Single-shot multi-keV X-ray absorption spectroscopy using an ultrashort laser-wakefield accelerator source

0519638 - FZÚ 2020 RIV US eng J - Článek v odborném periodiku
Kettle, B. - Gerstmayr, E. - Streeter, M.J.V. - Albert, F. - Baggott, R.A. - Bourgeois, N. - Cole, J.M. - Dann, S. - Falk, Kateřina - Gonzalez, I.G. - 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.
Single-shot multi-keV X-ray absorption spectroscopy using an ultrashort laser-wakefield accelerator source.
Physical Review Letters. Roč. 123, č. 25 (2019), s. 1-6, č. článku 254801. ISSN 0031-9007. E-ISSN 1079-7114
Institucionální podpora: RVO:68378271
Klíčová slova: femtosecond * scattering * high power lasers * plasma accelerators * X ray absorption near edge structure spectroscopy
Obor OECD: Optics (including laser optics and quantum optics)
Impakt faktor: 8.385, rok: 2019
Způsob publikování: Omezený přístup
https://doi.org/10.1103/physrevlett.123.254801

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 1GeV and a broad divergence of ≈15 mrad FWHM. Betatron oscillations of these electrons generated 1.2 × 106 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.
Trvalý link: http://hdl.handle.net/11104/0304640