determine the bulk D concentration. Both NRA and TDS measure a significant reduction in D retention for samples damaged at elevated temperature. TDS quantitatively shows that the lowest energy trap remains largely unaffected while higher energy traps, induced by Cu ions, are annealed and approach intrinsic concentrations as the temperature during ion damage approaches 1243 K. Analysis of TDS data yields an activation energy of (0.10 +/- 0.02) eV for recovery of ion-damage induced traps at elevated temperature. (C) 2017 Elsevier B.V. All rights reserved.

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