Speaker
Fumitaka Ishikawa
(Tokai University)
Description
Tungsten is important candidates for plasma-facing component applications on the development of magnetic fusion reactors. Particularly, it is important to understand the behavior of hydrogen isotopes in tungsten of the diverter wall material. In this study, we have performed the irradiation experiments using deuterium and helium mixed plasma in order to investigate the deuterium retention and transmission properties in the tungsten material. In the irradiation experiment, it was carried out using the linear divertor simulator TPD-SheetIV. Samples were positioned at the end of the plasma column. Used as samples is ITER grade tungsten in the form of square plate with the thickness 1mm, was annealed to adjust the crystal grain boundaries. The deuterium transmission property of the tungsten material was investigated by a titanium plate which is mounted behind the tungsten as deuterium storage material. The plasma was irradiated to the sample is 4 types of deuterium plasma only and the D-He mixed plasma (helium 0%, 5%, 10%, 15%). The mixing ratio of helium was measured using an omegatron mass analyzer. The retention and transmission properties were measured as function of the irradiation time (15 minutes, 1 hour, 2 hours). In addition, these properties after the irradiation is examined with a TDS. When the gas flow rate of the helium is increased, amount of deuterium in tungsten is decreased and amount of deuterium in titanium is increased. This indicates that deuterium transmission property in the tungsten are influenced by the helium gas ratio.
Co-authors
Akira Tonegawa
(Tokai University, 4-1-1, Kitakaname, Hiratsuka, Kanagawa, Japan)
Fumitaka Ishikawa
(Tokai University, 4-1-1, Kitakaname, Hiratsuka, Kanagawa, Japan)
Kazutaka Kawamura
(Tokai University, 4-1-1, Kitakaname, Hiratsuka, Kanagawa, Japan)
Kohnosuke Sato
(Chubu Electirc Power Co. Inc., 20-1, Kitasekiyama, Ohdaka, Aichi, Japan)
Takaaki Iijima
(Tokai University, 4-1-1, Kitakaname, Hiratsuka, Kanagawa, Japan)
Toshikio Takimoto
(Tokai University, 4-1-1, Kitakaname, Hiratsuka, Kanagawa, Japan)
Yoshihito Matsumura
(Tokai University, 4-1-1, Kitakaname, Hiratsuka, Kanagawa, Japan)
