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Next Generation Fusion Reactor Design: Existence and Symmetry of Magnetofluidostatic Equilibria in Bounded Domains

Research Project

Project/Area Number 21K13851
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 13010:Mathematical physics and fundamental theory of condensed matter physics-related
Research InstitutionNational Institute for Fusion Science (2023)
The University of Tokyo (2021-2022)

Principal Investigator

Sato Naoki  核融合科学研究所, 研究部, 准教授 (60872893)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
KeywordsMagnetohydrodynamics / Grad's conjecture / Stellarator / Elliptic-Hyperbolic PDE / Quasisymmetry / Drift wave turbulence / Self-organization / Collisionless relaxation / Hamiltonian Mechanics / Nambu Mechanics / Statistical Mechanics / Self-Organization / Topological Constraint / Grad conjecture / Hasegawa-Mima equation / Vorticity / Pair plasmas / 理想電磁流体 / 楕円双曲型偏微分方程式 / 対称性 / ステラレータ / 核融合
Outline of Research at the Start

次世代核融合炉の設計においては炉形の選択が一つの重要な要素であり、適切な炉形を選択するためにはまず、理論上実現可能な炉形を正しく理解する必要がある。炉形の実現可否は炉内プラズマ支配方程式の平衡解の存在有無により決定されるが、この方程式は楕円双曲型であり対称性を持たない系での解析方法が確立しておらず平衡解の存在は知られていない。そこで、本研究ではa)幾何学的手法による、炉内プラズマ支配方程式の対称性を持たない解析解の構築、b)実現可能な炉形条件の導出を行っていく。これにより、楕円双曲型方程式の解析方法の解明、次世代核融合炉の炉形の提案が可能になる。

Outline of Final Research Achievements

This study has achieved the following research results on the development of next-generation nuclear fusion reactors: (1) Proof of the existence of asymmetric solutions to the anisotropic pressure MHD equilibrium equations that determine the equilibrium magnetic field in a next-generation nuclear fusion reactor. (2) Proof of the existence of quasi-symmetric equilibrium magnetic fields. (3) Development and analysis of equations describing electromagnetic turbulence around equilibrium solutions. (4) Construction of an effective collision operator to describe self-organization phenomena and collisionless relaxation processes in fusion plasmas, astrophysical plasmas, and gravitational many-body systems.

Academic Significance and Societal Importance of the Research Achievements

近年、核融合発電は持続可能なエネルギー源として注目されており、社会のエネルギー問題解決への期待が高まっている。次世代核融合炉の設計において、炉形の実現可能性は、炉内プラズマを支配する方程式(理想電磁流体方程式)の平衡解の存在に大きく依存する。しかし、優れた閉じ込め性能が期待される非対称な炉形の平衡解の存在については、これまで証明されていない。
本研究では、非等方圧力理想電磁流体平衡方程式において、ユークリッド空間の連続対称性を持たない平衡磁場の存在を証明した。これは、偏微分方程式の数学的理論の発展に貢献するだけでなく、次世代核融合炉の設計指針となる重要な成果である。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (41 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (2 results) Journal Article (13 results) (of which Int'l Joint Research: 1 results,  Open Access: 12 results,  Peer Reviewed: 11 results) Presentation (16 results) (of which Int'l Joint Research: 8 results,  Invited: 12 results) Remarks (9 results) Funded Workshop (1 results)

  • [Int'l Joint Research] The University of Texas at Austin(米国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] The Australian National University/The University of Western Australia(オーストラリア)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Correction to ‘Generalization of Hamiltonian mechanics to a three-dimensional phase space2024

    • Author(s)
      Naoki Sato
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2024 Issue: 4 Pages: 049201-049201

    • DOI

      10.1093/ptep/ptae036

    • Related Report
      2023 Annual Research Report
    • Open Access
  • [Journal Article] An extended Hasegawa?Mima equation for nonlinear drift wave turbulence in general magnetic configurations2024

    • Author(s)
      Sato Naoki、Yamada Michio
    • Journal Title

      Physica D: Nonlinear Phenomena

      Volume: 459 Pages: 134031-134031

    • DOI

      10.1016/j.physd.2023.134031

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Nested invariant tori foliating a vector field and its curl: Toward MHD equilibria and steady Euler flows in toroidal domains without continuous Euclidean isometries2023

