title: Measurement of power spectral density of broad-spectrum visible light with heterodyne near field scattering and its scalability to betatron radiation.
abstract: We exploit the speckle field generated by scattering from a colloidal suspension to access both spatial and temporal coherence properties of broadband radiation. By applying the Wiener-Khinchine theorem to the retrieved temporal coherence function, information about the emission spectrum of the source is obtained in good agreement with the results of a grating spectrometer. Experiments have been performed with visible light. We prove more generally that our approach can be considered as a tool for modeling a variety of cases. Here we discuss how to apply such diagnostics to broad-spectrum betatron radiation produced in the laser-driven wakefield accelerator under development at SPARC LAB facility in Frascati.
authors.forename: M
authors.initials: M
authors.lastname: Siano
authors.forename: B
authors.initials: B
authors.lastname: Paroli
authors.forename: E
authors.initials: E
authors.lastname: Chiadroni
authors.forename: M
authors.initials: M
authors.lastname: Ferrario
authors.forename: M A C
authors.initials: MA
authors.lastname: Potenza