title: Coherence-based transverse measurement of synchrotron x-ray radiation from relativistic laser-plasma interaction and laser-accelerated electrons.
abstract: We observe Fresnel edge diffraction of the x-ray beam generated by the relativistic interaction of a high-intensity laser pulse with He gas. The observed diffraction at center energy 4.5 keV agrees with Gaussian incoherent source profile of full-width-half-maximum (FWHM) < 8 microm. Analysis indicates this corresponds to an upper limit on the transverse profile of laser-accelerated electrons within the plasma in agreement with three-dimensional, particle-in-cell results (FWHM = 4 microm).
authors.affiliation: Laboratoire d'Optique Appliquée, ENSTA, CNRS UMR7639, Ecole Polytechnique, Chemin de la Hunière, 91761 Palaiseau, France. rahul.shah@ensta.fr
authors.forename: R C
authors.initials: RC
authors.lastname: Shah
authors.forename: F
authors.initials: F
authors.lastname: Albert
authors.forename: K
authors.initials: K
authors.lastname: Ta Phuoc
authors.forename: O
authors.initials: O
authors.lastname: Shevchenko
authors.forename: D
authors.initials: D
authors.lastname: Boschetto
authors.forename: A
authors.initials: A
authors.lastname: Pukhov
authors.forename: S
authors.initials: S
authors.lastname: Kiselev
authors.forename: F
authors.initials: F
authors.lastname: Burgy
authors.forename: J-P
authors.initials: JP
authors.lastname: Rousseau
authors.forename: A
authors.initials: A
authors.lastname: Rousse