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Study of a Polarized Positron Source for Linear Colliders

Research Project

Project/Area Number 10640294
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionHigh Energy Acclerator Research Organization

Principal Investigator

OMORI Tsunehiko  Institute of Particle and Nuclear Studies, Research Associate, 素粒子原子核研究所, 助手 (80185389)

Co-Investigator(Kenkyū-buntansha) URAKAWA Jyunji  Accelerator Laboratory, Associate Professor, 加速器研究施設, 助教授 (00160333)
TAKEDA Seishi  Accelerator Laboratory, Associate Professor, 加速器研究施設, 助教授 (40029898)
KURIHARA Yoshimasa  Institute of Particle and Nuclear Studies, Research Associate, 素粒子原子核研究所, 助手 (50195559)
KUMITA Tesurou  Tokyo Metropolitan University, Department of Physics, Research Associate, 理学部, 助手 (30271159)
Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1999: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1998: ¥1,900,000 (Direct Cost: ¥1,900,000)
Keywordspolarized positron beam / linear collider / laser-Compton scattering / linear collider / リニアコライダー / レーザーコンプトン散乱 / lincar collider
Research Abstract

Studies were done at the Accelerator Test Facility (ATF) in KEK.As the first step, we performed the experiment to generate positrons via pair-creation from Compton scattered gamma-rays. In the experiment, we aimed to confirm that number of positron generated by our apparatus agreed to the design value. The 1.28 GeV electron beam extracted from the ATF collided with the laser beam of 2nd harmonic of the Nd : YAG laser. The energy of a laser photon is 2.33 eV.This collision generated gamma-rays which maximum energy was 56 MeV.The gamma-rays were injected to the 1-mm-thick tungsten target to generate positrons. The number of generated positrons was about 250 at just downstream of the target. This value agreed the design value within the expected error. The results of the experiment was published in "Nuclear Instruments and Methods in Physics Research". We did not measure the polarization of the positrons in this experiment.
From the experience of the first step, we recognized that the existence of the background particles from the ATF accelerator was the serious obstruction against the polarization measurement. Therefore, as the second step, we performed following three developments.
1. Development of the detector which has no sensitivity to low energy particles (most of background particles have low energy), but has high sensitivity to positrons generated by Compton scattered gamma-rays.
2. Development of the detailed simulation code for polarization measurement.
3. Construction of shields around the beam pipe to reduce the background particles.
Through R/Ds of above three subjects we did accumulate large amount of data and experiences which are necessary to achieve the Polarization measurement. We believe those are of great use when we will perform further investigation to realize the polarize the polarized positron source.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] K.Dobashi 他8名: "Generation of Positrons Pair-Creation from Compton Scattered Gamma-Rays"Nuclaer Instrments and Methods in Physics Research. A437. 169-177 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K.Dobashi 他11名: "Production of a Polarized positron and Measurement of Its Polarization"Nuclear Instruments and Methods in Physics Research. A(印刷中(10月号)). (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K.Dobashi, T.Hirose, T.Kumita, Y.Kurihara, T.Muto, T.Omori, T.Okugi, K.Sugiyama, and J.Urakawa: "Generation of Positrons via Pair-Creation from Compton Scattered Gamma-Rays"Nuclaer Instrments and Methods in Physics Research. A437. 169-177 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K.Dobashi, M.Fukuda, A.Higurashi, T.Hirose, T.Kumita, Y.Kurihara, T.Muto, T.Okugi, T.Omori, I.Sakai, J.Urakawa, and M.Washio: "Production of a polarized positron and Measurement of Its Polarization"Nuclear Instruments and Methods in Physics Research. A(will be appeared). (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] K. Dobashi 他8名: "Generation of Positrons via Pair-Creation from Compton Scattered Gamma-Rays"Nuclear Instruments and Methods. A437. 169-177 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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