    • Author(s)
      Sato Naoki、Yamada Michio
    • Journal Title

      Journal of Mathematical Physics

      Volume: 64 Issue: 8

    • DOI

      10.1063/5.0151955

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] 2次元回転系上の乱流における大規模構造形成:プラズマ物理と地球流体力学2023

    • Author(s)
      佐藤直木、山田道夫
    • Journal Title

      プラズマ核融合学会誌

      Volume: 99 (5) Pages: 183-186

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Maximum entropy states of collisionless positron-electron plasma in a dipole magnetic field2023

    • Author(s)
      Sato Naoki
    • Journal Title

      Physics of Plasmas

      Volume: 30 Issue: 4 Pages: 042503-042503

    • DOI

      10.1063/5.0135659

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Vorticity equation on surfaces with arbitrary topology embedded in three-dimensional Euclidean space2022

    • Author(s)
      Sato Naoki、Yamada Michio
    • Journal Title

      Journal of Mathematical Physics

      Volume: 63 Issue: 9 Pages: 093101-093101

    • DOI

      10.1063/5.0080453

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] A generalized Hasegawa?Mima equation in curved magnetic fields2022

    • Author(s)
      Sato Naoki、Yamada Michio
    • Journal Title

      Journal of Plasma Physics

      Volume: 88 Issue: 3 Pages: 1-19

    • DOI

      10.1017/s0022377822000514

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Existence of weakly quasisymmetric magnetic fields without rotational transform in asymmetric toroidal domains2022

    • Author(s)
      Sato Naoki
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1 Pages: 1-10

    • DOI

      10.1038/s41598-022-15594-9

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] PDEの分類、ユークリッド空間の連続対称性と理想流体平衡の存在問題2022

    • Author(s)
      佐藤直木
    • Journal Title

      ながれ

      Volume: 41 Pages: 336-341

    • Related Report
      2022 Research-status Report
    • Open Access
  • [Journal Article] Inward diffusion driven by low frequency fluctuations in self-organizing magnetospheric plasma2022

    • Author(s)
      Kenmochi N.、Yokota Y.、Nishiura M.、Saitoh H.、Sato N.、Nakamura K.、Mori T.、Ueda K.、Yoshida Z.
    • Journal Title

      Nuclear Fusion

      Volume: 62 Issue: 2 Pages: 026041-026041

    • DOI

      10.1088/1741-4326/ac412c

    • NAID

      120007183005

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Quasisymmetric magnetic fields in asymmetric toroidal domains2021

    • Author(s)
      Sato Naoki、Qu Zhisong、Pfefferle David、Dewar Robert L.
    • Journal Title

      Physics of Plasmas

      Volume: 28 Issue: 11 Pages: 112507-112507

    • DOI

      10.1063/5.0065633

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The effect of spacetime curvature on statistical distributions2021

    • Author(s)
      Sato Naoki
    • Journal Title

      Classical and Quantum Gravity

      Volume: 38 Issue: 16 Pages: 165003-165003

    • DOI

      10.1088/1361-6382/ac11a9

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Generalization of Hamiltonian mechanics to a three-dimensional phase space2021

    • Author(s)
      Sato Naoki
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 2021 Issue: 6 Pages: 1-18

    • DOI

      10.1093/ptep/ptab066

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] A Reduced Ideal MHD System for Nonlinear Magnetic Field Turbulence in Plasmas with Approximate Flux Surfaces2023

    • Author(s)
      Naoki Sato、Michio Yamada
    • Organizer
      The Grad conjecture in Fluid Mechanics and Magnetohydrodynamics: Theory and Applications
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] On the Landau Collision Operator in Noncanonical Phase Space and the resulting modification of the moment equations governing fluid dynamics2023

    • Author(s)
      Naoki Sato、Philip J. Morrison
    • Organizer
      Fluids in Seoul 2024, June E Huh Center for Mathematical Challenges (HCMC)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Magnetohydrostatics2023

    • Author(s)
      Naoki Sato
    • Organizer
      Simons Hidden Symmetries and Fusion Energy Collaboration Australian Retreat
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] On the Grad conjecture in anisotropic MHD2023

    • Author(s)
      Naoki Sato、Michio Yamada
    • Organizer
      AAPPS-DPP 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Guiding Center Derivation, Hamiltonian Structure, and Nonlinear Stability of Steady Solutions of the Generalized Hasegawa-Mima Equation for Drift Wave Turbulence in Curved Magnetic Fields2023

