[1O01-07] Tungsten Materials (Behavior of Hydrogen Isotope)

[1O01] Comparison of hydrogen isotope retention in divertor tiles of JET with ITER-Like Wall exposed during 2011-2012 and 2015-2016 campaigns

*Yasuhisa Oya¹, Suguru Masuzaki², Masayuki Tokitani², Meko Nakata¹, Fei Sun¹, Makoto Oyaidzu³, Takumi Hayashi³, Nobuyuki Asakura³, Teppei Otsuka⁴, Anna M. Widdowson⁵ (1. Shizuoka Univ., 2. NIFS, 3. QST, 4. Kindai Univ., 5. Culham Science Centre)

Keywords:JET ILW, Hydrogen isotope retention behavior, TDS, Divertor tiles, Nuclear Fusion

Hydrogen isotope retentions in divertor tiles of JET with ITER-Like Wall exposed during 2011-2012 and 2015-2016 campaigns were compared. It was found that the major D desorptionwere located at 620 K and 800 K, which were consistent with the data for ILW-1. However, the total D retention was increased.The XPS analysis showed that major elements on the surface was Be with forming oxide state with co-existence of W. Carbon was found mainly on the outer divertor tiles.