CERN Accelerating science

Article
Title	Longitudinal Space Charge Effects in the JLAB IR FEL SRF Linac
Author(s)	Hernandez-Garcia, Carlos ; Beard, Kevin ; Behre, Chris ; Benson, S V ; Herman-Biallas, George ; Boyce, James ; Douglas, David ; Dylla, Fred ; Evans, Richard ; Grippo, A ; Gubeli, Joe ; Hardy, David ; Jordan, Kevin ; Merminga, Lia ; Neil, George ; Preble, Joe ; Shinn, Michelle D ; Siggins, Tim ; Walker, Richard ; Williams, Gwyn ; Yunn, Byung ; Zhang, Shukui
Affiliation	(Jefferson Lab, Newport News, Virginia)
Publication	2004
In:	26th International Free Electron Laser Conference and 11th FEL User Workshop 2004, Trieste, Italy, 29 Aug - 3 Sep 2004, pp.e-proc. TUBOS02
Subject category	Accelerators and Storage Rings
Abstract	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.