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Efficient multi-keV underdense laser-produced plasma radiators.

C A Back1, J Grun, C Decker

  • 1Lawrence Livermore National Laboratory, L-21, P.O. Box 808, Livermore, California 94551, USA.

Physical Review Letters
|January 22, 2002
PubMed
Summary
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Novel x-ray sources using supersonic xenon gas jets achieve 10% laser-to-hard x-ray conversion efficiency. This breakthrough offers improved flux for advanced material testing and backlighting applications.

Area of Science:

  • Plasma Physics
  • X-ray Generation
  • Laser-Plasma Interactions

Background:

  • Developing efficient high-energy X-ray sources is crucial for scientific research and industrial applications.
  • Traditional methods often suffer from low energy conversion efficiencies and limited hard X-ray production.

Purpose of the Study:

  • To create novel, efficient X-ray sources utilizing supersonic gas jets.
  • To enhance the production of hard X-rays with improved laser energy conversion efficiency.

Main Methods:

  • Supersonic heating of a large volume of Xenon (Xe) gas.
  • Laser-induced bleaching wave to rapidly ionize the gas and create plasma.
  • Measurement of laser energy conversion into L-shell radiation (4-7 keV).

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Main Results:

  • Achieved approximately 10% conversion efficiency of laser energy into L-shell radiation (4-7 keV).
  • This efficiency is an order of magnitude higher than that from solid disk targets.
  • Reduced energy loss to kinetic energy and sub-keV X-rays, improving hard X-ray yield.

Conclusions:

  • Supersonic Xe gas jets provide a highly efficient method for generating hard X-rays.
  • The high flux achieved enables new possibilities for material testing and X-ray backlighting.
  • This scalable approach is well-suited for future high-powered laser systems.