Phys. Rev. ST Accel. Beams 9, 084201 (2006) [7 pages]Radial bunch compression: Path-length compensation in an rf photoinjector with a curved cathode
M. J. de Loos1,2 *, S. B. van der Geer1, Y. M. Saveliev2, V. M. Pavlov2, A. J. W. Reitsma2, S. M. Wiggins3,2, J. Rodier4, T. Garvey4, and D. A. Jaroszynski2 † Received 9 June 2006; published 25 August 2006 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. ©2006 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevSTAB.9.084201
* Electronic address: mloos@pulsar.nl
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