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JAEA Reports

Conceptual design and related R&D on ITER mechanical based primary pumping system

Tanzawa, Sadamitsu; Hiroki, Seiji; Abe, Tetsuya; Shimizu, Katsusuke*; Inoue, Masahiko*; Watanabe, Mitsunori*; Iguchi, Masashi*; Sugimoto, Tomoko*; Inohara, Takashi*; Nakamura, Junichi*

JAEA-Technology 2008-076, 99 Pages, 2008/12

JAEA-Technology-2008-076.pdf:35.19MB

The primary vacuum pumping system of the International Thermonuclear Experimental Reactor (ITER) exhausts a helium (He) ash resulting from the DT-burn with excess DT fueling gas, as well as performing a variety of functions such as pump-down, leak testing and wall conditioning. A mechanical based vacuum pumping system has some merits of a continuous pumping, a much lower tritium inventory, a lower operational cost and easy maintenance, comparing with a cryopump system, although demerits of an indispensable magnetic shield and insufficient performance for hydrogen (H$$_{2}$$) pumping are well recognized. To overcome the demerits, we newly fabricated and tested a helical grooved pump (HGP) unit suitable for H$$_{2}$$ pumping at the ITER divertor pressure of 0.1-10 Pa. Through this R&D, we successfully established many design and manufacturing databases of large HGP units for the lightweight gas pumping. Based on the databases, we conceptually designed the ITER vacuum pumping system mainly comprising the HGP with an optimal pump unit layout and a magnetic shield. We also designed conceptually the reduced cost (RC)-ITER pumping system, where a compound molecular pump combining turbine bladed rotors and helical grooved ones was mainly used. The ITER mechanical based primary pumping system proposed has eventually been a back-up solution, whereas a cryopump based one was formally selected to the ITER for construction.

Journal Articles

Construction of monitoring system for biological effects of local ionizing radiation using the nematode ${it C. elegans}$

Higashitani, Atsushi*; Sugimoto, Tomoko*; Mori, Chihiro*; Suzuki, Yoko*; Saito, Rumiko*; Ichishi, Eiichiro*; Sakashita, Tetsuya; Hamada, Nobuyuki*; Wada, Seiichi*; Kakizaki, Takehiko; et al.

JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 113, 2007/02

no abstracts in English

Journal Articles

Cell cycle arrest and apoptosis in ${it Caenorhabditis elegans}$ germline cells following heavy-ion microbeam irradiation

Sugimoto, Tomoko*; Dazai, Kumiko*; Sakashita, Tetsuya; Funayama, Tomoo; Wada, Seiichi; Hamada, Nobuyuki*; Kakizaki, Takehiko; Kobayashi, Yasuhiko; Higashitani, Atsushi*

International Journal of Radiation Biology, 82(1), p.31 - 38, 2006/01

 Times Cited Count:39 Percentile:92.82(Biology)

no abstracts in English

Oral presentation

Radiation effect and bystander effect of heavy ion particle irradiation on apoptosis in ${it Caenorhabditis elegans}$ germ cell development

Higashitani, Atsushi*; Sugimoto, Tomoko*; Dazai, Kumiko*; Mori, Chihiro*; Sakashita, Tetsuya; Funayama, Tomoo; Kakizaki, Takehiko; Hamada, Nobuyuki*; Wada, Seiichi*; Kobayashi, Yasuhiko

no journal, , 

no abstracts in English

Oral presentation

Study of biological responses to ionizing radiation in the germline cells of ${it C. elegans}$

Mori, Chihiro*; Sugimoto, Tomoko*; Dazai, Kumiko*; Sakashita, Tetsuya; Funayama, Tomoo; Kakizaki, Takehiko; Hamada, Nobuyuki*; Wada, Seiichi*; Kobayashi, Yasuhiko; Ichishi, Eiichiro*; et al.

no journal, , 

no abstracts in English

Oral presentation

Study of biological responses to heavy-ion microbeams in the nematode ${it C. elegans}$

Higashitani, Atsushi*; Mori, Chihiro*; Sugimoto, Tomoko*; Dazai, Kumiko*; Sakashita, Tetsuya; Funayama, Tomoo; Kakizaki, Takehiko; Hamada, Nobuyuki*; Wada, Seiichi*; Kobayashi, Yasuhiko

no journal, , 

no abstracts in English

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