Some Thoughts on the Role of non-LTE Physics in ICF
An effort to develop sub-critical-density high-Z metal-doped and pure metal foams as laser-driven x-ray sources is described. The main idea is that the laser beams preferentially heat the electrons, and if the plasma is sufficiently low density so that the heating rate is greater than the equilibration rate via electron-ion collisions, then the electron temperature in the plasma is much greater than the ion temperature as long as the laser is on. In such a situation the plasma is not in local thermal equilibrium (LTE), it heats supersonically and volumetrically, and the conversion efficiency of laser beam energy to multi-keV L-shell and K-shell radiation is much higher than what it would be in LTE plasma.
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- Resource Type:
- Technical Report
- Research Org:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
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- Country of Publication:
- United States
- 70 PLASMA PHYSICS AND FUSION; INERTIAL CONFINEMENT; LASER-RADIATION HEATING; LASER-PRODUCED PLASMA; PLASMA DENSITY; METALS; ELECTRONS; FOAMS; DOPED MATERIALS; K SHELL; KEV RANGE; L SHELL; X-RAY SOURCES; ELECTRON TEMPERATURE; HEATING RATE; ION TEMPERATURE; CONVERSION; EFFICIENCY
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