Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6744286 | Fusion Engineering and Design | 2017 | 5 Pages |
Abstract
Influence of mixed material layer formation on hydrogen isotope retention in W exposed to 2014 Large Helical Device (LHD) experiment campaign was evaluated by Thermal Desorption Spectroscopy (TDS), X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM). It was found that a lot of hydrogen isotopes were trapped by the carbon-dominated mixed-material layer deposited on the plasma facing materials. Most of He was also trapped in the carbon-dominated mixed-material layer and the corresponding desorption temperature was limited to be about 600Â K, 900Â K and 1200Â K, respectively. However, the hydrogen retention behavior for erosion dominated area was clearly different from those for deposition dominated area and typical Plasma Wall Interaction (PWI) area, where He bubbles were introduced near the sample surface, leading to the introduction of various types of trapping sites in W.
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Authors
Yasuhisa Oya, Cui Hu, Hiroe Fujita, Yuki Uemura, Shodai Sakurada, Keisuke Azuma, Miyuki Yajima, Masayuki Tokitani, Suguru Masuzaki, Naoaki Yoshida, Takumi Chikada,