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Development of an ambient magnetic field compensation system in an accelerator facility for the neutron electric dipole moment measurement

Research Project

Project/Area Number 20K14487
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionOsaka University

Principal Investigator

Higuchi Takashi  大阪大学, 核物理研究センター, 招へい准教授 (90843772)

Project Period (FY) 2020-04-01 – 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 2022: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords電気双極子モーメント / 加速器 / 磁場安定化 / 時間反転対称性 / CP対称性の破れ / 超冷中性子 / 中性子 / 磁気シールド / 素粒子実験 / 磁場安定性 / CP対称性 / 素粒子物理学 / 基本的対称性
Outline of Research at the Start

TRIUMF研究所での中性子の電気双極子モーメント(EDM)探索実験のために不可欠な実験要素の開発を行う。
目標とする精度での中性子EDM測定には、実験装置内の極めて高い磁場の安定性を要するが、実験は強い背景磁場や磁場の変動が存在する加速器施設内で行われる。本研究ではこのような加速器施設内の環境磁場を適切なコイルの組み合せによって打ち消す補償システムを開発する。このシステムに、4層の磁気シールドと共存磁力計を組み合わせることで、目標とする磁場の安定度を達成できる見込みである。測定により得られた磁場の特徴に基づき、数値計算と有限要素法によるシミュレーションを用いて適切なコイルの設計と製作を行う。

Outline of Final Research Achievements

In this project, an environmental magnetic field compensation system was developed for the TUCAN neutron EDM experiment. To achieve the magnetic field environment required for the experiment, a high performance magnetically shielded room (MSR) was developed. However, a background magnetic field of several hundred uT exists at the experiment site due to leakage from the cyclotron accelerator, and there was concern about its negative impact on the MSR shielding performance. In this context, we developed the ambient magnetic field compensation system. First, we obtained a three-dimensional magnetic field distribution from a measurement prior to the construction of the MSR. Based on this data, a simulation was developed that implemented the ambient magnetic field, the MSR, and the compensation coils. The system was designed to reduce the in-plane magnetic flux density in the outermost layer of the MSR by half. A test assembly of the system was completed and a charging test was performed.

Academic Significance and Societal Importance of the Research Achievements

本研究で扱ったような磁気シールドルーム(MSR)は、代表的なものではベルリンPTBのBMSR-2など医療イメージングなどの応用のために、世界の数か所で共用施設として利用されているが、本研究のような加速器からの強い漏れ磁場が存在する場所に設置される例は過去にない。その意味で、本研究は、加速器施設内へのMSR導入の一つのモデルケースを提示した。これは将来の幅広い分野へのMSRの応用のために有意義な知見を与えると考えている。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (52 results)

All 2024 2023 2022 2021 2020 Other

All Int'l Joint Research (6 results) Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (38 results) (of which Int'l Joint Research: 22 results,  Invited: 4 results) Remarks (5 results)

  • [Int'l Joint Research] TRIUMF/The University of Winnipeg/The University of British Columbia(カナダ)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Oak Ridge National Laboratory/North Carolina State University(米国)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] TRIUMF/The University of Winnipeg/The University of Manitoba(カナダ)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] NC State Uninversity(米国)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] TRIUMF/The University of Winnipeg/The University of Manitoba(カナダ)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] TRIUMF/The University of Winnipeg/The University of Manitoba(カナダ)

    • Related Report
      2020 Research-status Report
  • [Journal Article] The TUCAN Neutron Electric Dipole Moment Experiment2022

    • Author(s)
      Mark McCrea、TUCAN Collaboration
    • Journal Title

      Proceedings of Science

      Volume: PANIC2021 Pages: 459-459

    • DOI

      10.22323/1.380.0459

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The Precision nEDM Measurement with UltraCold Neutrons at TRIUMF2022

    • Author(s)
      Ryohei Matsumiya et al.
    • Journal Title

      JPS Conference Proceedings

      Volume: 37 Pages: 020701-020701

    • DOI

      10.7566/jpscp.37.020701

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Prospects for a neutron EDM measurement with an advanced ultracold neutron source at TRIUMF2022

    • Author(s)
      Higuchi Takashi、on behalf of the TUCAN collaboration
    • Journal Title

