High quality single shot diffraction patterns using ultrashort megaelectron volt electron beams from a radio frequency photoinjector.
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.
Musumeci
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Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA.
Moody
J T
JT
Scoby
C M
CM
Gutierrez
M S
MS
Bender
H A
HA
Wilcox
N S
NS