  Dalian Coherent Light Source will use a 300MeV LINAC to produce fully
coherent photon pulses in the wavelength range between 150-50nm by high gain
harmonic generation free electron laser (FEL) scheme. To generate stable FEL
pulses, stringent tolerance budget is required for the LINAC output parameters,
such as the mean beam energy stability, electron bunch arrival time jitter,
peak current variation and the transverse beam position offset. In order to
provide guidance for the design of the Dalian Coherent Light Source, in this
paper, the sensitivity of FEL pulse energy fluctuation to various error sources
of the electron bunch was performed using intensive start-to-end FEL
simulations.
