Experimental Characterization of a Strongly Coupled Solid Density Plasma Generated in a Short-pulse Laser Target Interaction
✍ Scribed by G. Gregori; S. B. Hansen; R. Clarke; R. Heathcote; M. H. Key; J. King; R. I. Klein; N. Izumi; A. J. Mackinnon; S. J. Moon; H.-S. Park; J. Pasley; N. Patel; P. K. Patel; B. A. Remington; D. D. Ryutov; R. Shepherd; R. A. Snavely; S. C. Wilks; B. B. Zhang; S. H. Glenzer
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 529 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0005-8025
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✦ Synopsis
Abstract
We have measured high resolution copper K__α__ spectra from a picosecond high intensity laser produced plasma. By fitting the shape of the experimental spectra with a self‐consistent‐field model which includes all the relevant line shifts from multiply ionized atoms, we are able to infer time and spatially averaged electron temperatures (T~e~) and ionization state (Z) in the foil. Our results show increasing values for T~e~ and Z when the overall mass of the target is reduced. In particular, we measure temperatures in excess of 200 eV with Z ∼ 13‐14. For these conditions the ion‐ion coupling constant is Γ~ii~ ∼ 8‐9, thus suggesting the achievement of a strongly coupled plasma regime. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)