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2000 Fiscal Year Final Research Report Summary

Experimental Observation of Cyclotron Superradiance from an Intense Relativistic Electron Beam.

Research Project

Project/Area Number 11680480
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field プラズマ理工学
Research InstitutionKanzawa University

Principal Investigator

KAMADA Keiichi  Kanazawa University, Department of Physics, Assistant Professor., 理学部, 助教授 (90143875)

Co-Investigator(Kenkyū-buntansha) ANDO Ritoku  Kanazawa University, Department of Physics, Assistant Professor., 理学部, 助教授 (80212679)
Project Period (FY) 1999 – 2000
Keywordsintense relativistic electron beam / autoacceleration / superradiance / high-power millimeter wave source / electron cyclotron maser
Research Abstract

An ultrashort pulsed high power electron beam with width of 1 ns and energy of 1.1 MeV was obtained from an intense relativistic electron beam with width of 10 ns and energy of 0.55 MeV using 4-stage autoacceleration.
The ultrashort pulsed electron beam with width of 1 ns was injected into a cylindrical waveguide immersed in a uniform magnetic field. Intense radiated microwaves with narrow frequency spectrum were observed when the group velocity of the electromagnetic wave coincided with the beam electron velocity, while, the microwave spectrum with the beam with width of 10 ns showed many surplus peaks. The particle simulation code KARAT also indicated that the beam width affected the radiation spectrum.
The length of the drift tubes where the beam electrons interacted with the electromagnetic waves was changes. The output power of the radiated microwave increased exponentially with 1 ns and 10 ns beams. The output power of the microwave from 1 ns beam increased more rapidly than that from 10 ns beam. However, that saturated at the length of 40 cm. After 60 cm propagation, the output power from the 1 ns beam was 10 times larger than that from 10 ns beam.
These results suggest that the cyclotron superradiance was observed in the experiment. The dependence of the output power on the beam current should be investigated.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 鎌田啓一 他: "超短パルス大強度電子ビームからの超放射実験"電子情報通信学会技術研究報告書. ED2000-215. 63-70 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Daisuke Hasegawa 他: "Generation of an intense electron beam with a sub-nanosecond duration using multi-stage autoacceleration"Jpn.J.Appl.Phys.. 40巻2B. 944-9* (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Daisuke Hasegawa 他: "Energy enhancement in the two-stage autoacceleration scheme"IEEE Trans.Plasma Sci. 28巻. 2275-2277 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Daisuke Hasegawa 他: "Four-stage autoacceleration for a sub-nanosecond intense relativistic electron beam"IEEE Trans.Plasma Sci.. 28巻. 1648-1652 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Keiichi Kamada 他: "Two-Stage autoacceleration using decreasing length cavities"IEEE Trans.Plasma Sci.. 27巻. 1609-1610 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Kamada, A.Kuraku, D.Hasegawa, C.Y.Lee, R.Ando and M.Masuzaki: "Experimental observation of cyclotron superradiance using an ultrashort pulsed high power electron beam"Technical reports of IEICE(in Japanese). ED2000-215. 63-70 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] D.Hasegawa, K.Kamada, A.Kuraku, R.Ando and M.Masuzaki: "Generation of an Intense electron beam with a sub-nanosecond duration using multi-stage autoacceleration"Jpn.J.Appl.Phys.. Vol.40. 944-948 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] D.Hasegawa, K.Kamada, A.Kuraku, R.Ando and M.Masuzaki: "Energy enhancement in the two-stage autoacceleration scheme"IEEE trans.Plasma Sci.. Vol.28. 2275-2277 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] D.Hasegawa, K.Kamada, K.Shimizu, R.Ando and M.Masuzaki: "Four-stage autoacceleration for a sub-nanosecond intense relativistic electron beam"IEEE trans.Plasma Sci.. Vol.28. 1648-1652 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Kamada, D.Hasegawa, K.Shimizu, R.Ando and M.Masuzaki: "Two-stage autoacceleration using decreasing length cavities"IEEE trans.Plasma Sci.. Vol.27. 1609-1610 (1999)

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

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Published: 2002-03-26  

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