Impact of ion heating such as alpha particle channeling on fusion reactor design space

• Project/Area Number: 17K07002
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Nuclear fusion studies
• Research Institution: Tohoku University (2020); National Institutes for Quantum and Radiological Science and Technology (2017-2019)
• Principal Investigator: Tobita Kenji 東北大学, 工学研究科, 教授 (50354569)
• Co-Investigator(Kenkyū-buntansha): 高橋 宏幸 東北大学, 工学研究科, 助教 (30768982)
• Project Period (FY): 2017-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 核融合炉 / システム設計 / アルファ粒子 / イオン加熱 / チャネリング / イオン温度 / 電子加熱 / 電子温度

Outline of Final Research Achievements

In the plasma condition with ion temperature higher than electron temperature, which could be realized as a result of alpha channeling, the operation space (plasma temperature and density space) and the design space (plasma major radius and minor radius space) of fusion reactor were investigated on the basis of fusion reactor system analysis. It was concluded that, in such a higher ion temperature condition, the design space is expanded, especially in a compact reactor regime, as a result of reduced plasma requirements such as energy confinement time.

Academic Significance and Societal Importance of the Research Achievements

本研究の目的は、将来的に構想しうる核融合技術を核融合炉設計の立場からバックキャストしてその開発の価値を再定義することにある。アルファ粒子のチャネリングは、プラズマ制御概念としては黎明段階に留まっているが、この技術が発展してプラズマ制御に活用できるようになればこれまでにないコンパクトで魅力的な核融合炉を構想しうることを示したもので、核融合エネルギーの将来的潜在力を示す成果といえる。

Research Products

• [Journal Article] Japan’s efforts to develop the concept of JA DEMO during the past decade (2019)
  • Author(s): K. Tobita, R. Hiwatari, Y. Sakamoto, Y. Someya, N. Asakura, H. Utoh, Y. Miyoshi, S. Tokunaga, Y. Honma, S. Kakudate, N. Nakajima, The Joint Special Design Team for Fusion DEMO
  • Journal Title: Fusion Science and Technology Volume: 印刷中 Issue: 5 Pages: 372-383
  • DOI: 10.1080/15361055.2019.1600931
  • NAID: 120006712769
  • Peer Reviewed / Open Access
• [Journal Article] Conceptual design of Japan’s fusion DEMO reactor (JA DEMO) and superconducting coil issues (2019)
  • Author(s): Tobita K.、Utoh H.、Hiwatari R.、Miyoshi Y.、Tokunaga S.、Sakamoto Y.、Someya Y.、Asakura N.、Homma Y.、Nakajima N.、The Joint Special Design Team for Fusion DEMO
  • Journal Title: Journal of Physics: Conference Series Volume: 1293 Issue: 1 Pages: 012078-012078
  • DOI: 10.1088/1742-6596/1293/1/012078
  • Peer Reviewed
• [Journal Article] Conceptual design of Japan’s fusion DEMO reactor (JA DEMO) and superconducting coil issues (2019)
  • Author(s): K. Tobita, H. Utoh, R. Hiwatari, Y. Miyoshi, S. Tokunaga, Y. Sakamto, Y. Someya, N. Asakura, Y. Homma, N. Nakajima, The Joint Special Design Team for Fusion DEMO
  • Journal Title: Journal of Physics: Conference Series Volume: 掲載決定
  • Peer Reviewed
• [Journal Article] Overview of the DEMO conceptual design activity in Japan (2018)
  • Author(s): Tobita Kenji、Hiwatari Ryoji、Utoh Hiroyasu、Miyoshi Yuya、Asakura Nobuyuki、Sakamoto Yoshiteru、Someya Youji、Homma Yuki、Nakamura Makoto、Hoshino Kazuo、Tanigawa Hiroyasu、Nakamichi Masaru、Tokunaga Shinsuke、Kudo Hironobu、Nishimura Arata
  • Journal Title: Fusion Engineering and Design Volume: 136 Pages: 1024-1031
  • DOI: 10.1016/j.fusengdes.2018.04.059
  • Peer Reviewed
• [Presentation] 原型炉における電子サイクロトロン電流駆動効率の入射パワー依存性 (2021)
  • Author(s): 清野智大、高橋幸宏、福山淳、岡本敦、北島純男、飛田健次
  • Organizer: 日本物理学会年会
• [Presentation] 核融合原型炉における電子サイクロトロン波電流駆動の効率改善に向けた研究 (2020)
  • Author(s): 清野智大、飛田健次、高橋宏幸、福山淳、長﨑百伸、出射浩、坂本宜照、P. Boonyarittipong、坂田裕紀、草開薫、M.N. Winarto、吉村渓 冴、岡本敦、北島純男
  • Organizer: 第13回核融合エネルギー連合講演会
• [Presentation] 核融合原型炉における電子サイクロトロン波電流駆動の効率改善に向けた研究 (2020)
  • Author(s): 清野智大、飛田健次、高橋宏幸、福山淳、長﨑百伸、出射浩、坂本宜照、P. Boonyarittipong、坂田裕紀、草開薫、M.N. Winarto、吉村渓冴、岡本敦、北島純男
  • Organizer: 第13回核融合エネルギー連合講演会
• [Presentation] Japan's efforts to develop DEMO concept during the past decade (2018)
  • Author(s): K. Tobita, R. Hiwatari, Y.Sakamoto, Y. Someya, N. Asakura, H. Utoh, Y. Miyoshi, S. Tokunaga, Y. Homma, N. Nakajima, S. Kakudate, The Joint Special Design Team for Fusion DEMO
  • Organizer: The 23rd Topical Meeting on the Technology of Fusion Energy (TOFE), Orlando, U.S.A.
  • Int'l Joint Research / Invited
• [Presentation] Conceptual design of Japan’s fusion DEMO reactor (JA DEMO) with emphasis on superconducting magnet issues (2018)
  • Author(s): K. Tobita, H. Utoh, R. Hiwatari, Y. Miyoshi, S. Tokunaga, Y. Sakamoto, Y. Someya, N. Asakura, Y. Homma, N. Nakajima, The Joint Special Design Team for Fusion DEMO
  • Organizer: The 31st International Symposium on Superconductivity (ISS2018), Tsukuba, Japan
  • Int'l Joint Research / Invited