An integrated traveling-wave photoinjector

Integrated photoinjectors have the potential to provide compact, low cost, high brightness electron beams, and are attractive for scaling to frequencies beyond S-band. Traditionally, they have been built as standing-wave devices. We are developing a novel high-brightness electron source that couples a two-cell standing wave cavity directly to a multi-cell traveling-wave structure. This configuration offers a number of advantages over the split standing-wave systems, most notably the almost complete removal of the reflected RF transient, and the absence of the bunch lengthening that occurs in the drift section of split systems. We will discuss these and other advantages, as well as provide results of our beam dynamics study.