Multi-keV X-Ray Conversion Efficiency in Laser-Produced Plasmas
X-ray sources are created at the Nova and Omega laser by irradiating a confined volume of Ar, Xe, or Kr gas. The gas is heated by forty 0.35 {micro}m wavelength, 1-ns square laser beams to produce He-like ions that radiate K-shell emission over mm-sized dimensions. The targets are designed to be ''underdense'', meaning that the initial gas density is lower than the critical density of the laser, n{sub c} {approx} 10{sup 21} cm{sup -3}. The laser energy is primarily absorbed by inverse bremsstrahlung and a supersonic heat wave efficiently ionizes the gas. Results from time-resolved and time-integrated diagnostics over a range of experimental parameters are compared. This work represents an important, new method for development of efficient, large-area, tailored multi-keV x-ray sources.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15002267
- Report Number(s):
- UCRL-JC-149203; TRN: US200410%%56
- Resource Relation:
- Journal Volume: 10; Journal Issue: 5; Conference: 44th Annual Meeting of the Division of Plasma Physics, Orlando, FL (US), 11/11/2002--11/15/2002; Other Information: PBD: 31 Oct 2002
- Country of Publication:
- United States
- Language:
- English
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