Spectral Diagnosis of Plasmas with 2-Dimensional Non-Uniformities.
Abstract
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 18, 1983
- Accession Number
- ADA125755
Entities
People
- D. Duston
- Jack F. Davis
Organizations
- United States Naval Research Laboratory