The first part of this topical review provides the reader with a conceptual background sufficient to understand the mechanism of an X-FEL without using any formalism. The discussion is thus accessible to non-specialized scientists from any discipline. Then, we review the present status of selected X-FEL projects throughout the world. Examples of actual experiments are used to illustrate the potential impact of these new, exciting sources at the forefront of photon technology.
Majed Chergui, Malte Oppermann, Jérémy Raymond Jean Maurice Rouxel