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Development of Positron Mass-Production Method

Research Project

Project/Area Number 03559004
Research Category

Grant-in-Aid for Developmental Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 広領域
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

MOHRI Akihiro  Kyoto Univ., Fac.of Integrated Human Studies, Prof., 総合人間学部, 教授 (10025926)

Co-Investigator(Kenkyū-buntansha) OKUDA Soichiro  Mitsubishi Electric Corp.Central Res.Lab., Group Manager, 中央研究所, グループマネージャー
KAWASE Yoichi  Kyoto Univ., Research Reactor Institute, Prof., 原子炉実験所, 教授 (60027448)
TANAKA Hitoshi  Kyoto Univ., Fac.of Integrated Human Studies, Res.Assist., 総合人間学部, 助手 (90183863)
MICHISHITA Toshinori  Kyoto Univ., Fac.of Integrated Human Studies, Res.Assist., 総合人間学部, 助手 (00166050)
YUYAMA Tetsumori  Kyoto Univ., Fac.of Integrated Human Studies, Res.Assist., 総合人間学部, 助手 (90026815)
奥田 壮一郎  三菱電機(株), 中央研究所, グループマネージャー
Project Period (FY) 1991 – 1993
Project Status Completed (Fiscal Year 1993)
Budget Amount *help
¥13,000,000 (Direct Cost: ¥13,000,000)
Fiscal Year 1993: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1992: ¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 1991: ¥6,300,000 (Direct Cost: ¥6,300,000)
KeywordsSlow positron / Positron production / LINAC / Pair creation / Converter / Moderator / Magnetic duct as / Solid film of gas atoms / LINAC / 電子ビーム / 磁場ダクト / 貴ガス氷薄膜 / 減速材 / ライナック応用 / 光子一陽電子変換器 / 陽電子プラズマ / ambiプラズマ / 再減速器 / 対創生 / 対消滅 / 光子-陽電子変換器 / 陽電子移送磁場チャンネル
Research Abstract

The research and development on positron mass-production by using a high current LINAC have been performed for three years. The following improvements in Production Efficiency of Low Energy Positrons have been obtained.
1. Efficient converter, named "Modular Photon-Positron Converter"(MPPC), form energetic photons to slow positrons were developed. This converter can enlarge the positron emitting surface of tungsten foils which emit slow positrons at bombardment of energetic photons, and also extract them by applying effective electric field. Experiments on the proof of the principle showed that MPPC works well and the production rate is in agreement of the estimation based on Monte-Carlo simulations using EGS4 code.
2. Efficient converter, named "Photon-Nonthermal Positron Converter"(PNPC), was developed. Extraction of positrons of low energy region can increase the net positron production efficiency dramatically. It was experimentally proved that the production rate per unit surface area of tungsten foil became 15-20 times that in the case of (1). The attained production rate during the LINAC beam pulse was 2 X 10^<13>[e^+/s] and the time averaged one for 100 pps reached 8 X 10^8[e^+/s], in spite of the used low LINAC beam energy as 30 MeV.This converter is very simple in structure and it can be fablicated easily.
3. Other developments in transportation of positrons with a magnetic duct and also in remoderation of them were made. The attained time averaged production rate of positrons below 6 eV was 3.3 X 10^7[e^+/s].

Report

(4 results)
  • 1993 Annual Research Report   Final Research Report Summary
  • 1992 Annual Research Report
  • 1991 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] 毛利明博: "Method to Generate a Large Number of Slow Positron Production with a Modular Photon-Positron Converter" Jpn.J.Appl.Phys.30. L936-L939 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 田中仁: "Slow Positron Production with a Modular Photon-Positron Converter Attached to a High-Current LINAC" Jpn.J.Appl.Phys.31. 4029-4036 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 毛利明博: "Production and Stacking of Slow Positron Beams Generated with a High Current LINAC" Proc.of 10th International Conference on Positron Annihilation,(Beijing,May,1994). (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 毛利明博: "固体キセノン薄膜を用いた陽電子の減速" 京都大学原子炉研究所報告:「放射線誘起構造変化」 KURRI-TR-383. 10-15 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 湯山哲守: "LINACを用いた陽電子の発生" 京都大学原子炉実験所第27回学術講演会報文集. 1-6 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 道下敏則: "陽電子の磁場閉じ込め" 京都大学原子炉実験所第27回学術講演会報文集. 7-10 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] A.Mohri: "Method to Generate a Large Number of Slow Positron Production with a Modular Photon-Positron Converter" Jpn.J.Appl.Phys.30-5B. L936-939 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] H.Tanaka: "Slow Positron Production with a Modular Photon-Positron Converter Attached to a High-Curent LINAC" Jpn.J.Appl.Phys.31-12A. 4029-4036 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] A.Mohri: "Production and Stacking of Slow Positron Beams Generated with a High Current Linac" Proc.of 10th Int.Conf.Positron Annihilation, (Beijing, May, 1994) paper : C1-1. (to be published).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] A.Mohri: "Moderation of positrons with a Solid film of Xenon" KURRI Report : KURRI-TR-383, Radiation-Induced Structual. Changes(IV). 10-15

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] Y.Yuyama: "Production of Positrons using LINAC" Prod.27th Sci.Meeting of KURRI. 1-6 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] T.Michishita: "Magnetic Confinement of Positrons" Prod.27th Sci.Meeting of KURRI. 7-10 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1993 Final Research Report Summary
  • [Publications] 湯山哲守: "LINACを用いた陽電子の発生" 京都大学原子炉実験所第27回学術講演会報文集. 1-6 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 道下敏則: "陽電子の電磁閉じ込め" 京都大学原子炉実験所第27回学術講演会報文集. 7-10 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 毛利明博: "固体キセノン薄膜を用いた陽電子の減速" 京都大学原子炉実験所「放射線誘起構造変化(IV)」KURRI-TR-383. 10-14 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] 田中仁: "Sloco Positron Production with a Modular Photon-Positron Converter Attached to a High Current LINAC" Japanese Journal of Applied Physics. 31. 4029-4036 (1992)

    • Related Report
      1993 Annual Research Report
  • [Publications] 湯山 哲守: "LINACを用いた陽電子の発生" 京都大学原子炉実験所第27回学術講演会報文集. 1-6 (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] 道下 敏則: "陽電子の電磁閉じ込め" 京都大学原子炉実験所第27回学術講演会報文集. 7-10 (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] 田中 仁: "Slow Positron Production with a Modular Photon-Positron Converter Attached to a High-Current LINAC" Japanese Journal of Applied Physics. 31. 4029-4036 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 毛利 明博: "ライナックを用いた低速陽電子発生実験" 京都大学原子炉実験所第26回学術講演会報文集. 195-199 (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 毛利 明博: "MASS PRODUCTION and ACCUMULATION of SLOW POSITRON to FORM a POSITRON PLASMA" Proc.of 1992 International Conference on Plasma Physics. (1992)

    • Related Report
      1991 Annual Research Report

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Published: 1991-04-01   Modified: 2016-04-21  

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