Electron beam acceleration and compression for short wavelength FELs

A single pass UV or X-ray FEL will require a low emittance electron beam with high peak current and a beam energy of a few hundred MeV to many GeV. To achieve the necessary peak current and beam energy, the beams must be bunch compressed and accelerated in long transport lines where dispersive and wakefield emittance dilutions are important. In this paper, we will describe the sources and significance of the dilutions during acceleration, bunch compression, and transport through the undulator. In addition, we will discuss sources of jitter as well as possible cancellation techniques.