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

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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M. J. de Loos, S. B. van der Geer, Y. M. Saveliev, V. M. Pavlov, A. J. W. Reitsma, et al.. Radial bunch compression: Path-length compensation in an rf photoinjector with a curved cathode. Physical Review Special Topics - Accelerators and Beams, 2006, 9, pp.084201. ⟨10.1103/PhysRevSTAB.9.084201⟩. ⟨in2p3-00123978⟩

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