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

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

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25 Citations (Scopus)
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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.
Original languageEnglish
Pages (from-to)084201-1/7
JournalPhysical Review Special Topics - Accelerators and Beams
Volume9
Issue number8
DOIs
Publication statusPublished - 2006

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