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Controlled Betatron X-Ray Radiation from Tunable Optically Injected Electrons

Abstract : The features of Betatron x-ray emission produced in a laser-plasma accelerator are closely linked to the properties of the relativistic electrons which are at the origin of the radiation. While in interaction regimes explored previously the source was by nature unstable, following the fluctuations of the electron beam, we demonstrate in this Letter the possibility to generate x-ray Betatron radiation with controlled and reproducible features, allowing fine studies of its properties. To do so, Betatron radiation is produced using monoenergetic electrons with tunable energies from a laser-plasma accelerator with colliding pulse injection [J. Faure et al., Nature (London) 444, 737 (2006)]. The presented study provides evidence of the correlations between electrons and x-rays, and the obtained results open significant perspectives toward the production of a stable and controlled femtosecond Betatron x-ray source in the keV range.
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Sébastien Corde, Kim Ta Phuoc, R Fitour, Jérôme Faure, A Tafzi, et al.. Controlled Betatron X-Ray Radiation from Tunable Optically Injected Electrons. Physical Review Letters, American Physical Society, 2011, 107, pp.255003. ⟨10.1103/PhysRevLett.107.255003⟩. ⟨hal-01172308⟩

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