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Kettle, B; Gerstmayr, E; Streeter, M J V; Albert, F; Baggott, R A; Bourgeois, N; Cole, J M; Dann, S; Falk, K; Gallardo González, I; Hussein, A E; Lemos, N; Lopes, N C; Lundh, O; Ma, Y; Rose, S J; Spindloe, C; Symes, D R; Šmíd, M; Thomas, A G R; Watt, R; Mangles, S P D
Physical review letters, 12/2019, Volume: 123, Issue: 25Journal Article
Single-shot absorption measurements have been performed using the multi-keV x rays generated by a laser-wakefield accelerator. A 200 TW laser was used to drive a laser-wakefield accelerator in a mode which produced broadband electron beams with a maximum energy above 1 GeV and a broad divergence of ≈15 mrad FWHM. Betatron oscillations of these electrons generated 1.2±0.2×10^{6} photons/eV in the 5 keV region, with a signal-to-noise ratio of approximately 300∶1. This was sufficient to allow high-resolution x-ray absorption near-edge structure measurements at the K edge of a titanium sample in a single shot. We demonstrate that this source is capable of single-shot, simultaneous measurements of both the electron and ion distributions in matter heated to eV temperatures by comparison with density functional theory simulations. The unique combination of a high-flux, large bandwidth, few femtosecond duration x-ray pulse synchronized to a high-power laser will enable key advances in the study of ultrafast energetic processes such as electron-ion equilibration.
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