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Title: Diagnosis of warm dense conditions in foil targets heated by intense femtosecond laser pulses using Kα imaging spectroscopy

Warm dense conditions in titanium foils irradiated with intense femtosecond laser pulses are diagnosed using an x-ray imaging spectroscopy technique. The line shapes of radially resolved titanium Kα spectra are measured with a toroidally bent GaAs crystal and an x-ray charge-coupled device. Measured spectra are compared with the K-shell emissions modeled using an atomic kinetics – spectroscopy simulation code. Kα line shapes are strongly affected by warm (5-40 eV) bulk electron temperatures and imply multiple temperature distributions in the targets. Finally, the spatial distribution of temperature is dependent on the target thickness, and a thin target shows an advantage to generate uniform warm dense conditions in a large area.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5] ;  [5] ;  [6] ;  [5] ;  [4] ;  [1] ;  [1] ;  [5] ;  [1] ;  [5] ;  [7] ;  [4]
  1. Gwangju Inst. of Science and Technology (GIST), Gwangju (South Korea)
  2. European X-ray Free-Electron Laser (XFEL), Hamburg (Germany)
  3. Univ. of Texas, Austin, TX (United States). Dept. of Physics
  4. Gwangju Inst. of Science and Technology (GIST), Gwangju (South Korea); Center for Relativistic Laser Science, Inst. for Basic Science (IBS), Gwangju (South Korea)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
  6. Univ. of Michigan, MI (United States). Center for Ultrafast Optical Sciences
  7. Univ. of Michigan, MI (United States). Center for Ultrafast Optical Sciences; Lancaster Univ. (United Kingdom). Dept. of Physics
Publication Date:
Grant/Contract Number:
AC02-76SF00515; IBS-R012-D1
Type:
Accepted Manuscript
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 26; Journal Issue: 5; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 47 OTHER INSTRUMENTATION
OSTI Identifier:
1437353