PLASMA DIAGNOSTICS USING K-ALPHA SATELLITE EMISSION-SPECTROSCOPY IN LIGHT-ION BEAM FUSION EXPERIMENTS

K-alpha satellite spectroscopy can be a valuable technique for diagnos ing conditions in high energy density plasmas. K-alpha emission lines are produced in intense light ion beam plasma interaction experiments as 2p electrons fill partially open Is shells created by the ion beam. In this paper, we present results from collisional-radiative equilibr ium (CRE) calculations which show how K-<alpha> emission spectroscopy can be used to determine target plasma conditions in intense lithium b eam experiments on Particle Beam Fusion Accelerator-II (PBFA-II) at Sa ndia National Laboratories. In these experiments, 8-10 MeV lithium bea ms with intensities of 1-2 TW/cm(2) irradiate planar multilayer target s containing a thin Al tracer. K-alpha emission spectra are measured u sing an X-ray crystal spectrometer with a resolution of lambda/Delta l ambda similar or equal to 1200. The spectra are analyzed using a CRE m odel in which multilevel (N-L similar to 10(3)) statistical equilibriu m equations are solved self-consistently with the radiation field and beam properties to determine atomic level populations. Atomic level-de pendent fluorescence yields and ion-impact ionization cross sections a re used in computing the emission spectra. We present results showing the sensitivity of the K-alpha emission spectrum to temperature and de nsity of the Al tracer. We also discuss the dependence of measured spe ctra on the X-ray crystal spectral resolution, and how additional diag nostic information could be obtained using multiple tracers of similar atomic number.