Spectral Diagnosis of Plasmas with 2-Dimensional Non-Uniformities.
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
A series of investigations concerning new techniques in x-ray spectroscopy of dense plasmas is reported on. Included are two imporvements in the ionization-radiation model used to diagnose experimental spectral data from dense laboratory plasma 1 a detailed model for dielectronic satellite line emission in dense plasmas, 2 an intergration scheme for the time-dependent atomic rate equations used to characterize collisional-radiative plasmas at highly non-equilibrium conditions. The model is then used to study 2-dimensional radiation phenomena in laser-heated plasmas. First, we investigate the effects of neglecting axial photon transport in the plasma blowoff on tracer-dot spectroscopy and subsequent temperature and density determinations. We find that the measured density may be as much as a factor of 2 in error when these effects are neglected, but measured temperatures are fortuitously correct to about 10. Second, laternal inhomgenieties in plasma parameters are studied as they affect the K-shell X-ray spectrum emitted between the critical and ablation surface. A method is proposed to detect these non-uniformities via the techniques of tracer-dot spectroscopy. Author
- Atomic and Molecular Physics and Spectroscopy
- Nuclear Physics and Elementary Particle Physics