• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Investigation on superconducting property and development for materials for high-Q and high gradient superconducting accelerating cavity

Research Project

Project/Area Number 19H04402
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 80040:Quantum beam science-related
Research InstitutionHigh Energy Accelerator Research Organization

Principal Investigator

Umemori Kensei  大学共同利用機関法人高エネルギー加速器研究機構, 加速器研究施設, 教授 (60353364)

Co-Investigator(Kenkyū-buntansha) 有沢 俊一  国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, 上席研究員 (00354340)
許斐 太郎  大学共同利用機関法人高エネルギー加速器研究機構, 加速器研究施設, 助教 (20634158)
井藤 隼人  大学共同利用機関法人高エネルギー加速器研究機構, 加速器研究施設, 特任助教 (30881552)
阪井 寛志  大学共同利用機関法人高エネルギー加速器研究機構, 加速器研究施設, 准教授 (50345229)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2021: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2020: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2019: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
Keywords超伝導加速空洞 / 加速器 / 磁束 / 超伝導 / ニオブ / 表面抵抗 / 表面分析 / 磁束観察 / 磁束排除
Outline of Research at the Start

本研究は、超伝導加速空洞の高加速勾配化・高Q値化といった高性能化のための現象解明を進め、新規材料開発を行うものである。
超伝導空洞の材料として一般的にニオブが用いられているが、高性能化の実現のために重要な点は2つある。1つはニオブの表面状態を最適化する事、もう1つは冷却時にニオブ表面に捕捉される磁束を抑制する事である。
走査SQUID顕微鏡、MO測定を用いた磁束捕捉の観測、EBSD・SEM・SIMS・XPS等による表面分析とシミュレーションを用いた磁束捕捉の理解、超伝導空洞を用いた空洞性能の評価の相互の結果から理解を深めながら研究を遂行し、理想的な超伝導状態の実現を目指す。

Outline of Final Research Achievements

We have conducted research in order to realize high-performance (higher accelerating gradient and higher Q value) of niobium superconducting cavities. Realtime measurement of flux trapping during cooldown process has been performed using magneto-optical film. Trapping of magnetic flux to the niobium samples were observed in detail, such as showing the existence of an intermediate mixed state, and its mechanism was more deeply understood. On the other hand, new surface treatment procedure, so called "furnace baking", has been developed. It was showen that the higher gradient and higher Q-value of cavities could be realized by applying an appropriate temperature heat treatment in the furnace.

Academic Significance and Societal Importance of the Research Achievements

電子や陽子、重イオンといった荷電粒子を加速するための超伝導加速空洞の高性能化に向けた研究である。捕捉磁束の低減・制御は、表面抵抗の低減に繋がり、ヘリウム冷凍機の負荷の削減を実現する。冷却時の磁束捕捉の様子をリアルタイムで示すことで、補足メカニズムについての理解を格段に進めた。また、真空炉ベーキングという簡易な手法での空洞性能の高勾配化・高Q値化を実現させた。世界的にも注目されており、今後、ビーム加速を行う超伝導加速器として実際に使われる技術になると考えられる。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (25 results)

All 2022 2021 2020 2019

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 3 results) Presentation (20 results) (of which Int'l Joint Research: 12 results,  Invited: 1 results)

  • [Journal Article] Observation of intermediate mixed state in high-purity cavity-grade Nb by magneto-optical imaging2021

    • Author(s)
      Ooi S.、Tachiki M.、Konomi T.、Kubo T.、Kikuchi A.、Arisawa S.、Ito H.、Umemori K.
    • Journal Title

      Physical Review B

      Volume: 104 Issue: 6 Pages: 064504-064504

    • DOI

      10.1103/physrevb.104.064504

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Influence of Furnace Baking on Q-E Behavior of Superconducting Accelerating Cavities2021

    • Author(s)
      Ito H、Araki H、Takahashi K、Umemori K
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: 071G01 Issue: 7 Pages: 1-8

    • DOI

      10.1093/ptep/ptab056

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Systematic evaluation of magnetic sensitivities of anisotropic magnetoresistive sensors at liquid helium temperature for superconducting cavities2021

    • Author(s)
      Okada T.、Kako E.、Konomi T.、Masuzawa M.、Sakai H.、Tsuchiya K.、Ueki R.、Umemori K.、Pizzol P.、Poudel A.、Tajima T.
    • Journal Title

      Review of Scientific Instruments

      Volume: 92 Issue: 3 Pages: 035003-035003

    • DOI

      10.1063/5.0038805

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Low-Temperature Properties of the Magnetic Sensor with Amorphous Wire2020

    • Author(s)
      He Dongfeng、Umemori Kensei、Ueki Ryuichi、Dohmae Takeshi、Okada Takafumi、Tachiki Minoru、Ooi Shuuichi、Watanabe Makoto
    • Journal Title

      Sensors

      Volume: 20 Issue: 23 Pages: 6986-6986

    • DOI

      10.3390/s20236986

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Study on Magneto-Resistance Sensors for Low Magnetic Field Measurements2020

