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We describe an experimental concept at the National Ignition Facility forspecifically tailored spherical implosions to compress hydrogen to extremedensities (up to $\sim$800$\times$ solid density, electron number densityn$_e$$\sim$4$\times$10$^{25}$ cm$^{-3}$ ) at moderate temperatures (T$\sim$200eV), i.e., to conditions, which are relevant to the interiors of red dwarfstars. The dense plasma will be probed by laser-generated x-ray radiation ofdifferent photon energy to determine the plasma opacity due to collisional(free-free) absorption and Thomson scattering. The obtained results willbenchmark radiation transport models, which in the case for free-freeabsorption show strong deviations at conditions relevant to red dwarfs. Thisvery first experimental test of free-free opacity models at these extremestates will help to constrain where inside those celestial objects energytransport is dominated by radiation or convection. Moreover, our study willinform models for other important processes in dense plasmas, which are basedon electron-ion collisions, e.g., stopping of swift ions or electron-iontemperature relaxation.

Platform for Probing Radiation Transport Properties of Hydrogen at Conditions Found in the Deep Interiors of Red Dwarfs