Investigation and simulation of the advanced divertor design for the large power handling in the fusion reactor

• Project/Area Number: 25420899
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: Asakura Nobuyuki 国立研究開発法人日本原子力研究開発機構, 核融合研究開発部門 六ヶ所核融合研究所, 研究主幹 (10222572)
• Co-Investigator(Kenkyū-buntansha): HOSHINO kazuo 日本原子力研究開発機構, 核融合研究開発部門六ヶ所核融合研究所, 研究員 (50513222)
• Co-Investigator(Renkei-kenkyūsha): SHIMIZU katsuhiro 日本原子力研究開発機構, 核融合研究開発部門那珂核融合研究所, 研究嘱託 (30391262) ; UTHO hiroyasu 日本原子力研究開発機構, 核融合研究開発部門六ヶ所核融合研究所, 研究員 (50566247) ; SOMEYA yoji 日本原子力研究開発機構, 核融合研究開発部門六ヶ所核融合研究所, 任期付き研究員 (20589345) ; TOBITA kenji 日本原子力研究開発機構, 核融合研究開発部門六ヶ所核融合研究所, 研究主幹 (50354569) ; NAKAMURA makoto 日本原子力研究開発機構, 核融合研究開発部門六ヶ所核融合研究所, 任期付き研究員 (80462886) ; SAKAMOTO yoshiteru 日本原子力研究開発機構, 核融合研究開発部門六ヶ所核融合研究所, 研究副主幹 (30354583) ; OHNO noriyasu 名古屋大学, 大学院工学研究科, 教授 (60203890) ; MASUZAKI suguru 核融合科学研究所, 研究力強化戦略室, 教授 (80280593) ; KOBAYASHI masahiro 核融合科学研究所, ヘリカル研究部, 准教授 (30399307) ; TANAKA hirohiro 核融合科学研究所, ヘリカル研究部, 助教 (60609981)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000); Fiscal Year 2015: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: 先進ダイバータ / 原型炉設計 / スーパーＸ型ダイバータ / ダイバータシミュレーション / 非接触プラズマ / 放射損失 / インターリンクコイル / 原型炉概念設計 / 不純物ガス入射 / 国際情報交換 / 米国 / 雪結晶型ダイバータ / プラズマ平衡磁場

Outline of Final Research Achievements

Divertor design appropriate for a DEMO reactor is a crucial for handling the large power exhaust. Advanced divertors, which modify the magnetic configuration by applying additional divertor coils, has been investigated both from the physics and engineering viewpoints. Calculation code for the advanced divertor configurations was developed. The concept of superconductor divertor coils installed inside the toroidal field coil was proposed, and their locations and currents were determined. Divertor plasma simulation for the advanced divertor has been performed under the DEMO conditions; the divertor plasma temperature became low (1 eV), producing fully detached plasmas efficiently, and the peak heat load was reduced by 30-50% of the conventional divertor. Future issues are clarified; technology and engineering for the interlink-coil and their fabrication are crucial. Improvements of magnetic and geometrical configurations and accuracy of the simulation such as diffusion are necessary.

