Development of tungsten monoblock technology for ITER full-tungsten divertor in Japan

関 洋治; 江里 幸一郎; 鈴木 哲; 横山 堅二; 毛利 憲介; 平井 武志*; Escourbiac, F.*; Kuznetsov, V.*

Proceedings of 25th IAEA Fusion Energy Conference (FEC 2014) (CD-ROM), 8 Pages, 2014/10

Through R&D for a plasma facing unit (PFU) of a full-tungsten (W) ITER divertor, Japan Atomic Energy Agency (JAEA) succeeded in demonstrating the durability of the W divertor which endured a repetitive heat load of MW/m without macroscopic cracks. At the beginning of this activity, the bonding technology of armor to heat sink was one of the most important key issues in a manufacturing process. JAEA improved the bonding process of the W divertor mock-ups. At first the bonding between the W armor and the copper interlayer (Cu) is performed by using several technologies, such as "Direct casting " or "Diffusion bonding" or "HIP bonding". Then the brazing between the Cu and the cooling pipe is done. Then the rejection rate due to those bonding processes has been significantly been reduced. As a performance test for the bonding and a heat removal capability, the high heat flux (HHF) testing was carried out for 6 small-scale mock-ups for the R&D of the full-W ITER divertor. Moreover, a W part of 4 full-scale prototype PFUs were also tested. In the tests, all of the W monoblocks endured the repetitive heat load of MW/m cycles and MW/m cycles without the macroscopic crack, which strongly encourages the realization of the full-W divertor target from the start of the operation in ITER. This paper presents the latest R&D activities on the full-W ITER divertor in JAEA.

An Improved system for shoot regeneration from stem explants of Lombardy poplar ( L. var. Koehne)

Biswas, K.; 毛利 武*; 古川原 聡*; 長谷 純宏; 鳴海 一成; 大野 豊

American Journal of Plant Sciences, 3(9), p.1181 - 1186, 2012/09

https://doi.org/10.4236/ajps.2012.39143

We developed a system for the regeneration of Lombardy poplar ( L. var. ) shoots from internodal stem explants. Using this system, shoots regenerated from 87% of the stem explants placed on Murashige and Skoog (MS) medium supplemented with 0.1 mg/L indole-3-acetic acid and 0.5 mg/L benzylaminopurine without undergoing callus formation. About 80% of the regenerated shoots developed roots on MS medium supplemented with 0.5 mg/L indole-3-butyric acid and 0.02 mg/L 1-naphthylacetic acid. The protocol presented here is simple and economical because it does not rely on pre-incubation in callus induction medium or repeated subculture in shoot induction medium containing -zeatin, an expensive substance. The regeneration system presented here could be used for evaluation of radiation sensitivity for Lombardy poplar tissues.

Design study of fusion DEMO plant at JAERI

飛田 健次; 西尾 敏; 榎枝 幹男; 佐藤 正泰; 礒野 高明; 櫻井 真治; 中村 博文; 佐藤 聡; 鈴木 哲; 安堂 正己; et al.

Fusion Engineering and Design, 81(8-14), p.1151 - 1158, 2006/02

https://doi.org/10.1016/j.fusengdes.2005.08.058

原研における発電実証プラント設計検討では、中心ソレノイド(CS)の機能に着目して3つの設計オプションを検討中である。これらのうち、主案はCSの機能をプラズマ形状制御に限定してコンパクトにすることによりトロイダル磁場コイルの軽量化を図ったものであり、この設計オプションの場合、主半径5.5m程度のプラズマで3GWの核融合出力を想定する。本プラントでは、NbAl導体による超伝導コイル,水冷却固体増殖ブランケット,構造材として低放射化フェライト鋼,タングステンダイバータなど近未来に見通しうる核融合技術を利用する。プラントの設計思想及び要素技術に対する要請を述べる。

核融合動力炉ブランケット・システムの技術的検討

東稔 達三; 関 昌弘; 湊 章男; 堀江 知義; 山本 孝*; 田中 義久*; 阿部 忠*; 渡部 隆*; 小林 武司; 佐藤 瓊介*; et al.

JAERI-M 87-017, 737 Pages, 1987/03

JAERI-M-87-017.pdf:16.73MB

本報告では、トカマク型DT炉の発電用増殖ブランケットシステム概念の代表的候補の比較評価の為に行なった技術検討結果について述べる。ブランケットには、(1)トリチウム燃料の自己供給,(2)In-Situのトリチウム連続回収と低いインベントリ、(3)高い発電効率を与える高温除熱、(4)高稼働率を与える信頼性の高い構造等が要求される。これらを満たすブランケットの性能は、構造材/増殖材/冷却材/中性子増倍材の選択によって支配される。これらの材料の組合わせの主要候補としてPCA/LiO/HO/Be,Mo-alloy/LiO/He/Be,Mo-alloy/LiAlO/He/Be,V-alloy/Li/Li/none,及びMo-alloy/Li/He/none を選んだ。ブランケット概念の相互比較評価は、トリチウム回収システム、冷却/発電系統、及び遠隔操作による分解組立てを考慮したト-ラス分割構成法も含めて総合的に検討を行なった。

Developing protocol for screening of drought/salt tolerant mutants with ion-beam mutagenesis in poplar ( L. var. Koehne)

Biswas, K.; 鳴海 一成; 大野 豊; 毛利 武*; 古川原 聡*

no journal, , 

For screening of drought/salt tolerant poplar mutants, regeneration system had been established. About 87% of the shoot explants produced regenerated shoots in shoot regeneration medium, whereas 77% regenerated shoots developed roots in root induction medium. Survival rate of the regenerated plants in soil was about 88%.Suitable dose of ion beams to screen mutants ranged between 2.5 Gy to 3 Gy for shoot explants in poplar. regenerated wild type poplar shoots did not develop any root system in rooting medium supplemented by 75 mM NaCl. Thus, the initial goal of this study to screen drought/salt tolerant mutants could be achieved by the use of well-established ion-beam facilities at Japan Atomic Energy Agency.

Lombardy poplar ( L. var. ) an important woody plant species for ionizing-radiation mutagenesis

Biswas, K.; 長谷 純宏; 鳴海 一成; 大野 豊; 毛利 武*; 古川原 聡*

no journal, , 

spp. are widely employed worldwide for windbreaks and landscaping beside potential to enhance wood supplies for the plywood, hardboard, pulp, paper industries and various other purposes. Here, we present a system of screening salt/drought tolerant mutants with a combination of in vitro regeneration and ionizing-radiation mutagenesis in poplar. About 87% of the shoot explants produced shoots in shoot regeneration medium, whereas 77% regenerated shoots developed roots in root induction medium. Dose response relationship curve with in vitro regenerate shoots were establish for ion beams and rays. As shoulder point, 2.5 Gy of ion beams and 5 Gy of rays seem to be effective for mutagenic treatment to regenerate shoots.