title: Transmission of megawatt relativistic electron beams through millimeter apertures.
abstract: High-power, relativistic electron beams from energy-recovering linacs have great potential to realize new experimental paradigms for pioneering innovation in fundamental and applied research. A major design consideration for this new generation of experimental capabilities is the understanding of the halo associated with these bright, intense beams. In this Letter, we report on measurements performed using the 100 MeV, 430 kW cw electron beam from the energy-recovering linac at the Jefferson Laboratory's Free Electron Laser facility as it traversed a set of small apertures in a 127 mm long aluminum block. Thermal measurements of the block together with neutron measurements near the beam-target interaction point yielded a consistent understanding of the beam losses. These were determined to be 3 ppm through a 2 mm diameter aperture and were maintained during a 7 h continuous run.
authors.affiliation: Department of Physics, Arizona State University, Tempe, Arizona 85287, USA.
authors.forename: R
authors.initials: R
authors.lastname: Alarcon
authors.forename: S
authors.initials: S
authors.lastname: Balascuta
authors.forename: S V
authors.initials: SV
authors.lastname: Benson
authors.forename: W
authors.initials: W
authors.lastname: Bertozzi
authors.forename: J R
authors.initials: JR
authors.lastname: Boyce
authors.forename: R
authors.initials: R
authors.lastname: Cowan
authors.forename: D
authors.initials: D
authors.lastname: Douglas
authors.forename: P
authors.initials: P
authors.lastname: Evtushenko
authors.forename: P
authors.initials: P
authors.lastname: Fisher
authors.forename: E
authors.initials: E
authors.lastname: Ihloff
authors.forename: N
authors.initials: N
authors.lastname: Kalantarians
authors.forename: A
authors.initials: A
authors.lastname: Kelleher
authors.forename: R
authors.initials: R
authors.lastname: Legg
authors.forename: R G
authors.initials: RG
authors.lastname: Milner
authors.forename: G R
authors.initials: GR
authors.lastname: Neil
authors.forename: L
authors.initials: L
authors.lastname: Ou
authors.forename: B
authors.initials: B
authors.lastname: Schmookler
authors.forename: C
authors.initials: C
authors.lastname: Tennant
authors.forename: C
authors.initials: C
authors.lastname: Tschalär
authors.forename: G P
authors.initials: GP
authors.lastname: Williams
authors.forename: S
authors.initials: S
authors.lastname: Zhang