Research Products

• [Journal Article] Simulation Study of Power Exhaust in Short Super-X Divertor for a Tokamak Reactor (2015)
  • Author(s): N. Asakura, K. Hoshino, K. Shimizu, K. Shinya, H. Utoh, S. Tokunaga, K. Tobita, N. Ohno
  • Journal Title: Journal of Nuclear Materials Volume: 463 Pages: 1238-1242
  • DOI: 10.1016/j.jnucmat.2015.01.068
  • Peer Reviewed
• [Journal Article] Investigation of Advanced Divertor Magnetic Configuration for Demo Tokamak Reactor (2013)
  • Author(s): Nobuyuki Asakura, Kichiro Shinya, Kenji Tobita, Kazuo Hoshino, Katsuhiro Shimizu, Hiroyasu Utoh, Youji Someya, Makoto Nakamura, Noriyashu Ohno, Masahiro Kobayashi, Hirohiko Tanaka
  • Journal Title: Transactions of Fusion Science and Technology Volume: 63 Pages: 70-75
  • Peer Reviewed
• [Presentation] 核融合出力1.5GWレベルの原型炉におけるダイバータの物理及び工学概念設計の現状 (2015)
  • Author(s): 朝倉伸幸, 星野一生, 宇藤裕康, 染谷洋二, 徳永晋介, 清水勝宏, 鈴木哲, 飛田健次, 大野哲靖, 上田良夫, 木村晃彦, 日渡良爾
  • Organizer: 第32回プラズマ・核融合学会 年会
  • Place of Presentation: 名古屋大学東山キャンパス（愛知県・ 名古屋市）
  • Year and Date: 2015-11-24
• [Presentation] Conceptual Design Study of the Divertor and Power Exhaust for 1.5-2 GW Fusion Power Demo Reactor (2015)
  • Author(s): Nobuyuki Asakura, Kazuo Hoshino,Hiroyasu Utoh, Yoji Someya, Suzuki Satoshi, Ezato Koichiro, Shinsuke Tokunaga, Katsuhiro, Shimizu, Sakamoto Yoshiteru, Nakamura Makoto, Kenji Tobita, Ueda Yoshio, Noriyashu Ohno, Kimura Akihiko
  • Organizer: 12th International Symposium on Fusion Nuclear Technology (ISFNT)
  • Place of Presentation: Jeju Island (South Korea)
  • Year and Date: 2015-09-14
  • Int'l Joint Research / Invited
• [Presentation] 原型炉における先進ダイバータ「short super-X divertor」の概念設計研究討 (2014)
  • Author(s): 朝倉伸幸、星野一生、宇藤 裕康、新谷吉郎、徳永晋介、清水勝宏、染谷洋二、大野哲靖、飛田健次
  • Organizer: Plasma Conference 2014
  • Place of Presentation: 朱鷺メッセ、新潟
  • Year and Date: 2014-11-18 – 2014-11-21
• [Presentation] Physics and Engineering Studies of the Advanced Divertor for a Fusion Reactor (2014)
  • Author(s): Nobuyuki Asakura, Kazuo Hoshino, Hiroyasu Utoh, Kichiro Shinya, Youji Someya, Katsuhiro Shimizu, Shinsuke Tokunaga, Kenji Tobita, Noriyashu Ohno, Masahiro Kobayashi, Hirohiko Tanaka
  • Organizer: 25th IAEA Fusion Energy Conference (FEC) 2014
  • Place of Presentation: Park Inn by Radisson Hotel, St Petersburg, Russia
  • Year and Date: 2014-10-13 – 2014-10-18
• [Presentation] 原型炉における先進ダイバータ “Short Super-X Divertor”の検討 (2014)
  • Author(s): 朝倉伸幸、星野一生、宇藤 裕康、染谷洋二、清水勝宏、新谷吉郎、徳永晋介、飛田健次、大野哲靖
  • Organizer: 第10回 核融合エネルギー連合講演会
  • Place of Presentation: つくば国際会議場（エポカルつくば）、つくば
  • Year and Date: 2014-06-19 – 2014-06-20
• [Presentation] Simulation Study of Power Load with Impurity Seeding in Advanced Divertor Configurations for a Tokamak Reactor (2014)
  • Author(s): Nobuyuki Asakura, Kazuo Hoshino, Katsuhiro Shimizu, Shinsuke Tokunaga, Kichiro Shinya, Hiroyasu Utoh, Noriyashu Ohno
  • Organizer: 21st Int. Conf. Plasma Surface Interactions in Controlled Fusion Devices
  • Place of Presentation: Ishikawa ONGAKUDO, Kanazawa, Japan
  • Year and Date: 2014-05-26 – 2014-05-30
• [Presentation] トカマク原型炉の先進ダイバータ概念設計における物理および工学要素の検討 (2013)
  • Author(s): 朝倉伸幸、新谷吉郎、星野一生、宇藤 裕康、染谷洋二、飛田健次、徳永晋介、中村誠、坂本宜照、大野哲靖
  • Organizer: プラズマ・核融合学会 第30回年会
  • Place of Presentation: 東京都 大岡山 東京工業大学
• [Presentation] Physics and Engineering Studies of Advanced Divertors for Tokamak Demo (2013)
  • Author(s): Nobuyuki Asakura, Kazuo Hoshino, Hiroyasu Utoh, Kichiro Shinya, Youji Someya, Katsuhiro Shimizu, Kenji Tobita, Shinsuke Tokunaga, Noriyashu Ohno
  • Organizer: 2nd IAEA DEMO Programme Workshop
  • Place of Presentation: IAEA Headquarters, Vienna, Austria
• [Remarks] 研究開発成果検索・閲覧システム（JOPSS）
  • URL: http://jolissrch-inter.tokai-sc.jaea.go.jp/search/servlet/interSearch