    • Author(s)
      植木 竜一
    • Journal Title

      IEEE Transactions on Applied Superconductivity

      Volume: 30 Issue: 4 Pages: 1-4

    • DOI

      10.1109/tasc.2020.2976994

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Observation of intermediate mixed state in high-purity cavity grade Nb by MO imaging and its implication to flux trapping mechanism2022

    • Author(s)
      S. Ooi, M. Tachiki, A. Kikuchi, S. Arisawa, T. Konomi, T. Kubo, H. Ito, E. Kako, H. Sakai, K. Umemori
    • Organizer
      TESLA Technology Collaboration (TTC) 2022 meeting
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 磁気光学イメージング法による超高純度ニオブの磁束状態観測2021

    • Author(s)
      大井 修一, 立木 実, 菊池 章弘, 有沢 俊一, 許斐太郎, 井藤隼人, 久保毅幸, 加古永治, 阪井寛志, 梅森健成
    • Organizer
      日本物理学会 2021年秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Magneto-optical imaging of vortex bundles in high purity Nb2021

    • Author(s)
      S. Ooi, M. Tachiki, A. Kikuchi, S. Arisawa, T. Konomi, T. Kubo, H. Ito, E. Kako, H. Sakai, K. Umemori
    • Organizer
      34th International Symposium on Superconductivity (ISS2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 走査SQUID顕微鏡を利用した物性評価と材料開発2021

    • Author(s)
      有沢 俊一, 田中 康資, 山森 弘毅, 柳澤 孝, 常盤和靖, 石津寛, 西尾 太一郎, 立木 実, 大井 修一, 菊池 章弘, 許斐太郎, 久保毅幸, 井藤隼人, 加古永治, 阪井寛志, 梅森健成, 林 忠之, 遠藤 和弘, Petre Badica
    • Organizer
      NIMS先端計測シンポジウム2022
    • Related Report
      2021 Annual Research Report
  • [Presentation] ファーナスベーキングによる高Q値超伝導加速空洞の探索2021

    • Author(s)
      井藤隼人, 荒木隼人, 高橋光太郎, 梅森健成
    • Organizer
      第18回日本加速器学会年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Systematic investigation of mid-T furnace baking for high-Q performance2021

    • Author(s)
      H. Ito, H. Araki, K. Takahashi, K. Umemori
    • Organizer
      2021 Innternational conference on RF superconductivity
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] High-Q performance of SRF cavities by mid-T furnace baking at KEK2021

    • Author(s)
      井藤 隼人
    • Organizer
      TESLA Technology Collaboration meeting (TTC meeting)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 900 deg Annealing / Cold EP / 2-step baking at KEK2021

    • Author(s)
      片山 領
    • Organizer
      International Workshop on Future Linear Colliders (LCWS2021)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 高純度ニオブにおける vortex bundle の磁気光学観察2021

    • Author(s)
      大井 修一
    • Organizer
      日本物理学会 第76回年次大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Observation of Vortex Bundles in Type-II/1 Superconductor Niobium by Magneto-optical Imaging2020

    • Author(s)
      大井 修一
    • Organizer
      The 33rd International Symposium on Superconductivity
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] High-Q/High-G R&D of SRF cavities by applying 2-step baking at KEK2020

    • Author(s)
      片山 領
    • Organizer
      Americas Workshop on Linear Colliders 2020 (AWLC2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Development of the temperature and magnetic field mapping system for superconducting cavities2020

    • Author(s)
      岡田 貴文
    • Organizer
      第17回加速器学会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Vertical test results of TESLA 9-cell superconducting cavities at KEK-STF2020

    • Author(s)
      片山 領
    • Organizer
      第17回加速器学会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Theoretical foundation for high acceleration gradient and high Q value of superconducting cavities2020

    • Author(s)
      久保 毅幸
    • Organizer
      第17回加速器学会
    • Related Report
      2020 Annual Research Report
  • [Presentation] New results of KEK N-infusion and mid-T baking2020

    • Author(s)
      梅森 健成
    • Organizer
      TESLA Technology Collaboration meeting (TTC meeting)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Magneto-optical imaging of field profile on niobium surface with microstructures of niobium hydrides and a single grain boundary2019

    • Author(s)
      大井 修一
    • Organizer
      32nd International Symposium on Superconductivity (ISS2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Study on Nitrogen Infusion using KEK new furnace2019

    • Author(s)
      梅森 健成
    • Organizer
      19th International Conference on RF Superconductivity(SRF19)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Development of Temperature and Magnetic field mapping system for superconducting cavities at KEK2019

    • Author(s)
      岡田 貴文
    • Organizer
      19th International Conference on RF Superconductivity(SRF19)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] KEKにおける超伝導空洞のための温度・磁場マッピング装置の開発2019

    • Author(s)
      岡田 貴文
    • Organizer
      第16回加速器学会年会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Study of magneto-resistance for low magnetic field measurements2019

    • Author(s)
      植木 竜一
    • Organizer
      MT26 (International Conference on Magnet Technology)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research

URL: 

Published: 2019-04-18   Modified: 2023-01-30  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi