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Futagami, Satoshi; Hayafune, Hiroki; Enuma, Yasuhiro*; Ogumo, Shinya*; Hirayama, Tomoyuki*; Murakami, Hisatomo*
no journal, ,
no abstracts in English
Ezato, Koichiro; Suzuki, Satoshi; Seki, Yohji; Mori, Kensuke; Hirayama, Tomoyuki; Kakudate, Satoshi
no journal, ,
no abstracts in English
Seki, Yohji; Ezato, Koichiro; Suzuki, Satoshi; Yokoyama, Kenji; Yamada, Hirokazu; Hirayama, Tomoyuki
no journal, ,
Through R&D for a plasma facing unit (PFU) of an ITER full-tungsten (W) divertor, Japan Atomic Energy Agency (JAEA) succeeded in demonstrating the durability of the cyclic heat loaded W divertor which was shaped by an electrical discharge machining (EDM). To prevent melting of W, an adequate technology to meet requirements of a geometrical shape and tolerance of the PFU is one of the most important key issues in a manufacturing process. JAEA has evaluated the EDM to control the final shape tolerance of 
0.25 mm. In order to examine an effect on durability of the micro-crack due to EDM, one polished W armor without the EDM and three W armors with the EDM were exposed to cyclic thermal loads. As the result, all of the W armors endured the repetitive heat load of 20 MW/m
1000 cycles without any macro-cracks, which strongly encourages the realization of the PFU of ITER full-W divertor with various geometrical shape and high accuracy tolerance.
Seki, Yohji; Ezato, Koichiro; Suzuki, Satoshi; Yokoyama, Kenji; Yamada, Hirokazu; Hirayama, Tomoyuki
no journal, ,
JAEA, as Japan Domestic Agency (JADA), is going to manufacture one of the high heat flux components, so-called "Outer vertical targets". The plasma facing units (PFUs) of the ITER divertor are subjected to high heat flux from plasma. The tungsten armor tiles are metallurgically bonded onto cooling tubes made of copper alloy to achieve sufficient heat removal capability. In addition, geometrical tolerance of the surface of the PFUs is so tight to avoid melting of tungsten armor tiles by incident heat flux to their leading edges. As a first step, JADA has developed a full-tungsten full-scale prototype PFUs. Three-dimensional geometrical profile on the surface of the prototype PFUs was measured. The target part, which is subjected to the highest heat flux of 
among the divertor components, of all the prototype PFUs satisfied the required stringent tolerance of 
mm, which imposes that JADA achieved one of the key milestones toward the realization of the ITER divertor.
Ezato, Koichiro; Seki, Yohji; Suzuki, Satoshi; Yokoyama, Kenji; Yamada, Hirokazu; Hirayama, Tomoyuki
no journal, ,
no abstracts in English
Seki, Yohji; Ezato, Koichiro; Suzuki, Satoshi; Yokoyama, Kenji; Yamada, Hirokazu; Hirayama, Tomoyuki
no journal, ,
JAEA is in charge of manufacturing a high heat flux (HHF) component, so-called "Outer vertical targets" in ITER divertor. The plasma facing units (PFUs) of the ITER divertor are subjected to HHF from plasma. The tungsten (W) armor tiles are metallurgically bonded onto cooling tubes made of copper alloy to achieve sufficient heat removal capability. Targets of R&D for full-W divertor are (1) to manufacture of full-scale PFU and (2) to demonstrate a durability of a heat removal capability. In the R&D through the manufacturing full-scale prototype PFU, JAEA demonstrated durability of heat removal capability of W armor tiles for HHF testing of 5000 
10 MW/m
and 1000 20 MW/m. After the HHF testing, gaps of about 0.5 mm between the W tiles decreased by about 
because the W tile was deformed by plastic strain. This paper reports deformation of shape on W surface in detail.
Miyagawa, Takayuki*; Yamamoto, Tomohiko; Miyazaki, Masashi; Okamura, Shigeki*; Fukasawa, Tsuyoshi*; Fujita, Satoshi*; Hirayama, Tomoyuki*
no journal, ,
no abstracts in English
Okamura, Shigeki*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Miyazaki, Masashi; Hirayama, Tomoyuki*; Fukasawa, Tsuyoshi*; Fujita, Satoshi*; Somaki, Takahiro*; Endo, Naoki*
no journal, ,
no abstracts in English
Hirayama, Tomoyuki*; Somaki, Takahiro*; Nakamura, Misaki*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Miyazaki, Masashi; Fukasawa, Tsuyoshi*; Fujita, Satoshi*
no journal, ,
no abstracts in English
Morobishi, Ryota*; Yukawa, Masaki*; Hirayama, Tomoyuki*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Miyazaki, Masashi; Fukasawa, Tsuyoshi*
no journal, ,
no abstracts in English
Nakamura, Misaki*; Yukawa, Masaki*; Hirayama, Tomoyuki*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Miyazaki, Masashi; Fukasawa, Tsuyoshi*
no journal, ,
no abstracts in English
Yukawa, Masaki*; Somaki, Takahiro*; Hirayama, Tomoyuki*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Miyazaki, Masashi; Fukasawa, Tsuyoshi*
no journal, ,
no abstracts in English
Somaki, Takahiro*; Yukawa, Masaki*; Hirayama, Tomoyuki*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Miyazaki, Masashi; Fukasawa, Tsuyoshi*
no journal, ,
no abstracts in English
Endo, Naoki*; Adachi, Yoshihiko*; Hirayama, Tomoyuki*; Yukawa, Masaki*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Miyazaki, Masashi; Fukasawa, Tsuyoshi*
no journal, ,
no abstracts in English
Yamamoto, Tomohiko; Miyazaki, Masashi; Miyagawa, Takayuki*; Okamura, Shigeki*; Fukasawa, Tsuyoshi*; Fujita, Satoshi*; Hirayama, Tomoyuki*
no journal, ,
no abstracts in English
Okamura, Shigeki*; Hirayama, Tomoyuki*; Yokoi, Shinobu*; Somaki, Takahiro*; Miyagawa, Takayuki*; Uchita, Masato*; Yamamoto, Tomohiko; Miyazaki, Masashi; Fukasawa, Tsuyoshi*; Fujita, Satoshi*
no journal, ,
no abstracts in English
Fukasawa, Tsuyoshi*; Hirayama, Tomoyuki*; Hirota, Akihiko*; Somaki, Takahiro*; Miyagawa, Takayuki*; Uchita, Masato*; Yamamoto, Tomohiko; Miyazaki, Masashi; Okamura, Shigeki*; Fujita, Satoshi*
no journal, ,
no abstracts in English
Uchita, Masato*; Yamamoto, Tomohiko; Miyazaki, Masashi; Watakabe, Tomoyoshi; Okamura, Shigeki; Fukasawa, Tsuyoshi*; Fujita, Satoshi*; Hirayama, Tomoyuki*
no journal, ,
no abstracts in English
Okamura, Shigeki; Uchita, Masato*; Yamamoto, Tomohiko; Miyazaki, Masashi; Watakabe, Tomoyoshi; Hirayama, Tomoyuki*; Fukasawa, Tsuyoshi*; Fujita, Satoshi*; Somaki, Takahiro*; Endo, Naoki*
no journal, ,
no abstracts in English
Hirayama, Tomoyuki*; Somaki, Takahiro*; Nakamura, Misaki*; Uchita, Masato*; Yamamoto, Tomohiko; Miyazaki, Masashi; Watakabe, Tomoyoshi; Fukasawa, Tsuyoshi*; Fujita, Satoshi*
no journal, ,
no abstracts in English