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INVESTIGATION ON HIGH-RESOLUTION RADIATION-DETECTORS BY THE USE OF Nb-BASED TUNNEL JUNCTIONS

Research Project

Project/Area Number 02680187
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Nuclear engineering
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

ISHIBASHI Kenji  KYUSHU UNIVERSITY ASSOC.PROF., 工学部, 助教授 (00159766)

Co-Investigator(Kenkyū-buntansha) MATSUMOTO Yuzuru  KYUSHU TEIKYO JUNIOR COLLEGE PROF., 経営情報科, 教授 (10150484)
Project Period (FY) 1990 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1992: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1991: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1990: ¥1,100,000 (Direct Cost: ¥1,100,000)
KeywordsSUPERCONDUCTING TUNNEL JUNCTION / RADIATION / X RAY / NIOBIUM / ALUMINUM / PHOTOLITHOGRAPHY / フォトリソグラフィ- / 放射線検出器 / x線検出器 / 二オブ / 準粒子
Research Abstract

It has been presumed that superconducting tunnel junctions for radiation detection show better energy resolution than semiconductor detectors. We made a basic research for applying niobium-based tunnel junctions to radiation detection.
Nb/A1-A10x/Nb junctions of a simple structure was fabricated by photolithographic technique, and 5.9 keV X-ray was measured by them. Non-linear interaction between quasi-particles and phonons was analyzed by the coupled Boltzmann equations, and the behavior of quasiparticles and phonons in the superconductor was elucidated.
In order to obtain better energy resolution under the present technical constraint, a study was made on the design method for the optimum niobium-based tunnel junctions. It was found that there exists an optimum value of normal resistance: The energy resolution is deteriorated when junctions have the normal resistance different from the optimum value.
Finally, discussion about advanced tunnel junctions was made from the viewpoint of both multilayer tunnel junctions and materials suitable for radiation detection.

Report

(4 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • 1990 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Kenji Ishibashi: "Output Signal from Nb-Based Tunnel Junctions by Irradiation of 6 keV X-Rays" IEEE Trans.on Magn.27. 2661-2664 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Kazuhiko Takeno: "Properties of Large-Sized Nb-Based Superconducting Tunnel Junctions for X-Ray Detection" Jpn.J.Appl.Phys.30. 1969-1974 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Kenji Ishibashi: "Output Signal from X-Ray Irradiated Nb-Based Tunnel Junctions and Its Analysis on the Basis on the Coupled Boltzman Equations" X-Ray Detection by Superconducting Tunnel Junctions(World Scientific). 151-164 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 森 賢一: "市販バルブを利用した小型 ^3Heクライオスタット" 低温工学. 26. 57-59 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 石橋 健二: "ニオブ系トンネル接合を用いた極低温放射線検出器" 応用物理. 60. 712-715 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Kenji Ishibashi: "Output Signal from Nb-Based Tunnel Junctions by Irradiation of 6 keV-X-rays" IEFE Trans. on Magn.27. 2661-2664 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Kazuhiko Takeno: "Properties of Large-Sized Nb-Based Superconducting Tunnel Junctions for X-Ray Detection" Jpn.J.Appl.Phys.30. 1969-1974 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Kenji Ishibashi: "Output Signal from X-ray Irradiated Nb-Based Tunnel Junctions and Its Analysis on the Basis on the Coupled Boltzmann Equations" X-Ray Detection by Superconducting Tunnel Junctions (A.Barone,Ed.,World Scientific). 151-164 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Ken-ichi Mori: "Small ^3He Cryostat by the Use of Commercial Valves" Teion Kogaku (in Japanese). 26. 57-59 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Kenji Ishibashi: "Cryogenic Radiation Detectors by the Use of Niobium-Based Tunnel Junctions" Oyo Butsuri (in Japanese). 60. 712-715 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] K.Ishibashi Y.Matsumoto: "Quasiparticle Disappearance in Superconducting Tunnel Junctions for X-Ray Defection" Nucl.Instr.Methods Phys.Res.

    • Related Report
      1992 Annual Research Report
  • [Publications] Kenji Ishibashi: "Output Signal from Nbーbased Tunnel Junctions by Irradiation of 6 keV xーrays" IEEE Trans.Magn.27. (1991)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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