1. Development of H, D, T Simultaneous TDS Measurement System and H, D, T Retention Behavior for DT Gas Exposed Tungsten Installed in LHD Plasma Campaign
- Author
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Shodai Sakurada, Yuki Uemura, Takumi Chikada, Hiroe Fujita, Yasuhisa Oya, Masayuki Tokitani, Yuji Hatano, Cui Hu, Miyuki Yajima, Kenta Yuyama, and Suguru Masuzaki
- Subjects
010302 applied physics ,Nuclear and High Energy Physics ,Materials science ,Hydrogen ,Thermal desorption spectroscopy ,Mechanical Engineering ,Analytical chemistry ,chemistry.chemical_element ,Tungsten ,Mass spectrometry ,01 natural sciences ,Ion source ,010305 fluids & plasmas ,Large Helical Device ,Nuclear Energy and Engineering ,chemistry ,Desorption ,0103 physical sciences ,Ionization chamber ,General Materials Science ,Civil and Structural Engineering - Abstract
All the hydrogen isotope (H, D, T) simultaneous TDS (Thermal desorption spectroscopy) measurement system (HI-TDS system) was newly designed to evaluate all hydrogen isotope desorption behavior in materials. The present HI-TDS system was operated under Ar purge gas and the H and D desorptions were observed by a quadruple mass spectrometer equipped with an enclosed ion source, although T desorption was evaluated by an ionization chamber or proportional counters. Most of the same TDS spectra for D and T were derived by optimizing the heating rate of 0.5 K sā1 with Ar flow rate of 13.3 sccm.Using this HI-TDS system, D and T desorption behaviors for implanted or DT gas exposed tungsten samples installed in LHD (Large Helical Device) at NIFS (National Institute for Fusion Science) was evaluated. It was found that major hydrogen desorption stages consisted of two temperature regions, namely 700 K and 900 K, which was consistent with the previous hydrogen plasma campaign and most of hydrogen would be trap...
- Published
- 2017
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