HTPD 2018

1D 5-μm FWHM spatially resolved high resolution x-ray spectroscopy is needed to diagnose HEDP plasmas with large temperature and density gradients. Magnification is required to overcome the 50-100 μm detector resolution. Experiments with spherical crystals in a sagittally focusing geometry demonstrated ~12 μm resolution. New experiments will attempt to achieve the theoretical limit. To avoid source-size broadening, a modified Johann configuration is being developed, with the source inside the Rowland circle, close to the crystal, and the detector on the Rowland circle. A quasi-toroidal crystal with minor radius varying along the crystal axis [M. Bitter et al., this conf.] will achieve sagittal focusing at all energies. Initial applications are EXAFS experiments on NIF. Proof of principle experiments will be presented. *Performed under the auspices of the U.S. DoE by Princeton Plasma Physics Lab. under contract DE-AC02-09CH11466 and by Lawrence Livermore National Lab. under contract DE-AC52-07NA27344