Improvements to the NIF opacity platform

National Ignition Facility (NIF) experiments to measure the x-ray opacity of elements important to the flow of energy in astrophysical systems and other high energy density plasma have been underway for a number of years. In the past year significant improvements have been made to the platform to reduce backgrounds, increase signal strength, expand the spectral coverage of the spectrometer, and increase the range of temperatures and densities over which the measurements can be taken. This presentation will describe these improvements and show the most recent data from experiments on oxygen and iron opacities. This work was performed under the U.S. Department of Energy LANL contract 89233218CNA000001, LLNL Contract No. DE-AC52-07NA27344, Sandia Contract No. DE-AC04-94AL85000, NNSS Contract No. DE-AC52-06NA25946, and Unversity of Texas Contract No. DE-NA0003843.