Speaker
Description
H1504+65, a bare stellar nucleus, is an unusual white dwarf with a Carbon- and Oxygen-dominated
atmosphere. The composition cannot be explained by current stellar evolution models. The analysis
of the elemental abundance and the improvement of stellar atmospheric models depends heavily on
spectral measurements and accurate spectral data. We used soft x-ray emission from a laser heated
hohlraum to irradiate a foam target and obtained a Carbon-Oxygen plasma emission spectrum with
temperature T=195 000K±10 000K and mass fraction ratio C/O=0.85, similar to that of H1504+65.
We performed a detailed comparison of our spectra with the H1504+65 Chandra spectrum, and do
observe the same O VI emission lines. Moreover, intense ion- and laser beams are complimentary
tools to induce High Energy Density in matter. The development of this field is intimately connected
to technological advances of the field. We will give an overview of the projects in High Energy
Density science that we currently address at Xi’An Jiaotong University [1-3].