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2005 Fiscal Year Final Research Report Summary

Study on Beam Dynamics and Beam Instabilities for a Next Generation Light Source Based on an Energy-Recovery Linac

Research Project

Project/Area Number 15360507
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Nuclear engineering
Research InstitutionJapan Atomic Energy Agency (JAEA)

Principal Investigator

HAJIMA Ryoichi  JAEA, Quantum Beam Science Directorate, 量子ビーム応用研究部門, グループリーダ (30218432)

Co-Investigator(Kenkyū-buntansha) SAWAMURA Masaru  JAEA, Quantum Beam Science Directorate, 量子ビーム応用研究部門, 研究副主幹 (30354905)
NAGAI Ryoji  JAEA, Quantum Beam Science Directorate, 量子ビーム応用研究部門, 研究副主幹 (40354906)
KIKUZAWA Nobuhiro  JAEA, Quantum Beam Science Directorate, 量子ビーム応用研究部門, 研究員 (50354907)
NISHIMORI Nobuyuki  JAEA, Quantum Beam Science Directorate, 量子ビーム応用研究部門, 研究員 (60354908)
NISHITANI Tomohiro  JAEA, Quantum Beam Science Directorate, 量子ビーム応用研究部門, 博士研究員 (40391320)
Project Period (FY) 2003 – 2005
KeywordsEnergy-Recovery Linac / Next Generation Light Source / Superconducting Accelerator / electron beam emittance / coherent radiation / beam instability / free-electron laser / femtosecond pulse
Research Abstract

Energy-recovery linac is a candidate of next-generation X-ray light source, which produces coherent X-rays and femto-second X-rays. Critical issues which determine the performance of ERL light sources have been studied in this project. The issues are (1)beam instabilities due to higher-order modes excited in superconducting cavities, (2)emittance growth due to collective effects through a curved path.
For the HOM instability, we developed a particle tracking simulation code to estimate the threshold current of beam break-up. The result of simulation code has been compared with results from other simulation codes. We have also made an experimental study of HOM instability at JAEA ERL, where the injection beam is perturbed by beam deflector at the same frequency as HOM at the main cavity. We have seen enhancement of HOM signals by the deflected beam.
For the emittance growth in a curved path, we have proposed linear analysis to calculate the emittance growth due to the collective effects in an electron bunch, which are coherent synchrotron radiation and longitudinal space charge force. The linear analysis can be used to find an optimum beam envelope along a curved path such as injection merger and return loop to minimize the emittance growth.

  • Research Products

    (18 results)

All 2006 2005 2004

All Journal Article (18 results)

  • [Journal Article] Optics and Beam Transport in Energy Recovery Linacs2006

    • Author(s)
      R.Hajima
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A557

      Pages: 45-50

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Multiparameter optimization of an ERL injector2006

    • Author(s)
      R.Hajima, R.Nagai
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A557

      Pages: 103-105

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Photocathodes for the energy recovery linacs2006

    • Author(s)
      T.Rao, A.Burrill, X.Y.Chang, J.Smedley, T.Nishitani, C.Hernandez Garcia, M.Poelker, E.Seddon, F.E.Hannon, C.K.Sinclair, J.Lewellen, D.Feldman
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A557

      Pages: 124-130

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Merger designs for ERLs2006

    • Author(s)
      Vladimir N.Litvinenko, Ryoichi Hajima, Dmitry Kayran
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A557

      Pages: 165-175

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Multipass beam breakup in energy recovery linacs2006

    • Author(s)
      E.Pozdeyev, C.Tennant, J.J.Bisognano, M.Sawamura, R.Hajima, T.I.Smith
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A557

      Pages: 176-188

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Overview of CSR codes2006

    • Author(s)
      G.Bassi, T.Agoh, M.Dohlus, L.Giannessi, R.Hajima, A.Kabel, T.Limberg, M.Quattromini
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A557

      Pages: 189-204

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Numerical analysis of volocity bunching for an ERL light source2006

    • Author(s)
      H.Iijima, R.Hajima
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A557

      Pages: 213-215

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Status of RF system for the JAERI energy-recovery linac FEL2006

    • Author(s)
      Masaru Sawamura, Ryoji Nagai
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A557

      Pages: 287-289

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Beam position monitor with HOM couplers2006

    • Author(s)
      Masaru Sawamura, Ryoji Nagai
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A557

      Pages: 328-330

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] R-matrix analysis of the CSR effects in a future ERL light source2006

    • Author(s)
      R.Hajima
    • Journal Title

      Proceedings of Asian Particle Accelerator Conference 2004

      Pages: 125-127

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Numerical analysis of velocity bunching for an ERL light source2006

    • Author(s)
      H.Iijima, R.Hajima
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A557

      Pages: 213-215

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] 会議報告 : エネルギー回路型リニアックに関する国際ワークショップ(ERL-2005)2005

    • Author(s)
      羽島良一, 諏訪田剛
    • Journal Title

      放射光 18

      Pages: 200-201

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] A Report of ERL-2005 Workshop2005

    • Author(s)
      R.Hajima, T.Suwada
    • Journal Title

      Journal of the Japanese Society for Synchrotron Radiation Research 18

      Pages: 200-201

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] ERL 入射合流部におけるエミッタンス増大とその補償2004

    • Author(s)
      R.Hajima
    • Journal Title

      Proceedings of the 1st Annual Meeting of Particle Accelerator Society of Japan and the 29th Linear Accelerator Meeting in Japan

      Pages: 432-434

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] 次世代ERL放射光源用入射器のビームダイナミクス解析2004

    • Author(s)
      R.Hajima, R.Nagai, T.Nishitani
    • Journal Title

      Proceedings of the 1st Annual Meeting of Particle Accelerator Society of Japan and the 29th Linear Accelerator Meeting in Japan

      Pages: 447-449

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Emittance compensation in a return arc of an energy-recovery linac2004

    • Author(s)
      R.Hajima
    • Journal Title

      Nuclear Instruments and Methods in Physics Research A528

      Pages: 335-339

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] EMITTANCE COMPENSATION IN AN ERL MERGER2004

    • Author(s)
      R.Hajima
    • Journal Title

      Proceedings of the 1st Annual Meeting of Particle Accelerator Society of Japan and the 29th Linear Accelerator Meeting in Japan (in Japanese)

      Pages: 432-434

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] STUDY ON BEAM DYNAMICS IN AN ERL INJECTOR2004

    • Author(s)
      R.Hajima, R.Nagai, T.Nishitani
    • Journal Title

      Proceedings of the 1st Annual Meeting of Particle Accelerator Society of Japan and the 29th Linear Accelerator Meeting in Japan (in Japanese)

      Pages: 447-449

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

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Published: 2007-12-13  

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