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Study of the Ultracold and Ultrafast Beam-Cooling with a Superconducting Electron Cooler

Research Project

Project/Area Number 08504002
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field 素粒子・核・宇宙線
Research InstitutionUniversity of Tokyo

Principal Investigator

TANABE Tetsumi  University of Tokyo School of Science, Professor, 大学院・理学系研究科, 教授 (20013394)

Co-Investigator(Kenkyū-buntansha) NODA Kouji  National Institute of Radiological Sciences, Division of Accelerator Physics and, 医用重粒子物理工学研究部, 主任研究官 (80228329)
CHIDA Katsuhisa  High Energy Acceleraor Reseach Organization, Research Associate, 助手 (90013391)
KATAYAMA Ichiro  University of Tokyo School of Science, Professor, 大学院・理学系研究科, 教授 (30028237)
菅井 勲  東京大学, 原子核研究所, 助手 (80150291)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥46,400,000 (Direct Cost: ¥46,400,000)
Fiscal Year 1997: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1996: ¥41,900,000 (Direct Cost: ¥41,900,000)
KeywordsAccelerator / Electron Cooling / Superconducting Magnet / Atomic Physics / Atomic Collisions / Dissociative Recombination
Research Abstract

An electron cooling method has widely been used in the atomic physics research as well as accelerator technology. The cooling time and the final accuracy in experiments are determined by the electron temperature. The electron beam has initially an energy width (or temperature) of about 100 meV,since electrons are emitted from a hot cathode. However, electron temperature can be reduced to a level less than the cathode temperature by expanding the electron beam adiabatically in a gradually decreasing solenoid field. This method is called 'adiabatic expansion method' and the electron temperature decreases in inverse proportion to an expansion factor. Based on this principle, we modified the existing electron system to the adiabatic expansion type. In the fiscal 1996, we designed and constructed an superconducting electron cooler with a magnetic field of 3.5 T and realized an expansion factor of 100 resulting in an electron temperature of 1 meV for the first time in the world. The supercon … More ducting magnet is liquid-helium free, which realized a compact design and a simple operation. The cooler opened the way to the super-fast beam cooling and extremely high-accuracy experiments. In the fiscal 1996-1997, highly accurate atomic collision experiments have been performed with this cooler. Dissociative recombination (DR) of molecular ions is one of the important processes in the upper atmosphere and the outer space. The DR of HeH^+ isotopes were studied with the extremely low-temperature electron beam of the order of 1 meV produced by the superconducting electron cooler at the storage ring TARN II.The DR spectra show a fine new structure and a clearisotope dependence in the low energy region. Those features are well reproduced by the theoretical calculations based on a multichannel quantum-defect theory. According to the theory, the newly observed structure is an evidence of a new indirect mechanism. These results on the cooler and the physics experiments have been presented at the domestic conferences in Osaka and at Kobe, and the foreign conferences in Vancouver, Vienna and Heidelberg. We also started the feasibility study of atomic collision experiments with the new cooler on many other ions. Less

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] Tetsumi Tanabe: "Liquid-Helium-Free Superconducting Electron Cooler at the Storage Ring TARN II" Proc.of the Fifth European Particle Accelerator Conference,Sitges(Barcelona),Spain. 1190-1192 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Tetsumi Tanabe: "First Operation of the Liquid-Helium-Free Superconducting Electron Cooler at the TARN II Storage Ring" Proc.of the XVI RCNP Osaka International Symposium on Multi-GeV High-Performance Accelerators and Related Technology,Osaka. 41-45 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Tetsumi Tanabe: "First Operation of the Superconducting Electron Cooler at the Storage Ring TARN II" Proc.of the 1997 Particle Accelerator Conference,Vancouver,Canada,. (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Tetsumi Tanabe: "Dissociative Recombination of Molecular Ions with a 1-meV Temperature Electron Beam from a Superconducting Electron Cooler at the TARN II Storage Ring" Abstracts of contributed Papers on the XXth International Conference on The Physics of Electronic and Atomic Collisions,Vienna,Austria. TU132 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Tetsumi Tanabe: "Operation of the SuperconductingElectron Cooler at the Cooler Ring TARNII" Proc.of the 11th Symposium on Accelerator Science and Technology,Harima Science Garden City. 104-106 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Tetsumi Tanabe: "Dissociative Recombination of HeH^+ Isotopes with an Ultracold Electron Beam from a Superconducting Electron Cooler in a Storage Ring" J.Phys.B:Atomic,Molecular and Optical Physics,Letter to the Editor. (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Tetsumi Tanabe: "LIQUID-HELIUM FREE SUPERCONDUCTING ELECTRON COOLER AT THE STORAGE RING TARN II" Proceedings of the Fifth European Particle Accelerator Conference, Sitges (Barcelona), Spain, June 1996 (Institute of Physics Publishing). 1190-1192

