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TEM analysis of high temperature annealed W nanostructure surfaces
Authors:Shin Kajita  Naoaki Yoshida  Reiko Yoshihara  Noriyasu Ohno  Takanori Yokochi  Masayuki Tokitani  Shuichi Takamura
Affiliation:1. EcoTopia Science Institute, Nagoya University, Nagoya 464-8603, Japan;2. Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan;3. Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan;4. National Institute for Fusion Science, Toki, Gifu 509-5292, Japan;5. Aichi Institute of Technology, Yakusa-cho, Toyota 470-0392, Japan;1. EcoTopia Science Institute, Nagoya University, Nagoya 464-8603, Japan;2. Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan;1. Graduate School of Engineering, Osaka University, Suita, Osaka, Japan;2. National Institute for Fusion Science, Oroshi-cho, Toki, 509-5292, Japan;1. National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Kashirskoe shosse 31, 115409, Moscow, Russia;2. University of California at San Diego, La Jolla, CA 92093, USA;1. Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan;2. EcoTopia Science Institute, Nagoya University, Nagoya 464-8603, Japan;1. Department of Energy Engineering and Science, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya-shi, Aichi, Japan;2. Hydrogen Isotope Research Center, Toyama University, 3190 Gofuku, Toyama-shi, Toyama, Japan;3. EcoTopia Science Institute, Furo-cho, Chikusa-ku, Nagoya-shi, Aichi, Japan
Abstract:Helium plasma irradiation and electron heating experiments were conducted using tungsten in the divertor simulator NAGDIS-II. Helium plasma irradiation to tungsten led to the formation of nanostructures on the surface, while the nanostructures were annihilated after the potential of the specimen was changed to positive for several 10 min so that electrons irradiated the sample without ion irradiation. The specimens were analyzed in detail by transmission electron microscope with the help of focused ion beam technique. It is revealed that the helium nano-bubbles still remained even after the nanostructures were disappeared from the surface. Porosity of the nanostructured tungsten was measured from the TEM images.
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