title: High quality single shot diffraction patterns using ultrashort megaelectron volt electron beams from a radio frequency photoinjector.
abstract: Single shot diffraction patterns using a 250-fs-long electron beam have been obtained at the UCLA Pegasus laboratory. High quality images with spatial resolution sufficient to distinguish closely spaced peaks in the Debye-Scherrer ring pattern have been recorded by scattering the 1.6 pC 3.5 MeV electron beam generated in the rf photoinjector off a 100-nm-thick Au foil. Dark current and high emittance particles are removed from the beam before sending it onto the diffraction target using a 1 mm diameter collimating hole. These results open the door to the study of irreversible phase transformations by single shot MeV electron diffraction.
authors.affiliation: Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA.
authors.forename: P
authors.initials: P
authors.lastname: Musumeci
authors.forename: J T
authors.initials: JT
authors.lastname: Moody
authors.forename: C M
authors.initials: CM
authors.lastname: Scoby
authors.forename: M S
authors.initials: MS
authors.lastname: Gutierrez
authors.forename: H A
authors.initials: HA
authors.lastname: Bender
authors.forename: N S
authors.initials: NS
authors.lastname: Wilcox