The high-flux effect on deuterium retention in TiC and TaC doped tungsten at high temperatures

JOURNAL OF NUCLEAR MATERIALS

卷:494

Article

Zibrov, Mikhail^1,2,3,4,5  Bystrov, Kirill²  Mayer, Matej¹  Morgan, Thomas W.²  Kurishita, Hiroaki⁶ 

[1] Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany

[2] DIFFER Dutch Inst Fundamental Energy Res, Zaale 20, NL-5612 AJ Eindhoven, Netherlands

[3] Univ Ghent, Dept Appl Phys, Sint Pietersnieuwstr 41, B-9000 Ghent, Belgium

[4] Tech Univ Munich, Phys Dept E28, James Franck Str 1, D-85748 Garching, Germany

[5] Natl Res Nucl Univ, MEPhI Moscow Engn Phys Inst, Kashirskoe Shosse 31, Moscow 115409, Russia

[6] Tohoku Univ, IMR, Int Res Ctr Nucl Mat Sci, Oarai, Ibaraki 3111313, Japan

关键词: Tungsten;    Deuterium retention;    Surface modifications;    Blistering;    Thermal desorption;   

DOI  :  10.1016/j.jnucmat.2017.07.028

来源: Elsevier

【 摘 要 】

Samples made of tungsten (W) doped either with titanium carbide (W-1.1TiC) or tantalum carbide (W-3.3TaC) were exposed to a low-energy (40 eV/D), high-flux (1.8(-5) x 10(23) D/m(2)s) deuterium (D) plasma at temperatures of about800 K, 1050 K, and 1250 K to a fluence of about1 x 10(27) D/m(2). The deuterium (D) inventory in the samples was examined by nuclear reaction analysis and thermal desorption spectroscopy. At 800 K the D bulk concentrations and total D inventories in W-1.1TiC and W-3.3TaC were more than one order of magnitude higher compared to that in pure polycrystalline W. At 1050 K and 1250 K the D concentrations in all types of samples were very low (<= 10(-5) at. fr.); however the D inventories in W-1.1TiC were significantly higher compared to those in W-3.3TaC and pure W. It is suggested that D trapping inside the carbide precipitates and at their boundaries is essential at high temperatures and high incident fluxes, especially in W-1.1TiC. (C) 2017 EURATOM. Published by Elsevier B.V. All rights reserved.

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