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Longitudinal Space Charge Effects in the JLAB IR FEL SRF LINAC.
by R. Evans, R. Walker, G. P. Williams, D. Hardy, D. Douglas, S. Benson, C. Behre, S. Zhang, G. Neil, H. F. Dylla, K. Jordan, J. Preble, M. Shinn, K. Beard, B. Yunn, L. Merminga, G. Biallas, T. Siggins, J. Boyce, A. Grippo, J. Gubeli, C. Hernandez-Garcia ยท 2004
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Observations of energy spread asymmetry when operating the Linac on either side of crest and longitudinal emittance growth have been confirmed by extending PARMELA simulations from the injector to the end of the first SRF Linac module. The asymmetry can be explained by the interaction of the accelerating electric field with that from longitudinal space charge effects within the electron bunch. This can be a major limitation to performance in FEL accelerators.