Single-Shot Multi-keV X-Ray Absorption Spectroscopy Using an Ultrashort Laser-Wakefield Accelerator Source
- Imperial College, London (United Kingdom)
- Lancaster Univ., (United Kingdom)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Science and Technology Facilities Council (STFC), Didcot (United Kingdom)
- Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany); Institute of Physics of the ASCR, Prague (Czech Republic)
- Lund Univ. (Sweden)
- Univ. of Michigan, Ann Arbor, MI (United States)
- Instituto Superior Tecnico, Lisbon (Portugal)
- Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
- Lancaster Univ., (United Kingdom); Univ. of Michigan, Ann Arbor, MI (United States)
We report that 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 GeVand a broad divergence of ≈15 mrad FWHM. Betatron oscillations of these electrons generated 1.2 ± 0.2 x 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. 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.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Fusion Energy Sciences (FES); European Research Council9ERC)
- Grant/Contract Number:
- AC52-07NA27344; 682399; SC0019186
- OSTI ID:
- 1843564
- Report Number(s):
- LLNL-JRNL-820665; 1031707; TRN: US2302288
- Journal Information:
- Physical Review Letters, Vol. 123, Issue 25; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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