Details

Autor(en) / Beteiligte

• 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

Titel

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

Ist Teil von

• Physical review letters, 2019-12, Vol.123 (25), p.254801-254801, Article 254801

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2019

Link zum Volltext

Quelle

American Physical Society

Beschreibungen/Notizen

• 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.