Gas-filled Rugby hohlraum energetics and implosions experiments on OMEGA

Recent experiments [1,2] have validated the x-ray drive enhancement provided by \textit{rugby-shaped hohlraums} over cylinders in the indirect drive (ID) approach to inertial confinement fusion (ICF). This class of hohlraum is the baseline design for the Laser M\'{e}gajoule program, is also applicable to the National Ignition Facility and could therefore benefit ID Inertial Fusion Energy studies. We have carried out a serie of energetics and implosions experiments with OMEGA ``scale 1'' rugby hohlraums [1,2]. For empty hohlraums these experiments provide complementary measurements of backscattered light along 42\r{ } cone, as well as detailed drive history. In the case of gas-filled rugby hohlraums we have also study implosion performance (symmetry, yield, bangtime, hotspot spectra...) using a high contrast shaped pulse leading to a different implosion regime and for a range of capsule convergence ratios. These results will be compared with FCI2 hydrocodes calculations and future experimental campaigns will be suggested. \\[4pt] [1] F. Philippe \textit{et al}., Phys. Rev. Lett. \textbf{104}, 035004 (2010). \\[0pt] [2] H. Robey \textit{et al., }Phys. Plasnas \textbf{17}, 056313 (2010).