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Generation of high intensity, multi-bunch polarized positron beams

Research Project

Project/Area Number 11694092
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionTokyo Metropolitan University (TMU)

Principal Investigator

HIROSE Tachishige  TMU, Graduate school of science, Professor, 理学研究科, 教授 (70087162)

Co-Investigator(Kenkyū-buntansha) URAKAWA Junji  KEK, Accelerator Lab, Associate professor, 加速器施設, 助教授 (00160333)
WASHIO Masakazu  Waseda Uni., Advanced Research Inst. for Sci. & Engineering, Professor, 理工学総合センター, 教授 (70158608)
KUMITA Tetsuro  TMU, Graduate school of science, Research associate, 理学研究科, 助手 (30271159)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥14,300,000 (Direct Cost: ¥14,300,000)
Fiscal Year 2000: ¥6,600,000 (Direct Cost: ¥6,600,000)
Fiscal Year 1999: ¥7,700,000 (Direct Cost: ¥7,700,000)
KeywordsCompton chamber / CO2 laser / Plasma channel / Polarized positron beam / JLC / コンプトン散乱 / 非線形効果 / 短パルスX線 / TWレーザー / 炭酸ガスレーザー / ATFダンピングリング / 対生成
Research Abstract

Studies at BNL
In order to attain laser-electon interaction with high luminosity, we constructed a Compton chamber in which laser is strongly focused and makes head-on collisions with electron. In October, 2000, we achieved the highest peak intensity of back scattered X-rays, 7x10^8 photons/sec in the collision of CO_2 laser with 60 MeV electrons. We have also developed plasma channel in which Compton scattering takes place for the laser beam confined in the channel. Thus the interaction length is elongated, resulting in the increase of the back scattered X-rays. We have successfully fablicated the plasma channel of 2 cm in length and 300 μm in radius having low density(10^<17>/cm^3).
Studies at KEK
We have been pursuing systematic studies on polarized positron productions through Compton scattering and pair creation processes. Gamma-rays of 2x10^5/pulse was created in Compton scattering of a 532 nm laser light off the 1.28 GeV electron. We also have made the conceptual design of the polarized positron beam for JLC which requires highly intensive positron beams with the intensity of 10^<10> e^+ /pulse and a complicated multibunch structure, i.e. 95 pulses with the time interval of 2.8 ns repeating 150 Hz. It is found that positrons 3x1^<10> /pulse can be generated using the electron beams of 5.8 GeV with the intensity of 5x10^<10> /bunch and 50 peices of CO_2 lasers.

Report

(3 results)
  • 2001 Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (24 results)

All Other

All Publications (24 results)

  • [Publications] K.Dobashi, T.Hirose他: "Generation of positions via pair creation from"Nucl.Inst A Mesh.Phys.Res.. A437. 169-177 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Okugi, T.Hirose他: "Evaluation of vertical emittance in KEK-ATF"Nucl.Inst A Mesh.Phys.Res.. A455. 207-212 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S.Kashiwagi, T.Hirose他: "Observation of high intensity X-rays"Nucl.Inst A Mesh.Phys.Res.. A455. 36-40 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K.Dobashi, T.Hirose他: "Production of polarized positions"Nucl.Inst A Mesh.Phys.Res.. A455. 32-35 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] I.Pogorelsky, T.Hirose他: "Femtosecond laser synchrotron sources"Nucl.Inst A Mesh.Phys.Res.. A455. 176-179 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Hirose: "Polarized position source"Nucl.Inst A Mesh.Phys.Res.. A455. 15-24 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 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"Nucl. Inst. & Meth. Phys. Res. A. 437. 169-177 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Okugi, H. Hayano, K. Kubo, T. Naito, N. Terunuma, J. Urakawa, T. Hirose, F. Zimmermann and T. Raubenheimer: "Evaluation of vertical emittance in KEK-ATF"Nucl. Inst. & Meth. Phys. Res. A.. 455. 207-212 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] S. Kashiwagi, M. Washio, T. Hirose: "Observation of high intensity X-rays in inverse Compton scattering"Nucl. Inst. & Meth. Phys. Res. A.. 455. 36-40 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K. Dobashi, A. Higurashi, T. Hirose, T. Kobuki, T. Kumita, Y. Kurihara, T. Muto, T. Omori, T. Okugi, J. Urakawa and M. Washio: "Production of polarized positron and measurement of its polarization"Nucl. Inst. & Meth. Phys. Res. A.. 455. 32-35 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] I. V. Pogorelsky, I. Ben-Zvi, X.J. Wang and T. Hirose: "Femtosecond laser synchrotoron sources based on Compton scattering in plasma channels"Nucl. Inst. & Meth. Phys. Res. A.. 455. 176-179 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Hirose: "Polarized positron source for the future linear collider, JLC"Nucl. Inst. & Meth. Phys. Res. A.. 455. 15-24 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Hirose 他8名: "Polarized positron source for the fure linearcollider, JLC"Nucl.Inst.& Meth.Phys.Res.A. 455. 15-24 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Hirose: "generation of polarized positrons"Proc.of Int.Conf.Laser'99(Quebec, Canada). 294-297 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Hirose 他8名: "generation of positrons via paircreation…"Nucl.Inst & Meth.Phys.Res.A. 437. 169-177 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Hirose 他18名: "Demonstration of 8×10^<18> photons/second…"Phys Res.ST Accel.Beams. 3-090702. 1-8 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Hirose 他18名: "Evaluation of extremely small horizontal emittance…"Phys Res.ST Accel.Beames. 2-022801. 1-9 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] 広瀬立成: "コンプトン散乱:新しい光を求めて"日本物理学会誌. 54. 862-868 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Hirose 他8名: "Polarized positron source for the linear collider."Nucl Inst. A Meth. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] M.Washio: "High quality beam generation using RF gun・・・"Nucl. Inst. A Meth. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] H.Iijima 他4名: "Laser cooling of or tho-Positronium"Nucl. Inst. A Meth.. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] J.Urakawo: "Third generation electron beams"Nucl Inst. A Meth. (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Hirose: "Generation of polarized positron"Proceedings of Laser'99(Quebec). (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 広瀬立成: "コンプトン効果今昔物語"日本物理学会誌. 54. 862-868 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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