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Title: 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.
Authors:
 [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
OSTI Identifier:
1241967
Report Number(s):
LLNL--TR-685151
TRN: US1600908
DOE Contract Number:
AC52-07NA27344
Resource Type:
Technical Report
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
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