title: Deducing the electron-beam diameter in a laser-plasma accelerator using x-ray betatron radiation.
abstract: We investigate the properties of a laser-plasma electron accelerator as a bright source of keV x-ray radiation. During the interaction, the electrons undergo betatron oscillations and from the carefully measured x-ray spectrum the oscillation amplitude of the electrons can be deduced which decreases with increasing electron energies. From the oscillation amplitude and the independently measured x-ray source size of (1.8±0.3) μm we are able to estimate the electron bunch diameter to be (1.6±0.3) μm.
authors.affiliation: Institut für Optik und Quantenelektronik, Friedrich-Schiller Universität Jena, Jena, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Schnell
authors.forename: Alexander
authors.initials: A
authors.lastname: Sävert
authors.forename: Björn
authors.initials: B
authors.lastname: Landgraf
authors.forename: Maria
authors.initials: M
authors.lastname: Reuter
authors.forename: Maria
authors.initials: M
authors.lastname: Nicolai
authors.forename: Oliver
authors.initials: O
authors.lastname: Jäckel
authors.forename: Christian
authors.initials: C
authors.lastname: Peth
authors.forename: Tobias
authors.initials: T
authors.lastname: Thiele
authors.forename: Oliver
authors.initials: O
authors.lastname: Jansen
authors.forename: Alexander
authors.initials: A
authors.lastname: Pukhov
authors.forename: Oswald
authors.initials: O
authors.lastname: Willi
authors.forename: Malte C
authors.initials: MC
authors.lastname: Kaluza
authors.forename: Christian
authors.initials: C
authors.lastname: Spielmann
mesh_terms: D004583:Electrons; D007834:Lasers; D010315:Particle Accelerators; D012542:Scattering, Radiation; D014965:X-Rays