      EPJ Web of Conferences

      Volume: 262 Pages: 01015-01015

    • DOI

      10.1051/epjconf/202226201015

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 原子炉で行う中性子電気双極子モーメントの探索2024

    • Author(s)
      川崎真介
    • Organizer
      第3回研究用原子炉を用いた原子核素粒子物理(FPUR-III)
    • Related Report
      2023 Annual Research Report
  • [Presentation] 低エネルギー系精密測定による素粒子標準模型の検証2024

    • Author(s)
      樋口嵩
    • Organizer
      京都大学複合原子力科学研究所 第58回学術講演会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Progress of a Neutron Electric Dipole Search by the TUCAN collaboration2024

    • Author(s)
      Shinsuke Kawasaki
    • Organizer
      The 15th International Workshop on Fundamental Physics Using Atoms (FPUA2024)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] TUCAN中性子電気双極子モーメント測定実験の最新の開発状況について2024

    • Author(s)
      松宮亮平
    • Organizer
      日本物理学会2024年春季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Progress and Goals of the TRIUMF nEDM Measurement2023

    • Author(s)
      Derek Fujimoto
    • Organizer
      New physics searches at the precision frontier (INT-23-1b)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] TRIUMFの超冷中性子源と中性子電気双極子モーメント測定装置の開発”2023

    • Author(s)
      樋口 嵩
    • Organizer
      日本中性子科学会第23回年会
    • Related Report
      2023 Annual Research Report
  • [Presentation] UCANによる中性子電気双極子モーメント探索 II2023

    • Author(s)
      川崎真介
    • Organizer
      日本物理学会第78回年次大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Fundamental Physics with Slow Neutrons2023

    • Author(s)
      Shinsuke Kawasaki
    • Organizer
      KEK IPNS workshop Fundamental Neutron Physics
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] New Physics Search in TUCAN2023

    • Author(s)
      Takashi Higuchi
    • Organizer
      KEK IPNS workshop Fundamental Neutron Physics
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Overview and Status of the TUCAN EDM Experiment2023

    • Author(s)
      Derek Fujimoto
    • Organizer
      The 5th Workshop on Searches for a Neutron Electric Dipole Moment (nEDM2023)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Magnetically Shielded Room for the Neutron Electric Dipole Moment Experiment at TRIUMF2023

    • Author(s)
      Maedeh Lavvaf
    • Organizer
      The 5th Workshop on Searches for a Neutron Electric Dipole Moment (nEDM2023)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Current Status of the TUCAN UCN Source and neutron EDM Measurement2023

    • Author(s)
      Eric Miller
    • Organizer
      6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan (HAW23)
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] An Introduction to the TUCAN EDM Measurement2023

    • Author(s)
      Derek Fujimoto
    • Organizer
      60th Winter Nuclear Particle Physics Conference (WNPPC20)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Status and Prospects of the TUCAN EDM experiment2023

    • Author(s)
      Masaaki Kitaguchi
    • Organizer
      KMI Workshop Searches of Electric Dipole Moment -- From Theory to Experiments
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] TUCANによる中性子電気双極子モーメント探索実験2023

    • Author(s)
      川崎 真介
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] 高強度超冷中性子源による中性子EDM探索にむけて2022

    • Author(s)
      樋口 嵩
    • Organizer
      RCNP研究会 研究用原子炉を 用い た 原子核素粒子物理学
    • Related Report
      2022 Research-status Report
  • [Presentation] The TRIUMF UltraCold Advanced Neutron source and EDM experiment2022

    • Author(s)
      Wolfgang Schreyer
    • Organizer
      APS April Meeting 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] The cyclotron based high-yield ultracold neutron source and neutron electric dipole moment experiment2022

    • Author(s)
      Ruediger Picker
    • Organizer
      2022 CAP congress
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Magnetic Holding Field Requirements for UCN Precession in the TUCAN EDM Experiment2022

    • Author(s)
      Mark McCrea
    • Organizer
      2022 CAP congress
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Mapping the Magnetically Shielded Room for the Neutron Electric Dipole Moment Experiment at TRIUMF2022

    • Author(s)
      Maedeh Lavvaf
    • Organizer
      2022 CAP congress
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 高強度超冷中性子源による中性子電気双極子モーメントの探索2022

    • Author(s)
      赤塚 浩明
    • Organizer
      RCNP研究会 中性子と原子で探る基礎物理
    • Related Report
      2022 Research-status Report
  • [Presentation] The TRIUMF UltraCold Advanced Neutron source and EDM experiment2022

    • Author(s)
      Wolfgang Schreyer, Russell Mammei
    • Organizer
      14th Conference on the Interactions of Particle and Nuclear Physics (CIPNP2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Magnetics for the TUCAN EDM experiment2022

