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

JOURNAL OF NUCLEAR MATERIALS

卷:512

Article

Zaloznik, Anze¹  Baldwin, Matthew J.²  Doerner, Russell P.²  Schwarz-Selinger, Thomas³  Brezinsek, Sebastijan⁴ 

[1] Jozef Stefan Inst, Jamova Cesta 39, Ljubljana 1000, Slovenia

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

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

[4] Forschungszentrum Julich, Inst Energie & Klimaforsch Plasmaphys, D-52425 Julich, Germany

关键词: D retention;    Be co-deposits;    Helium;   

DOI  :  10.1016/j.jnucmat.2018.09.032

来源: Elsevier

【 摘 要 】

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 - alpha He plasma mixtures (0 < alpha < 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. (C) 2018 The Authors. Published by Elsevier B.V. All rights reserved.

【 授权许可】

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