In this review I will first discuss beam requirements for ultrafast electron diffraction, in particular the biggest challenge: what is needed for recording diffraction patterns of complex macromolecular crystals in a single, femtosecond shot. Subsequently I will discuss the present state of the art provided by bright photoemission guns, both non-relativistic DC guns and relativistic RF guns, in combination with RF bunch compression. Finally I will go into several more exotic methods that are being developed to achieve an even higher degree of spatial coherence and temporal resolution: sources based on laser plasma acceleration and ultracold sources based on photoionization of laser-cooled gases or on cryo-cooled semiconductors photocathodes.
|Title of host publication||6th International Particle Accelerator Conference 2015 (IPAC '15), 3-8 May 2015, Richmond, Virginia, USA|
|Publication status||Published - 2015|
|Event||6th International Particle Accelerator Conference (IPAC '15), May 3-8, 2015, Richmond, VA, USA - Greater Richmond Convention Center, Richmond, VA, United States|
Duration: 3 May 2015 → 8 May 2015
|Conference||6th International Particle Accelerator Conference (IPAC '15), May 3-8, 2015, Richmond, VA, USA|
|Abbreviated title||IPAC '15|
|Period||3/05/15 → 8/05/15|