Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 457, Issue -, Pages 213-219Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2014.11.079
Keywords
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Funding
- National Magnetic Confinement Fusion Science Program of China [2013GB109004]
- Tsinghua Scholarship for Overseas Graduate Studies
- Joint Sino-German research project [GZ 763]
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Surface modifications and deuterium retention induced in tungsten by high fluxes (10(24) m(-2) s(-1)) low energy (38 eV) deuterium ions were studied as a function of surface temperature. Blister formation was studied by scanning electron microscopy and electron backscatter diffraction, while deuterium retention was measured by thermal desorption spectroscopy. Blisters are observed on the surface exposed at different temperatures, ranging from 493 K to 1273 K. The blister density and D retention decrease with the increasing exposure temperature. The formation of blisters at high temperatures is attributed to the high flux of D plasma. At 943 K, with the increasing fluence, there is trend to the saturation of D retention and blister density. The defects caused by plasma exposure have an important effect on the D trapping and blistering behavior. The formation of blisters has a strong relationship with slipping system of tungsten. (C) 2014 Elsevier B.V. All rights reserved.
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