Experimental measurements of the collisional absorption of XUV radiation in warm dense aluminium

B. Kettle 1 T. Dzelzainis 1 S. White 1 L. Li 1 B. Dromey 1 M. Zepf 1 C. Lewis 1 G. Williams 2 S. Künzel 2 M. Fajardo 2 H. Dacasa 3 Ph. Zeitoun 3 A. Rigby 4 G. Gregori 4 C. Spindloe 5 R. Heathcote 5 D. Riley 1
1 Centre for Plasma Physics
2 Inst Super Tecn, GoLP Inst Plasmas & Fusao Nucl
3 LOA - Laboratoire d'optique appliquée
4 Clarendon Lab, Pk Rd, Oxford OX1 3PU, England
5 Cent Laser Facil, Harwell OX11 0QX, Oxon, England
Abstract : The collisional (or free-free) absorption of soft x rays in warm dense aluminium remains an unsolved problem. Competing descriptions of the process exist, two of which we compare to our experimental data here. One of these is based on a weak scattering model, another uses a corrected classical approach. These two models show distinctly different behaviors with temperature. Here we describe experimental evidence for the absorption of 26-eV photons in solid density warm aluminium (T-e approximate to 1 eV). Radiative x-ray heating from palladium-coated CH foils was used to create the warm dense aluminium samples and a laser-driven high-harmonic beam from an argon gas jet provided the probe. The results indicate little or no change in absorption upon heating. This behavior is in agreement with the prediction of the corrected classical approach, although there is not agreement in absolute absorption value. Verifying the correct absorption mechanism is decisive in providing a better understanding of the complex behavior of the warm dense state.
Keywords : MATTER TRANSMISSION X-RAY LASER PHOTOABSORPTION
Document type :
Journal articles
Complete list of metadatas
https://hal-ensta-paris.archives-ouvertes.fr//hal-01400864
Contributor : Pierre Zaparucha <>
Submitted on : Tuesday, November 22, 2016 - 3:42:45 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:03 AM

Links full text

openaccess

Identifiers

Collections

ENSTA | X | X-LOA | ENSTA_LOA | PARISTECH | UNIV-PARIS-SACLAY | X-DEP-PHYS

Citation

B. Kettle, T. Dzelzainis, S. White, L. Li, B. Dromey, et al.. Experimental measurements of the collisional absorption of XUV radiation in warm dense aluminium. Physical Review E , American Physical Society (APS), 2016, 94 (2), ⟨10.1103/PhysRevE.94.023203⟩. ⟨hal-01400864⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

223

Contact

CCSD