ABSORPTION EXPERIMENTS ON X-RAY-HEATED MID-Z CONSTRAINED SAMPLES

Citation
Ts. Perry et al., ABSORPTION EXPERIMENTS ON X-RAY-HEATED MID-Z CONSTRAINED SAMPLES, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 54(5), 1996, pp. 5617-5631
Citations number
38
Categorie Soggetti
Physycs, Mathematical","Phsycs, Fluid & Plasmas
ISSN journal
1063651X
Volume
54
Issue
5
Year of publication
1996
Pages
5617 - 5631
Database
ISI
SICI code
1063-651X(1996)54:5<5617:AEOXMC>2.0.ZU;2-L
Abstract
Results of a niobium absorption experiment are presented that represen t a major step in the development of techniques necessary for the quan titative characterization of hot, dense matter. The general requiremen ts for performing quantitative analyses of absorption spectra are disc ussed. Hydrodynamic simulations are used to illustrate the behavior of tamped x-ray-heated matter and to indicate potential two-dimensional problems inherent in the technique. The absorption spectrum of a low-Z material, in this case aluminum, mixed with niobium provides a temper ature diagnostic, which together with radiography as a density diagnos tic fully characterizes the sample. A discussion is presented of opaci ty calculations and a comparison to the measurements is given that ill ustrates the need for experiments to provide a critical test of theory . The experimental technique is placed in context with a review of pre vious measurements using absorption spectroscopy to probe hot, dense m atter. It is shown that the overall experimental concepts, although un derstood, were not always achieved in previous experiments.