Latest design of liquid lithium target in IFMIF

Nakamura, Hiroo; Agostini, P.*; Ara, Kuniaki ; Cevolani, S.*; Chida, Teruo*; Ciotti, M.*; Fukada, Satoshi*; Furuya, Kazuyuki*; Garin, P.*; Gessii, A.*; Giusti, D.*; Heinzel, V.*; Horiike, Hiroshi*; Ida, Mizuho; Jitsukawa, Shiro; Kanemura, Takuji*; Kondo, Hiroo*; Kukita, Yutaka*; Lsser, R.*; Matsui, Hideki*; Micciche, G.*; Miyashita, Makoto*; Muroga, Takeo*; Riccardi, B.*; Simakov, S.*; Stieglitz, R.*; Sugimoto, Masayoshi; Suzuki, Akihiro*; Tanaka, Satoru*; Terai, Takayuki*; Yagi, Juro*; Yoshida, Eiichi; Wakai, Eiichi  

This paper describes the latest design of liquid lithium target system in IFMIF. Design requirement of the Li target is to provide a stable Li jet with a speed of 20 m/s to handle an averaged heat flux of 1 GW/m. A double reducer nozzle and a concaved flow are applied to the target design. On Li purification, a cold trap and two kinds of hot trap are applied to control impurities below permissible levels. Nitrogen concentration shall be controlled below 10 wppm by one of the hot trap. Tritium concentration shall be controlled below 1 wppm by an yttrium hot trap. To maintain reliable continuous operation, various diagnostics are attached to the target assembly. Among the target assembly, a back-plate made of RAFM is located in the most severe region of neutron irradiation (50 dpa/y). Therefore, two design options of replaceable back wall and their remote handling systems are under investigation.