    • Author(s)
      Russell Mammei
    • Organizer
      14th Conference on the Interactions of Particle and Nuclear Physics (CIPNP2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Progress towards the TRIUMF ultracold neutron facility and neutron electric dipole moment experiment2022

    • Author(s)
      Ruediger Picker
    • Organizer
      8th International Symposium on Symmetries in Subatomic Physics (SSP2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Neutron Electric Dipole Measurement by TUCAN2022

    • Author(s)
      Shinsuke Kawasaki
    • Organizer
      J-PARC Workshop "Progress for Fundamental Physics with Neutrons"
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Towards a neutron electric dipole moment measurement with an advanced ultracold neutron source at TRIUMF2022

    • Author(s)
      Takashi Higuchi
    • Organizer
      Physics of Fundamental Symmetries and Interactions (PSI2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Progress towards a neutron electric dipole moment measurement with an advanced ultracold neutron source at TRIUMF2022

    • Author(s)
      Takashi Higuchi
    • Organizer
      AEC Experimental Seminar
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Precision nEDM experiment at TRIUMF2022

    • Author(s)
      Kicjihi Hatanaka
    • Organizer
      The 14th International Workshop on Fundamental Physics Using Atoms (FPUA2022)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 中性子電気双極子モーメント探索TUCAN実験に向けた装置開発2022

    • Author(s)
      今城 想平
    • Organizer
      KEK S型課題 合同研究会
    • Related Report
      2022 Research-status Report
  • [Presentation] TUCANプロジェクト 高強度超冷中性子源による中性子電気双極子モーメントの探索2022

    • Author(s)
      赤塚 浩明
    • Organizer
      KEK S型課題 合同研究会
    • Related Report
      2022 Research-status Report
  • [Presentation] 中性子EDM測定によるCP対称性の破れの探索2021

    • Author(s)
      樋口嵩
    • Organizer
      RCNPでの次期計画検討会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Prospects towards a neutron EDM measurement with an advanced ultracold neutron source at TRIUMF2021

    • Author(s)
      Takashi Higuchi, the TUCAN collaboration
    • Organizer
      International Conference on Exotic Atoms and Related Topics (EXA 2021)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Recherche du moment dipolaire electrique du neutron avec une source intense de neutrons ultra-froids2021

    • Author(s)
      Takashi Higuchi, La collaboration TUCAN
    • Organizer
      Les 6es Rencontres des chercheurs francophones du Kansai (RCFK2021)
    • Related Report
      2021 Research-status Report
  • [Presentation] Prospects towards a neutron EDM measurement with an advanced ultracold neutron source at TRIUMF2021

    • Author(s)
      Takashi Higuchi, the TUCAN collaboration
    • Organizer
      International Workshop on Searches for a Neutron Electric Dipole Moment (nEDM2021)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] TRIUMFにおける中性子EDM測定のための磁場関連実験要素の開発状況2021

    • Author(s)
      樋口嵩, TUCAN collaboration
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 中性子EDM測定のための加速器施設内の環境磁場補償システムの開発2020

    • Author(s)
      樋口嵩, TUCAN collaboration
    • Organizer
      日本物理学会第75回年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 中性子EDM実験のための磁場関連実験要素の開発2020

    • Author(s)
      樋口嵩, TUCAN collaboration
    • Organizer
      日本物理学会2020年秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] Towards a neutron electric dipole moment measurement with an advanced ultracold neutron source at TRIUMF2020

    • Author(s)
      Takashi Higuchi, the TUCAN collaboration
    • Organizer
      原子衝突学会 第45回年会
    • Related Report
      2020 Research-status Report
  • [Remarks] The UCN group, TRIUMF

    • URL

      https://www.triumf.ca/ucn

    • Related Report
      2023 Annual Research Report
  • [Remarks] Nuclear Physics Group, The University of Winnipeg

    • URL

      http://nuclear.uwinnipeg.ca/

    • Related Report
      2023 Annual Research Report
  • [Remarks] The UCN group

    • URL

      https://www.triumf.ca/node/39465

    • Related Report
      2022 Research-status Report
  • [Remarks] Experimental Subatomic Physics

    • URL

      http://nuclear.uwinnipeg.ca/

    • Related Report
      2022 Research-status Report
  • [Remarks] TRIUMF UCN home

    • URL

      https://www.triumf.ca/ucn

    • Related Report
      2021 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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