Session RP1 - Poster Session VIII.
POSTER session, Thursday afternoon, October 30
Fran Hill Southeast Exhibit Hall, ACC
The determination of the charge state distribution (CSD) of highly ionized gold in high-density plasmas (\sim 10^21 cm^-3) is critical for ICF experiments. Predictive calculations of the CSD have produced widely varying results. Previous experiments on NOVA have had some success in guiding the models at 2 keV. Here, CSD’s have been investigated in Hot Halfraum experiments (T_e > 5keV) at OMEGA and HELEN by comparing the n=5-3 and n=4-3 X-ray transitions in Ni-like to Kr-like Au to HULLAC line emission modeling. CSDs at low density (\sim 10^12 cm^-3) and T_e = 2-2.5 keV have been inferred in plasmas created at the Livermore electron beam ion trap (EBIT) facility (Wong, et. al., PRL 90, 235001-1 (2003)). One uncertainty in these CSD measurements is the collisional excitation cross sections. To reduce this uncertainty, some of the relevant n=3-4 and n=3-5 cross sections have been measured at the EBIT facility and are compared with theoretical predictions. This work was performed by the University of California LLNL under the auspices of the DOE under contract W-7405-ENG-48..