Abstract: This paper presents the results of simulations for the photoinjector Radio Frequency (RF) cavities of the 1 kW visible FEL currently under construction at the FEL Boeing laboratory in Seattle (WA). The simulations were performed using PARMELA, a particle 'pusher' code developed at Los Alamos National Laboratory, and the pic code ARGUS developed at S.A.I.C. The results indicate that, for the system under consideration, at low charge (less than 5.0 nC) the agreement between the codes is good. The space charge effects are incompletely accounted by PARMELA at charge (greater than 5.0 nC). The results of this work clearly establish the region of applicability of the PARMELA code for photo-injector cavities of the 1 kW visible FEL. !9
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