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1993 Fiscal Year Final Research Report Summary

Research for development of a large spectrometer for Quark Gluon Plasma search

Research Project

Project/Area Number 04044031
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionInstitute of Physics, University of Tsukuba

Principal Investigator

YAGI Kousuke  Institute of Physics, University of Tsukuba, Professor, 物理学系, 教授 (60028107)

Co-Investigator(Kenkyū-buntansha) NAYAK T  Institute of Physics, Columbia University, Assistant, 物理学科, 助手
ZAJC W.A.  Institute of Physics, Columbia University, Associate Professor, 物理学科, 助教授
NAGAMIYA S.  Institute of Physics, Columbia University, Professor, 物理学科, 教授
富沢 和之  筑波大学, 物理学系, 助手 (50241782)
KURITA Kazuyoshi  Institute of Physics, University of Tsukuba, Assistant, 物理学系, 助手 (90234559)
ARAI Ichirou  Institute of Physics, University of Tsukuba, Assistant Professor, 物理学系, 講師 (50134440)
MIAKE Yasuo  Institute of Physics, University of Tsukuba, Associate Professor, 物理学系, 助教授 (10157422)
Project Period (FY) 1992 – 1993
KeywordsQuark Gluon Plasma / Relativistic Heavy Ion Collisions / Large Spectrometer / Particle Identification / High Resolution TOF / Plastic Scintillator / Electromagnetic Calorimeter
Research Abstract

At very early stage of our Big Bang Universe, it is believed to have existed a hot and highly exited state of matter, called "Quark Gluon Plasma(QGP)". The goal of this research is to design a large spectrometer to detect QGP which is assumed to be recreated in high energy heavy ion collisions. At 100GeV/c per nucleon in collider mode, Au-Au collisions create over 5000 charged particles.
We focused on the hadron channel as signatures of QGP and designed a time of flight(TOF) which is best suited for particle identification in the momentum region between 0.5 and 2.5 GeV/c. To separate pions and kaons well at 5m away from collision point, we need to achieve time resolution less than 100 ps. The shape of the scintillator was determined from the particle density to be a square rod whose width and thickness are about 1 cm and the length is 1-3 m. To accomplish the time resolution(less than 100 ps), we performed the following tests.
*To avoid degradation of rise time of PMT signals through signal cables, we invented a discriminator which is mounted directly on a PMT. We found that rise time was shortened by 30%.
*Selection of scintillator material and shape.
*Position dependence of pulse height and time resolution was measured. We found pulse attenuation length is larger than time resolution degradation length by factor of 2. It means that time resolution of scintillation counter solely depends on photon statistics.
*We constructed 100 array of TOF and obtained time resolution of 55ps. It gave us the basis of the PHENIX TOF construction. Our technique developed in this research opened possibility of utilizing an electromagnetic calorimeter as a particle identification device.

  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] Miake,Y. 他: "Timing resolutions of bulk,fiber,and super scintillator" Contributed Papers for the International Conference of Quark Matter 93. 7-E. 34-34 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yagi,K.: "PHENIX Experiment at BNL-RHIC" Proceedings of the Second Japanese-Korean Joint Workshop on Strangeness in Nuclear Matter. (受理づみ). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Miake,Y.: "Strangeness Production in Heavy Ion Collisions" Proceedings of the Second Japanese-Korean Joint Workshop on Strangeness in Nuclear Matter. (受理づみ). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kurata,M. 他: "Performance of long high-resolution time-of flight scintillators for relativistic heavy-ion experiments" Nucl.Instr.Methods. (発表予定).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kumagai,A. 他: "High-resolution time-of flight detector system using on-tube discriminator" Nucl.Instr.Methods. (発表予定).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 八木浩輔: "われわれはビッグバン直後に到達できるか" 原子核研究. 36. 1-4 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 三明康郎: "PHENIXの目指すもの" 原子核研究. 36. 33-42 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 三明康郎,八木浩輔: "クォーク・グルオンプラズマは見つかるか" パリティ(丸善). 8. 36-40 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 八木浩輔: "ビッグバン直後に到達できるか" パリティ(丸善). 8. 31-37 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nagamiya,S他: "PHENIX Conceptual Design Report" Brookhaven National Laboratory,USA, 425 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Miake, Y. et al.: "Timing resolution of bulk, fiber and super scintillator" Contributed Papers for the International Conference of Quark Matter '93. 1-E. 34-34 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yagi, K.: "PHENIX Experiment at BNL-RHIC" Proceedings of the Second Japanese-Korean Joint Workshop on Strangeness in Nuclear Matter. (accepted). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Miake, Y.: "Strangeness Production in Heavy Ion Collisions" Proceedings of the Second Japanese-Korean Joint Workshop on Strangeness in Nuclear Matter. (accepted). (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kurata, M. et al.: "Performance of long high-resolution time-of-flight scintillators for relativistic heavy-ion experiments" Nucl.Instr. & Meth.(to be submitted).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kumagai, A. et al.: "High-resolution time-of-flight detector system using on-tube-discriminator" Nucl.Instr. & Meth.(to be submitted).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yagi, K.: "Can we reach the time right after the Big Bang?" Nuclear Studies. 36. 1-4 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Miake, Y.: "Nuclear Studies" Reasearch for Nuclei. 36. 33-42 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yagi, K.: "Can we reach the time right after the Big Bang?" Parity. 8. 31-37 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nagamiya, S. et al.: Brookhaven National Laboratory, USA. PHENIX Conceptual Design Report, 425 (1993)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1995-02-07  

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