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Characterization of a bright, tunable, ultrafast Compton scattering X-ray source

  • F.V. HARTEMANN (a1), A.M. TREMAINE (a1), S.G. ANDERSON (a1), C.P.J. BARTY (a1), S.M. BETTS (a1), R. BOOTH (a1), W.J. BROWN (a1), J.K. CRANE (a1), R.R. CROSS (a1), D.J. GIBSON (a1), D.N. FITTINGHOFF (a1), J. KUBA (a1), G.P. LE SAGE (a1), D.R. SLAUGHTER (a1), A.J. WOOTTON (a1), E.P. HARTOUNI (a1), P.T. SPRINGER (a1), J.B. ROSENZWEIG (a2) and A.K. KERMAN (a3)...

Abstract

The Compton scattering of a terawatt-class, femtosecond laser pulse by a high-brightness, relativistic electron beam has been demonstrated as a viable approach toward compact, tunable sources of bright, femtosecond, hard X-ray flashes. The main focus of this article is a detailed description of such a novel X-ray source, namely the PLEIADES (Picosecond Laser–Electron Inter-Action for the Dynamical Evaluation of Structures) facility at Lawrence Livermore National Laboratory. PLEIADES has produced first light at 70 keV, thus enabling critical applications, such as advanced backlighting for the National Ignition Facility and in situ time-resolved studies of high-Z materials. To date, the electron beam has been focused down to σx = σy = 27 μm rms, at 57 MeV, with 266 pC of charge, a relative energy spread of 0.2%, a normalized horizontal emittance of 3.5 mm·mrad, a normalized vertical emittance of 11 mm·mrad, and a duration of 3 ps rms. The compressed laser pulse energy at focus is 480 mJ, the pulse duration 54 fs Intensity Full Width at Half-Maximum (IFWHM), and the 1/e2 radius 36 μm. Initial X rays produced by head-on collisions between the laser and electron beams at a repetition rate of 10 Hz were captured with a cooled CCD using a CsI scintillator; the peak photon energy was approximately 78 keV, and the observed angular distribution was found to agree very well with three-dimensional codes. The current X-ray dose is 3 × 106 photons per pulse, and the inferred peak brightness exceeds 1015 photons/(mm2 × mrad2 × s × 0.1% bandwidth). Spectral measurements using calibrated foils of variable thickness are consistent with theory. Measurements of the X-ray dose as a function of the delay between the laser and electron beams show a 24-ps full width at half maximum (FWHM) window, as predicted by theory, in contrast with a measured timing jitter of 1.2 ps, which contributes to the stability of the source. In addition, K-edge radiographs of a Ta foil obtained at different electron beam energies clearly demonstrate the γ2-tunability of the source and show very good agreement with the theoretical divergence-angle dependence of the X-ray spectrum. Finally, electron bunch shortening experiments using velocity compression have also been performed and durations as short as 300 fs rms have been observed using coherent transition radiation; the corresponding inferred peak X-ray flux approaches 1019 photons/s.

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Corresponding author

Address correspondence and reprint requests to: F.V. Hartemann, Lawrence Livermore National Laboratory, L-280, P.O. Box 808, Livermore, CA 94551-0808, USA. E-mail: hartemann1@llnl.gov

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Characterization of a bright, tunable, ultrafast Compton scattering X-ray source

  • F.V. HARTEMANN (a1), A.M. TREMAINE (a1), S.G. ANDERSON (a1), C.P.J. BARTY (a1), S.M. BETTS (a1), R. BOOTH (a1), W.J. BROWN (a1), J.K. CRANE (a1), R.R. CROSS (a1), D.J. GIBSON (a1), D.N. FITTINGHOFF (a1), J. KUBA (a1), G.P. LE SAGE (a1), D.R. SLAUGHTER (a1), A.J. WOOTTON (a1), E.P. HARTOUNI (a1), P.T. SPRINGER (a1), J.B. ROSENZWEIG (a2) and A.K. KERMAN (a3)...

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