Radial bunch compression: Path-length compensation in an rf photoinjector with a curved cathode

M.J. de Loos, S.B. van der Geer, Y.M. Saveliev, V.M. Pavlov, A.J.W. Reitsma, S.M. Wiggins, J. Rodier, T. Garvey, D.A. Jaroszynski

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Electron bunch lengthening due to space-charge forces in state-of-the-art rf photoinjectors limits the minimum bunch length attainable to several hundreds of femtoseconds. Although this can be alleviated by increasing the transverse dimension of the electron bunch, a larger initial radius causes path-length differences in both the rf cavity and in downstream focusing elements. In this paper we show that a curved cathode virtually eliminates these undesired effects. Detailed numerical simulations confirm that significantly shorter bunches are produced by an rf photogun with a curved cathode compared to a flat cathode device. The proposed novel method will be used to provide 100 fs duration electron bunches for injection into a laser-driven plasma wakefield accelerator.
LanguageEnglish
Pages084201-1-084201-7
JournalPhysical Review Special Topics: Accelerators and Beams
Volume9
Issue number8
DOIs
Publication statusPublished - Aug 2006

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cathodes
plasma accelerators
electrons
space charge
injection
cavities
radii
causes
lasers
simulation

Keywords

  • laser-plasma interactions
  • electron beams
  • lasers
  • rf photoinjectors

Cite this

de Loos, M.J. ; van der Geer, S.B. ; Saveliev, Y.M. ; Pavlov, V.M. ; Reitsma, A.J.W. ; Wiggins, S.M. ; Rodier, J. ; Garvey, T. ; Jaroszynski, D.A. / Radial bunch compression: Path-length compensation in an rf photoinjector with a curved cathode. In: Physical Review Special Topics: Accelerators and Beams. 2006 ; Vol. 9, No. 8. pp. 084201-1-084201-7.
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abstract = "Electron bunch lengthening due to space-charge forces in state-of-the-art rf photoinjectors limits the minimum bunch length attainable to several hundreds of femtoseconds. Although this can be alleviated by increasing the transverse dimension of the electron bunch, a larger initial radius causes path-length differences in both the rf cavity and in downstream focusing elements. In this paper we show that a curved cathode virtually eliminates these undesired effects. Detailed numerical simulations confirm that significantly shorter bunches are produced by an rf photogun with a curved cathode compared to a flat cathode device. The proposed novel method will be used to provide 100 fs duration electron bunches for injection into a laser-driven plasma wakefield accelerator.",
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de Loos, MJ, van der Geer, SB, Saveliev, YM, Pavlov, VM, Reitsma, AJW, Wiggins, SM, Rodier, J, Garvey, T & Jaroszynski, DA 2006, 'Radial bunch compression: Path-length compensation in an rf photoinjector with a curved cathode' Physical Review Special Topics: Accelerators and Beams, vol. 9, no. 8, pp. 084201-1-084201-7. https://doi.org/10.1103/PhysRevSTAB.9.084201

Radial bunch compression: Path-length compensation in an rf photoinjector with a curved cathode. / de Loos, M.J.; van der Geer, S.B.; Saveliev, Y.M.; Pavlov, V.M.; Reitsma, A.J.W.; Wiggins, S.M.; Rodier, J.; Garvey, T.; Jaroszynski, D.A.

In: Physical Review Special Topics: Accelerators and Beams, Vol. 9, No. 8, 08.2006, p. 084201-1-084201-7.

Research output: Contribution to journalArticle

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AU - Pavlov, V.M.

AU - Reitsma, A.J.W.

AU - Wiggins, S.M.

AU - Rodier, J.

AU - Garvey, T.

AU - Jaroszynski, D.A.

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KW - lasers

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