COAX: A Temperature Profile Diagnostic for Radiation Waves on OMEGA-60

We have developed COAX [1] to provide spatial temperature profiles of a radiation wave through low density foams as a more detailed constraint for simulations than breakout measurements provide [2]. The COAX platform uses a halfraum to drive radiation down a titanium-laden silicon oxide foam at OMEGA-60 [1,3]. Point-projection X-ray absorption spectroscopy, for temperature, is paired with radiography to capture the developing shock as radiation flow becomes subsonic. Spectroscopic analysis of COAX data determines temperature by comparison to synthetic spectra post-processed from radiation-hydrodynamics simulations [2], with \underline {}$+$22.4$\mu $m spatial resolution and temperature uncertainty of \underline {}$+$ 4-8 eV. \begin{enumerate} \item H. M. Johns, C. L. Fryer, S. R. Wood, et al, submitted to HEDP \item C. Fryer, A. Hungerford, J. Kline, et al, HEDP, \textbf{35}, 2020, 100738 \item D. Capelli, C. A. Charsley-Groffman, R. B. Randolph, High Power Laser Sci. \textbf{5}, (2017) \end{enumerate}