Single-Shot Multi-keV X-Ray Absorption Spectroscopy Using an Ultrashort Laser-Wakefield Accelerator Source

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

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±0.2×106 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.

Detaljer

Författare
  • B. Kettle
  • E. Gerstmayr
  • M. J.V. Streeter
  • F. Albert
  • R. A. Baggott
  • N. Bourgeois
  • J. M. Cole
  • S. Dann
  • K. Falk
  • I. Gallardo González
  • A. E. Hussein
  • N. Lemos
  • N. C. Lopes
  • Y. Ma
  • S. J. Rose
  • C. Spindloe
  • D. R. Symes
  • M. Šmíd
  • A. G.R. Thomas
  • R. Watt
  • S. P.D. Mangles
Enheter & grupper
Externa organisationer
  • Imperial College London
  • Lancaster University
  • Lawrence Livermore National Laboratory
  • Rutherford Appleton Laboratory
  • Helmholtz-Zentrum Dresden-Rossendorf
  • Fyzikální ústav AV ČR, v. v. i.
  • Dresden University of Technology
  • University of Michigan
  • Lisboa
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Fusion, plasma och rymdfysik
  • Acceleratorfysik och instrumentering
Originalspråkengelska
Artikelnummer254801
TidskriftPhysical Review Letters
Volym123
Utgåva nummer25
StatusPublished - 2019
PublikationskategoriForskning
Peer review utfördJa