H Division Materials Physics. Quarterly report, July-September 1983. [ATHEMATICAL MODELS; PETN; COMPUTER CALCULATIONS; HYDRODYNAMIC MODEL; LASER-PRODUCED PLASMA; HYDRODYNAMICS; SHEAR; SOLIDS; STRESSES; WAVE PROPAGATION]
- ed.
H Division has been developing accurate statistical-mechanical models of explosive detonation products which combine molecular physics, accurate liquid theory and multicomponent chemical equilibria. This theory has been applied to the explosive PETN, and good agreement with experiment is obtained for the detonation velocity. Residual discrepancies between theory and experiment suggest that phase separation and chemical kinetics effects are significant. Line emission spectroscopy has proved very useful as a technique for determining the temperature and density of laboratory plasmas. Thorough analysis of these plasmas requires large codes which combine hydrodynamics, radiation transport and atomic physics. Because such codes are very complex and difficult to use, we have instead developed a fast, accurate atomic physics code which synthesizes K-shell spectra at arbitrary temperatures and densities. The code makes use of calculated populations of H-, He-, and Li-like states, then computes lineshapes, and combines these into a synthetic spectrum. The method has been applied to laser-produced and Z-pinch plasmas. The plasma temperatures and densities have been efficiently obtained by fitting the model spectrum to the experimental one. In shockwave experiments on solids it has been traditional to ignore material strength when reducing shock data to a pressure-volume-energy constitutive model. Recent experiments, however, have shown that strength may be non-negligible, even at large shock stresses. We have used these new data to compute the shear stress and thence the true pressure along the shock Hugoniot of beryllium. We find that the pressure is 1.5% below the measured stress in Be at 35 GPa. Further work is needed to determine the importance of this difference for hydrodynamic simulations.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5248762
- Report Number(s):
- UCID-18574-83-3; ON: DE84007789
- Resource Relation:
- Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
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BERYLLIUM
SHOCK WAVES
ALKALINE EARTH METALS
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