Surface blistering and deuterium retention in tungsten exposed to low-energy deuterium plasma at different temperatures

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:450

Article; Proceedings Paper

Qin, Shaoyang^1,2  Wang, Jinliang¹  Gao, Liang³  Cheng, Long^1,2  Yuan, Yue^1,2  Jacob, Wolfgang³  Lu, Guang-Hong^1,2 

[1] Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China

[2] Beihang Univ, Beijing Key Lab Adv Nucl Mat & Phys, Beijing 100191, Peoples R China

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

关键词: Tungsten;    Surface blistering;    Deuterium retention;    Temperature dependence;   

DOI  :  10.1016/j.nimb.2018.04.012

来源: Elsevier

【 摘 要 】

Surface morphology and deuterium retention in tungsten have been examined after exposure to a low-energy deuterium plasma with an ion fluence of 6.0 x 10(24) D/m(2) at various temperatures. Optical differential interference contrast microscope and scanning electron microscope equipped with focused ion beam were applied for surface observations. D (He-3, p) He-4 nuclear reaction at He-3 energies varying from 0.5 to 4.5 MeV was used to determine the deuterium depth distributions within the depth of 8.0 mu m. The thermal desorption spectroscopy was applied for deuterium retention measurement. The observed surface blistering and deuteriurn retention are found to strongly depend on the exposure temperature. At 230 K, many small blisters are formed on the tungsten surface. As the exposure temperature increases to 370 K, the blisters become sparser and larger. At 520 K no blisters appear. The deuterium retention is 1.4 x 10(20) D/m(2) at 230 K. Then it increases to 1.1 x 10(21) D/m(2) as the exposure temperature rises to 370 K, and decreases to 2.3 x 10(20) D/m(2) at 520 K.

【 授权许可】

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