Understanding temperature distribution in ICF hot-spots with X-ray diagnostics of disparate spectral ranges*

H. G. Rinderknecht, R. Epstein, D. Thorn, T. E. Weber\newline X-ray diagnostics for the electron temperature $T_e$ in ICF implosions are currently being developed. We demonstrate for the first time that the X-ray diagnostics also allow constraining the Te spatial profile in a realistic hot-spot. A series of Omega implosions have been performed with both soft (3-6 keV) and hard (20-30 keV) X-ray diagnostics employed simultaneously. The apparent temperatures inferred from the respective data have been found to differ by a factor of about 2. This reflects the fact that the higher energy photons are produced closer to the center of the hot-spot, thus enabling us to quantify the difference between peak and peripheral temperatures in the fusion fuel.