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Polarized Electron Beam Experiments at Bonn and Mainz Universities

Research Project

Project/Area Number 06044093
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionNagoya University

Principal Investigator

NAKANISHI Tsutomu  Nagoya University, Professor, 理学部, 教授 (40022735)

Co-Investigator(Kenkyū-buntansha) TOYAMA Tsuyoshi  KEK (National Laboratory for high energy physics), Research Associate, 加速器研究部, 助手 (30207641)
SATOH Hikaru  KEK (National Laboratory for high energy physics), Professor, 加速器研究部, 教授 (80100816)
ARENDS H.j.  Mainz University, Professor, 原子核物理教室, 教授
REICHERT E.  Mainz University, Professor, 物理教室, 教授
ALTHOFF K.h.  Bonn University, Emeritus Professor, 物理教室, 名誉教授
REICHERT T.  Bonn大学, 物理教室, 教授
HUSMANN D.  Bonn University, Professor, 物理教室, 教授
SCHOCH B.  Bonn University, Professor, 物理教室, 教授
REICHELT T.  Bonn University, Professor
ARENDS J.  Mainz大学, 物理教室, 教授
VON Drachenc  Bonn大学, 助教授
REICHELT T.  Bonn大学, 助教授
MEYER W.  Bonn大学, 講師
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥9,600,000 (Direct Cost: ¥9,600,000)
Fiscal Year 1995: ¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 1994: ¥4,900,000 (Direct Cost: ¥4,900,000)
KeywordsPolarized electron source / Polarization / quantum efficiency / Photocathode / strained GaAs / superlattice / depolarization / GDH experiment / 偏極電子 / 偏極ビーム / 偏極ターゲット / 偏極電子銃 / Drell-Hearn-Gerasimov総和則
Research Abstract

Recently polarized electron beam is considered as an indispensable tool in particle and nuclear physics, and most of electron accelerators in world have facilities of polarized electron source. They are Bonn, CEBAF,MIT-Bates, Mainz, NIKHEF,Novosibirsk and SLAC etc.
In this program, the main subject is the GDH experiments at MAMI/Mainz and ELSA/Bonn which was proposed in 1993 and 1991, respectively. Since then, developments of polarized electron sources at Bonn and Mainz have been continued. The photocathodes which can produce high polarization and quantum efficiency beam, such as strained GaAs or AlGaAs/GaAs superlattice had been developed intensively at Nagoya university. The application of such photocathodes are expected to make important contributions for Mainz and Bonn experiments.
At Mainz, the superlattice cathode was tested by a 100 KeV gun, and the polarization 62% was obtained with high quantam efficiency of 2.0%. The source could produce a 50 micro-A DC beam, and 10% of this beam could be delivered to the target by MAMI.For GDH experiment, the preparations of polarized beam and target, spectrometers, datataking system to measure the total cross-sections with spin paralell andanti-parallel have been made, and the first machine time is scheduled infall of 1996.
At Bonn, a recently constructed 120 KeV polarized electron source could produce a design-valued intensity of 100 mA for 1 micro-sec laser pulse. The design and construction of accelerating electrodes for this gun were made at Nagoya university. The field emission current between electrodes was suppressed less than 5 nA and it assured the long cathode-lifetime. At moment, 0.2 nA of polarized beam could be extracted from ELSA,and as a next step, a study to overcome a depolarization problem is scheduled in 1996 to accelerate polarized electrons up to 3.5 GeV.

Report

(2 results)
  • 1995 Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (26 results)

All Other

All Publications (26 results)

