title: Plasma-wakefield acceleration of an intense positron beam.
abstract: Plasma wakefields are both excited and probed by propagating an intense 28.5 GeV positron beam through a 1.4 m long lithium plasma. The main body of the beam loses energy in exciting this wakefield while positrons in the back of the same beam can be accelerated by the same wakefield as it changes sign. The scaling of energy loss with plasma density as well as the energy gain seen at the highest plasma density is in excellent agreement with simulations.
authors.affiliation: University of California, Los Angeles, California 90095, USA.
authors.forename: B E
authors.initials: BE
authors.lastname: Blue
authors.forename: C E
authors.initials: CE
authors.lastname: Clayton
authors.forename: C L
authors.initials: CL
authors.lastname: O'Connell
authors.forename: F-J
authors.initials: FJ
authors.lastname: Decker
authors.forename: M J
authors.initials: MJ
authors.lastname: Hogan
authors.forename: C
authors.initials: C
authors.lastname: Huang
authors.forename: R
authors.initials: R
authors.lastname: Iverson
authors.forename: C
authors.initials: C
authors.lastname: Joshi
authors.forename: T C
authors.initials: TC
authors.lastname: Katsouleas
authors.forename: W
authors.initials: W
authors.lastname: Lu
authors.forename: K A
authors.initials: KA
authors.lastname: Marsh
authors.forename: W B
authors.initials: WB
authors.lastname: Mori
authors.forename: P
authors.initials: P
authors.lastname: Muggli
authors.forename: R
authors.initials: R
authors.lastname: Siemann
authors.forename: D
authors.initials: D
authors.lastname: Walz