title: Generation and characterization of electron bunches with ramped current profiles in a dual-frequency superconducting linear accelerator.
abstract: We report on the successful experimental generation of electron bunches with ramped current profiles. The technique relies on impressing nonlinear correlations in the longitudinal phase space using a superconducing radio frequency linear accelerator operating at two frequencies and a current-enhancing dispersive section. The produced ~700-MeV bunches have peak currents of the order of a kilo-Ampère. Data taken for various accelerator settings demonstrate the versatility of the method and, in particular, its ability to produce current profiles that have a quasilinear dependency on the longitudinal (temporal) coordinate. The measured bunch parameters are shown, via numerical simulations, to produce gigavolt-per-meter peak accelerating electric fields with transformer ratios larger than 2 in dielectric-lined waveguides.
authors.affiliation: Northern Illinois Center for Accelerator & Detector Development and Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA.
authors.forename: P
authors.initials: P
authors.lastname: Piot
authors.forename: C
authors.initials: C
authors.lastname: Behrens
authors.forename: C
authors.initials: C
authors.lastname: Gerth
authors.forename: M
authors.initials: M
authors.lastname: Dohlus
authors.forename: F
authors.initials: F
authors.lastname: Lemery
authors.forename: D
authors.initials: D
authors.lastname: Mihalcea
authors.forename: P
authors.initials: P
authors.lastname: Stoltz
authors.forename: M
authors.initials: M
authors.lastname: Vogt
mesh_terms: D003198:Computer Simulation; D004560:Electricity; D004583:Electrons; D007834:Lasers; D017711:Nonlinear Dynamics; D010315:Particle Accelerators