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Tetsumi Tanabe: "FIRST OPERATION OF THE LIQUID-HELIUM-FREE SUPERCONDUCTING ELECTRON COOLER AT THE TARN II STORAGE RING" Proceedings of the XVI RCNP Osaka International Symposium on Multi-GeV High-Performance Accelerators and Related Technology, Osaka, March 1997 (World Scientific). 41-45

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Tetsumi Tanabe: "FIRST OPERATION OF THE SUPERCONDUCTING ELECTRON COOLER AT THE STORAGE RING TARN II" Proceedings of the 1997 Particle Accelerator Conference, Vancouver, Canada. (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Tetsumi Tanabe: "DISSOCIATIVE RECOMBINATION OF MOLECULAR IONS WITH A 1-meV TEMPERATURE ELECTRON BEAM FROM A SUPERCONDUCTING ELECTRON COOLER AT THE TARN II STORAGE RING" Abstracts of Contributed Papers on the Twentieth International Conference on The Physics Electronic and Atomic Collisions, Vienn.Austria. TU132 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Tetsumi Tanabe: "OPERATION OF THE SUPERCONDUCTING ELECTRON COOLER AT THE COOLER RING TARN II" Proceedings of the 11th Symposium on Accelerator Science and Technology, Harima Science Garden City. 104-106 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Tetsumi Tanabe: "DISSOCIATIVE RECOMBINATION OF HeH^+ ISOTOPES WITH AN ULTRACOLD ELECTRON BEAM FROM A SUPERCONDUCTING ELECTRON COOLER IN A STORAGE RING" J.Phys.B : Atomic, Molecular and Optical Physics, Letter to the Editor. (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Tetsumi Tanabe: "Liquid-Helium-Free Superconducting Electron Cooler at the Storage Ring TARN II" Proc.of the Fifth Futopean Particle Accelerator Conference,Sitges (Barcelona),Spain. 1190-1192 (1996)

    • Related Report
      1997 Annual Research Report
  • [Publications] Tetsumi Tanabe: "First Operation of the Liquid-Helium-Free Superconducting Electron Cooler at the TARN II Storage Ring" Proc.of the XVI RCNP Osaka International Symposium on Multi-GeV High-Performance Accelerators and Related Technology,Osaka. 41-45 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Tetsumi Tanabe: "First Operation of the Superconducting Electron Cooler at the Storage Ring TARN II" Proc.of the 1997 Particle Accelerator Conference,Vancouver,Canada,. (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] Tetsumi Tanabe: "Dissosiative Recombination of Molecular Ions with a 1-me V Temperature Electron Beam from a Superconducting Electron Cooler at the TARN II Storage Ring" Abstracts of contributed Papers on the XXth International Conference on The Physics of Electronic and Atomic Collisions,Vienna,Austria. TU132 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Tetsumi Tanabe: "Operation of the Superconducting Electron Cooler at the Cooler Ring TARNII" Proc.of the 11th Symposium on Accelerator Science and Technology Harima Science Garden City. 104-106 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] Tetsumi Tanabe: "Dissosiative Recombination of HeH^+ Isotopes with an Ultracold Electron Beam from a Superconducting Electron Cooler in a Storage Ring" J.Phys.B : Atomic,Molecular and Optical Physics,Letter to the Editor. (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] T.Tanabe: "Liquid-Helium Free Superconducting Electron Cooler at the Storage Ring TARN II" Proc.of the Fifth European Particle Accelerator Conf.1190-1192 (1996)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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