  • [Publications] Y.Kurihara 他19名: "A High Polarization and High Quantum EHiciency Photocathode Using a GaAs-AlGaAs Super lattice" Japanese Journal of Applied Physics. 34. 355-358 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Horinaka 他6名: "Circular Polarization of Photo luminescence Excitation Spectra of Strained GaAs Layer" Japanese Journal of Applied Physics. 34. 179-182 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Omori 他12名: "Highly Polarized Electron Source using In GaAs-GaAs Strained Layer Superlattice" Japanese Journal of Applied Physics. 33. 5676-5680 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Nakanishi: "The New Generation of Polarized Electran Source" Proceedings of the 5th Conference on Intersections of Particle and Nuclear Physics,May 31-June 6,1994,St.Petersburg,Florida. 344-350 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 津幡充 他12名: "ブラッグ反射鏡を用いた高性能偏極電子源" Proceedings of the 19th Linear Accelerator Mecting in Japan,July 20-22,Tokai,Japan,JAERI-Conf. 94-003. 130-132 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 坂貴,加藤俊宏,中西彊: "共鳴吸収型スピン偏極電子源" 電気製鋼. 66 第2号. (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Horinaka 他10名: "Spin Ralaxation of Electrons in Strained-GaAs-Layer Photocathode of Polarized Electron Source" Jpn.J.AppL.Physics. 34. 6444-6447 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Togawa 他8名: "Design and Construction of Accelerating Electrodes for a 120keV Polarized Electron Gun at Bonn University" Proceedings of the 20th Linear Accelerator Meeting in Japan. 47-49 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] C.Suzuki 他8名: "Ultra High Vacuum-High Voltage D.C.Gun" Proceedings of the 20th Linear Accelerator Meeting in Japan. 154-156 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Togawa 他8名: "Design and Construction of Accelerating Electrodes for a Polarized Electron Gun at the Bonn Stretcher Accelerator ELSA" Bonn-Me-95-01/DPNU-95-33. 1-11 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Kurihara, T.Nakanishi et al.: "A High Polarization and High Quantum efficiency photocathode using a GaAs-AlGaAs Superlattice" Japanese Journal of Applied Physics. 34. 355-358 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Horinaka, T.Nakanishi et al.: "Circular Polarization of Photoluminescence Excitation Spectra of Strained GaAs Layr" Japanese Journal of Applied Physics. 34. 179-182 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Omori, T.Nakanishi, et al.: "Highly Polarized Electron Source using InGaAs-GaAs Strained Layr Superlattice" Japanese Journal of Applied Physics. 33. 5676-5680 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Nakanishi: "The New Generation of Polarized Electron Source" Proceedings of the 5th Conference on Intersections of Particle and Nuclear Physics, 1994, St.Petersburg, Florida. AIP Conference Proceedings 338. 344-350 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] M.Tsubata et al.: "High Quantum Efficiency Polarized Electron Source with a Distributed Bragg Reflector.(in Japanese)" Proceedings of the 19th Linear Accelerator Meeting in Japan, July 20-22, Tokai, Japan, JAERI-Conf. 94-003. 130-132 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] T.Saka et al.: "Resonance-Absorption-Type Polarized Electron Source (in Japanese)" Denkiseiko. 66 No.2. (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Horinaka et al.: "Spin Relaxation of Electrons in Strained-GaAs-Layr Photocathode of Polarized Electron Source" Jpn.J.Appl.Physics. 34. 6444-6447 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Togawa, T.Nakanishi et al.: "Design and Construction of Accelerating Electrodes for a 120 KeV Polarized Electron Gun at Bonn University" Proceedings of the 20th Linear Accelerator Meeting in Japan. 47-49 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] C.Suzuki et al.: "Ultra High Vacuum-High Voltage D.C.Gun" Accelerator Meeting in Japan. (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Togawa, T.Nakanishi et al.: "Design and Construction of Accelerating Electrodes for a polarized Electron Gun at the Bonn Stretcher Accelerator ELSA" Bonn-ME-95-01/DPNU-95-33. 1-11 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Kurihara 他19名: "A High Polarization and High Quantum Efficiency Photocathode Using a GaAs-AlGaAs Superlattice" Japanese Journal of Applied Physics. 34. 355-358 (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] H.Horinaka 他6名: "Circular Polarization of Photoluminescence Excitation Spectra of Strained GaAs Layer" Japanese Journal of Applied Physics. 34. 179-182 (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] T.Omori 他12名: "Highly Polarized Electron Source using InGaAs-GaAs Strained Layer Superlattice" Japanese Journal of Applied Physics. 33. 5676-5680 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] T.Nakanishi: "The New Generation of Polarized Electron Source" Proceedings of the 5th Conference on Intersections of Particle and Nuclear Physics,May31-June6,1994,St.Petersburg,Florida.

    • Related Report
      1994 Annual Research Report
  • [Publications] 津幡充 他12名: "ブラッグ反射鏡を用いた高性能偏極電子源" Proceedings of the 19th Linear Accelerator Meeting in Japan,July20-22,Tokai,Japan,JAERI-Conf. 94-003. 130-132 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] 坂貴,加東俊宏,中西彊: "共鳴吸収型スピン偏極電子源" 電気製鋼. 66第2号. (1995)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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