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

Particle Identification of High-Energy Heavy Ions by a Tilted Electrode Gas Ionization Chamber

Research Project

Project/Area Number 14540284
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 InstitutionNagasaki Institute of Applied Science

Principal Investigator

KIMURA Kikuo  Nagasaki Institute of Applied Science, Engineering, Professor, 工学部, 教授 (60108636)

Project Period (FY) 2002 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2003: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2002: ¥2,800,000 (Direct Cost: ¥2,800,000)
KeywordsGas Ionization Chamber / Unstable Nucleus Beam / Particle Identification / RI Beam Factory / Heavy Ion / 高エネルギー重イオン / RIビーム / ガス電離箱 / 粒子識別
Research Abstract

A high rate particle identification device for high-energy heavy ions, which is intended to be used in the forthcoming RI beam factory has been developed. A gas detector named tilted electrode gas ionization chamber was constructed and was tested at the RIKEN ring cyclotron. Gas length dependence of the detector resolution was measured using nuclear fragments of 56Fe. It was found that the resolution was nearly proportional to inverse square of gas length just as expected when the resolution is determined simply by statistical fluctuations of ionization loss. But the resolution does not tend to zero toward the infinite gas length and has a small offset. This offset value increases with the increase of the atomic number Z of the detected particles. Up to Z=25, the resolution remains well within the acceptable value. But if we extrapolate the increasing trend toward larger Z, the resolution exceeds the acceptable value around Z=50. The reason of this deterioration of the resolution seems to be due to the electrode foils used in our detector. It is thus necessary to use thinner foils for the identification of heavy ions around Z=50.
Counting rate dependence of the detector resolution was measured using nuclear fragments of 40Ar. In this measurement two kinds of gas mixtures, Ar-CH4 and Ar-CF4, were compared. It was found that the resolution of the gas mixture Ar-CH4 is very good up to a counting rate of 300kcps but deteriorates rapidly above this counting rate. In contrast to this, the resolution of the gas mixture Ar-CF4 was found to be almost constant up to the measured maximum counting rate 1Mcps. The better rate dependence of the gas mixture Ar-CF4 is probably due to a larger electron drift velocity of this gas compared to the gas mixture Ar-CH4. As for high-rate operation of the detector, a satisfactory result was obtained.

Report

(3 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • Research Products

    (7 results)

All Other

All Publications (7 results)

  • [Publications] Y.Yamaguthi, K.Kimura その他: "Development of Ion Chamber"RIKEN Accelerator Progress Report. 36. 161-162 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Sugawara, K.Kimura その他: "Performance study of the big ion chamber"RIKEN Accelerator Progress Report. 37(発表予定). (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Yamaguchi, K.Kimura et al.: "Development of Ion Chamber"RIKEN Accelerator Progress Report. 36. 161-162 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] K.Sugawara, K.Kimura et al.: "Performance study of the big ion chamber"RIKEN Accelerator Progress Report. 37(to be published). (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Y.Yamaguchi, K.Kimuraその他: "Development of Ion Chamber"RIKEN Accelerator Progress Report. 36. 161-162 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Sugawara, K.Kimuraその他: "Performance study of the big ion chamber"RIKEN Accelerator Progress Report. 37(発表予定). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Kimura他: "Particle identification of high-energy heavy ions by a tilted electrode gas ionization chamber"長崎総合科学大学工学研究センター所報. 17号. 23-26 (2003)

    • Related Report
      2002 Annual Research Report

URL: 

Published: 2002-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi