Development of the Supersonic Jet Pump for Realization of Vacuum Pumping in the Fusion Reactor

• Project/Area Number: 15H04233
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: National Institute for Fusion Science
• Principal Investigator: Miyazawa Junichi 核融合科学研究所, ヘリカル研究部, 教授 (50300728)
• Co-Investigator(Renkei-kenkyūsha): GOTO Takuya 核融合科学研究所, ヘリカル研究部, 助教 (30509518) ; SAKAMOTO RYuichi 核融合科学研究所, ヘリカル研究部, 教授 (10290917) ; MIURA Hideaki 核融合科学研究所, ヘリカル研究部, 教授 (40280599) ; TANAKA Masahiro 核融合科学研究所, ヘリカル研究部, 准教授 (00435520) ; SAGARA Akio 核融合科学研究所, ヘリカル研究部, 教授 (20187058)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥10,790,000 (Direct Cost: ¥8,300,000、Indirect Cost: ¥2,490,000); Fiscal Year 2017: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2016: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000); Fiscal Year 2015: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
• Keywords: 真空排気 / 核融合炉 / 超音速 / クライオポンプ / 拡散ポンプ

Outline of Final Research Achievements

The Supersonic Jet Pump (SJP) is an innovative vacuum pump that has a possibility of simultaneous and continuous evacuation of hydrogen isotopes and helium gasses at a high exhaust speed. In the SJP, the exhaust gasses are blown as the supersonic jet from the Blowing Units (BUs) to the Cold Core Rod (CCR) cooled down to ~10 K. Gasses become frozen on the surface of the CCR. The Rotating Cutter (RC) shaves off the frozen gasses to the bottom, where the shaved frozen gasses become sublimated and are evacuated by a roughing pump. A part of the sublimated gasses is introduced to the BUs and blown to the CCR again.
The proof-of-principle experiment of the SJP has been performed. The experimental results show that (i) the exhaust speed of the SJP is 0.3 - 0.5 m3/s (air), that is comparable to that of a large TMP, (ii) this exhaust speed is sustained after 100,000 seconds of pumping with 5 - 7 sccm of air supply, and (iii) the hydrogen gas component largely increases when the RC is rotated.

