[3L01-07] Fusion Instrument Engineering

[3L06] Effect of pressure on gas retention behavior in bubbles for beryllium

*Yutaka Sugimoto¹, Kazutomo Hara¹, Kouhei Sano¹, Mitsutaka Haruta², Hiroki Kurata², Jaehawan Kim³, Nakamichi Nakamichi³, Mitsutaka Miyamoto¹ (1. Shimane University, 2. Kyoto Univ., 3. QST)

Keywords:Nuclear fusion reactor, Plasma facing materials, Beryllium, Gas retention property, Microstructure

Beryllium will be used as the first wall in ITER. The bubbles formed in beryllium under high dose hydrogen isotopes and helium irradiations are known to relate to void swelling and gas retention behavior. In this study, deuterium and helium gases inside bubbles were quantitatively evaluated with high accuracy and high spatial resolution under annealing by scanning transmission electron microscopy combined with electron energy loss spectroscopy (STEM-EELS).