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Creation of hot dense matter in short-pulse laser-plasma interaction with tamped titanium foils

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Author(s)

  • S. N. Chen
  • G. Gregori
  • P. K. Patel
  • H. K. Chung
  • R. G. Evans
  • R. R. Freeman
  • E. Garcia Saiz
  • S. H. Glenzer
  • S. B. Hansen
  • F. Y. Khattak
  • J. A. King
  • A. J. Mackinnon
  • M. M. Notley
  • J. R. Pasley
  • D. Riley
  • R. B. Stephens
  • R. L. Weber
  • S. C. Wilks
  • F. N. Beg

Department/unit(s)

Publication details

JournalPhysics of Plasmas
DatePublished - 19 Nov 2007
Issue number10
Volume14
Original languageEnglish

Abstract

Dense titanium plasma has been heated to an electron temperature up to 1300 eV with a 100 TW, high intensity short-pulse laser. The experiments were conducted using Ti foils (5 μm thick) sandwiched between layers of either aluminum (1 or 2 μm thick) or plastic (2 μm thick) to prevent the effects of prepulse. Targets of two different sizes, i.e., 250 × 250 μm 2 and 1×1 mm2 were used. Spectral measurements of the Ti inner-shell emission, in the region between 4 and 5 keV, were taken from, the front-side (i.e., the laser illuminated side) of the target. The data show large shifts in the Kα emission from open-shell ions, suggesting bulk heating of the sample at near solid density, which was largest for reduced mass targets. Comparison with collisional radiative and 2D radiation hydrodynamics codes indicates a peak temperature of Te,peak= 1300 eV of solid titanium plasma in ∼0.2 μm thin layer. Higher bulk temperature (T e,bulk=100 eV) for aluminum tamped compared to CH tamped targets (Te,bulk=40 eV) was observed. A possible explanation for this difference is described whereby scattering due to the nuclear charge of the tamping material leads to modified electron transport behavior.

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