@misc{oai:repo.qst.go.jp:00079428,
 author = {Oya, Yasuhisa and Masuzaki, Suguru and Tokitani, Masayuki and Nakata, Moeko and Sun, Fei and Oyaizu, Makoto and Isobe, Kanetsugu and Asakura, Nobuyuki and Otsuka, Teppei and M. Widdowson, Anna and Likonen, Jari and Rubel, Marek and Oyaizu, Makoto and Isobe, Kanetsugu and Asakura, Nobuyuki},
 month = {Apr},
 note = {Evaluation of hydrogen isotopes retention in the plasma-facing components (PFC)l is required for the design of a future fusion reactor. To obtain a set of relevant data on the isotope retention and their surface state (and chemistry), the analysis of PFC from the JET tokamak with the ITER-Like Wall (JET-ILW) is both useful and important.
In previous studies, the correlation of surface chemical states and hydrogen isotope retention in the divertor samples from the first ILW campaign (ILW-1, 2011-2012, 19 h plasma operation, total energy 150 GJ) was determined. It was found that the major D desorption peaks were found at 643 K and 803 K. For samples at the strike point region, the D desorption temperature was clearly shifted towards higher T, indicating the stabilization of D trapping by higher heat load.
 In this work, the studied tiles were exposed during the 3rd campaign (ILW-3) which comprised in total 23 h of plasma with the total energy input of 245 GJ. The hydrogen isotope retention and chemical states of divertor tiles were studied by thermal desorption spectroscopy (TDS) and X-ray photoelectron spectroscopy (XPS). 
It was found that the major D desorption were 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.
 In the presentation, detailed XPS and TDS results will be shown and discuss the hydrogen isotope retention behavior in JET-ILW divertor tiles., 12 th  International Conference on Tritium Science & Technology},
 title = {Comparison of Hydrogen Isotope Retention in Divertor Tiles of JET with ITER-Like Wall Exposed during 2011- 2012 and 2015-2016 Campaigns},
 year = {2019}
}