Research Products

• [Journal Article] Cartridge-Type Helical Blankets Aiming at Easy Construction and Maintenance for the FFHR-d1 (2017)
  • Author(s): Junichi MIYAZAWA, Hitoshi TAMURA, Teruya TANAKA, Takanori MURASE, Takuya GOTO, Nagato YANAGI, Ryuichi SAKAMOTO, Akio SAGARA and the FFHR Design Group
  • Journal Title: Plasma and Fusion Research Volume: 12 Issue: 0 Pages: 1405017-1405017
  • DOI: 10.1585/pfr.12.1405017
  • NAID: 130006897726
  • ISSN: 1880-6821
  • Peer Reviewed / Open Access
• [Journal Article] Conceptual design of a liquid metal limiter/divertor system for the FFHR-d1 (2017)
  • Author(s): J. Miyazawa, T. Goto, T. Murase, T. Ohgo, N. Yanagi, H. Tanaka, H. Tamura,T. Tanaka, S. Masuzaki, R. Sakamoto, J. Yagi, A. Sagara, the FFHR Design Group
  • Journal Title: Fusion Engineering and Design Volume: 125 Pages: 227-238
  • DOI: 10.1016/j.fusengdes.2017.07.003
  • NAID: 120007126283
  • Peer Reviewed
• [Presentation] Initial Results of the Vacuum Pumping Experiment using the Supersonic Jet Pump (2017)
  • Author(s): Junichi Miyazawa, Takuya Goto, Takeru Ohgo
  • Organizer: Joint Meeting of 26th International Toki Conference and 11th Asia Plasma and Fusion Association Conference
  • Int'l Joint Research
• [Presentation] Maintainability of the Helical Reactor FFHR Equipped with the Liquid Metal Divertor (2017)
  • Author(s): Junichi Miyazawa, Takuya Goto, Takeru Ohgo, Tananori Murase, Hitoshi Tamura, Teruya Tanaka, Nagato Yanagi, Ryuichi Sakamoto, Suguru Masuzaki, Akio Sagara, and the FFHR Design Group
  • Organizer: 第13回 International Symposium on Fusion Nuclear Technology (ISFNT-13)
  • Int'l Joint Research / Invited
• [Presentation] Conceptual Design of a Compact Helical Fusion Reactor FFHR-c1 Equipped with Challenging Options (2017)
  • Author(s): Junichi Miyazawa, Takuya Goto, Hitoshi Tamura, Teruya Tanaka, Nagato Yanagi, Yoshiro Terazaki, Takanori Murase, Ryuichi Sakamoto, Akio Sagara and the FFHR Design Group
  • Organizer: Plasma Conference 2017 (PLASMA2017)
• [Presentation] ヘリカル核融合炉FFHR-d1における製作及び保守を容易にする新方式カートリッジ型ヘリカルブランケットCARDISTRY-B (2016)
  • Author(s): 宮澤順一, 村瀬尊則, 田村仁, 田中照也, 後藤拓也, 柳長門, 坂本隆一, 相良明男, FFHR設計グループ
  • Organizer: 第33回プラズマ・核融合学会年会
  • Place of Presentation: 東北大学青葉山キャンパス
  • Year and Date: 2016-11-29
• [Presentation] Physics Basis and Prospect for a Heliotron DEMO (2016)
  • Author(s): J. Miyazawa
  • Organizer: 4th IAEA DEMO Programme Workshop
  • Place of Presentation: Karlsruhe Institute of Technology, Germany
  • Year and Date: 2016-11-15
  • Int'l Joint Research
• [Presentation] REVOLVER-D: A New Liquid Metal Divertor System Consisting of Molten Tin Shower Jets (2016)
  • Author(s): J. Miyazawa, T. Goto, T. Ohgo, N. Yanagi, T. Murase, H. Tamura, H. Tanaka, T. Tanaka, R. Sakamoto, S. Masuzaki, A. Sagara, and the FFHR Design Group
  • Organizer: 26th IAEA Fusion Energy Conference
  • Place of Presentation: Kyoto International Conference Center, Kyoto, Japan
  • Year and Date: 2016-10-17
  • Int'l Joint Research
• [Presentation] 液体金属ダイバータの新概念：REVOLVER-D（炉志向実効的体積熱吸収型鉛直ダイバータ） (2015)
  • Author(s): 宮澤順一，後藤拓也，大胡武，柳長門，村瀬尊則，田村仁，相良明男，FFHR設計グループ
  • 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・豊田講堂
  • Year and Date: 2015-11-24
• [Presentation] Conceptual design of a new liquid metal divertor REVOLVER-D (2015)
  • Author(s): J. Miyazawa, T. Goto, T. Ohgo, N. Yanagi, T. Murase, H. Tamura, A. Sagara, and the FFHR Design Group
  • Organizer: 25th International Toki Conference (ITC-25)
  • Place of Presentation: Ceratopia Toki, Toki, Gifu, Japan
  • Year and Date: 2015-11-03
  • Int'l Joint Research
• [Presentation] Liquid Metal Divertor Concept Consisting of Vertical Free-Surface Streams and a Supersonic Jet Pump (2015)
  • Author(s): J. Miyazawa, T. Goto, T. Murase, J. Yagi, H. Tamura, N. Yanagi, T. Tanaka, R. Sakamoto, S. Masuzaki, A. Sagara, and the FFHR Design Group
  • Organizer: First IAEA Technical Meeting on Divertor Concepts
  • Place of Presentation: IAEA Headquarters, Vienna International Center, Vienna, Austria
  • Year and Date: 2015-09-29
  • Int'l Joint Research
• [Patent(Industrial Property Rights)] クライオポンプ (2015)
  • Inventor(s): 宮澤順一
  • Industrial Property Rights Holder: 自然科学研究機構
  • Industrial Property Rights Type: 特許
  • Filing Date: 2015-06-03