    • Author(s)
      Naoki Sato、Michio Yamada
    • Organizer
      日本物理学会第78回年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 自己組織化・乱流輸送現象の数理2023

    • Author(s)
      佐藤直木
    • Organizer
      メタ階層ダイナミクス研究会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Nested invariant tori foliating a vector field and its curl: toward MHD equilibria in toroidal domains wihout Euclidean isometries2022

    • Author(s)
      Naoki Sato
    • Organizer
      Variational Principles of Plasma Confinement in 3D Magnetic Fields, Mathematical Sciences Institute, Australian National University, Canberra, Australia, 2 Febraury 2023
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Nested invariant tori foliating a vector field and its curl: toward steady Euler flows in toroidal domains without Euclidean isometries2022

    • Author(s)
      Naoki Sato
    • Organizer
      The 8th KTGU Workshop for Young Researchers, Kyoto University, Kyoto, Japan, 30 January 2023
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Existence of weakly quasisymmetric magnetic fields in asymmetric toroidal domains with non-tangential quasisymmetry2022

    • Author(s)
      Naoki Sato
    • Organizer
      AAPPS-DPP 2022, F-I4, 10 October 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Quasisymmetric magnetic fields in asymmetric toroidal domains2021

    • Author(s)
      N. Sato, Z. Qu, D. Pfefferle, and R. L. Dewar
    • Organizer
      Simons hour talks, Simons collaboration on hidden symmetries and fusion energy
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Existence of ideal magnetofluidostatic equilibria with non-constant pressure in asymmetric domains,2021

    • Author(s)
      N. Sato
    • Organizer
      F-I56, AAPPS-DPP 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Quasisymmetric equilibria in anisotropic magnetohydrodynamics2021

    • Author(s)
      N. Sato
    • Organizer
      BO08.00015, APS-DPP 2021
    • Related Report
      2021 Research-status Report
  • [Presentation] Generalization of Hamiltonian mechanics to a 3-dimensional phase space2021

    • Author(s)
      N. Sato
    • Organizer
      Workshop on geometry of foliations and its applications
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Hamiltonian mechanics, Nambu mechanics, and generalized phase space2021

    • Author(s)
      N. Sato
    • Organizer
      3rd Toyama International Symposium on "Physics at the Cosmic Frontier" (PCF2021)
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] A Generalized Hasegawa-Mima Equation in Curved Magnetic Fields2021

    • Author(s)
      N. Sato and M. Yamada
    • Organizer
      Phil Morrison's Friday Meetings
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Hasegawa-Mima equation in magnetic fields with arbitrary topology2021

    • Author(s)
      N. Sato and M. Yamada
    • Organizer
      16pGA41-8, JPS 2022 spring meeting
    • Related Report
      2021 Research-status Report
  • [Remarks] Google Scholar

    • URL

      https://scholar.google.com/citations?user=VOI6Ej0AAAAJ&hl=en

    • Related Report
      2023 Annual Research Report
  • [Remarks] Researchmap

    • URL

      https://researchmap.jp/naoki_sato

    • Related Report
      2023 Annual Research Report
  • [Remarks] ホームページ

    • URL

      https://naokisato.work/

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
  • [Remarks] 2024年3月に開催した国際ワークショップのホームページ

    • URL

      https://sites.google.com/view/grad-conjecture/home?authuser=0

    • Related Report
      2023 Annual Research Report
  • [Remarks] 関連する共同利用・共同研究拠点(下記備考参照)

    • URL

      https://www.omu.ac.jp/orp/ocami-en/joint/projects/

    • Related Report
      2023 Annual Research Report
  • [Remarks] google scholar

    • URL

      https://scholar.google.com/citations?user=VOI6Ej0AAAAJ&hl=en

    • Related Report
      2022 Research-status Report
  • [Remarks] researchmap

    • URL

      https://researchmap.jp/naoki_sato

    • Related Report
      2022 Research-status Report
  • [Remarks] ホームページ

    • URL

      https://naokisato.work

    • Related Report
      2021 Research-status Report
  • [Remarks] 研究室ホームページ

    • URL

      http://www.ppl.k.u-tokyo.ac.jp/publication.html

    • Related Report
      2021 Research-status Report
  • [Funded Workshop] The Grad Conjecture in fluid mechanics and magnetohydrodynamics: theory and applications2023

    • Related Report
      2023 Annual Research Report

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Published: 2021-04-28   Modified: 2025-01-30  

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