title: Demonstration of Single-Shot Picosecond Time-Resolved MeV Electron Imaging Using a Compact Permanent Magnet Quadrupole Based Lens.
abstract: We present the results of an experiment where a short focal length (∼1.3  cm), permanent magnet electron lens is used to image micron-size features (of a metal sample) with a single shot from an ultrahigh brightness picosecond-long 4 MeV electron beam emitted by a radio-frequency photoinjector. Magnification ratios in excess of 30× were obtained using a triplet of compact, small gap (3.5 mm), Halbach-style permanent magnet quadrupoles with nearly 600  T/m field gradients. These results pave the way towards single-shot time-resolved electron microscopy and open new opportunities in the applications of high brightness electron beams.
authors.affiliation: Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA.
authors.forename: D
authors.initials: D
authors.lastname: Cesar
authors.affiliation: Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA.
authors.forename: J
authors.initials: J
authors.lastname: Maxson
authors.affiliation: Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA.
authors.forename: P
authors.initials: P
authors.lastname: Musumeci
authors.affiliation: Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Department of Electrical Engineering, UCLA, Los Angeles, California 90095, USA.
authors.forename: J
authors.initials: J
authors.lastname: Harrison
authors.affiliation: RadiaBeam Technologies, 1717 Stewart Street, Santa Monica, California 90404, USA.
authors.forename: P
authors.initials: P
authors.lastname: Frigola
authors.affiliation: RadiaBeam Technologies, 1717 Stewart Street, Santa Monica, California 90404, USA.
authors.forename: F H
authors.initials: FH
authors.lastname: O'Shea
authors.affiliation: RadiaBeam Technologies, 1717 Stewart Street, Santa Monica, California 90404, USA.
authors.forename: H
authors.initials: H
authors.lastname: To
authors.affiliation: INFN-LNF, Via E. Fermi, 40-00044 Frascati, Rome, Italy.
authors.forename: D
authors.initials: D
authors.lastname: Alesini
authors.affiliation: SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
authors.forename: R K
authors.initials: RK
authors.lastname: Li