Demonstration of Fuel Hot-Spot Pressure in Excess of 50 Gbar for Direct-Drive, Layered Deuterium-Tritium Implosions on OMEGA.

S P Regan, V N Goncharov, I V Igumenshchev, T C Sangster, R Betti, A Bose, T R Boehly, M J Bonino, E M Campbell, D Cao, T J B Collins, R S Craxton, A K Davis, J A Delettrez, D H Edgell, R Epstein, C J Forrest, J A Frenje, D H Froula, M Gatu Johnson, V Yu Glebov, D R Harding, M Hohenberger, S X Hu, D Jacobs-Perkins, R Janezic, M Karasik, R L Keck, J H Kelly, T J Kessler, J P Knauer, T Z Kosc, S J Loucks, J A Marozas, F J Marshall, R L McCrory, P W McKenty, D D Meyerhofer, D T Michel, J F Myatt, S P Obenschain, R D Petrasso, P B Radha, B Rice, M J Rosenberg, A J Schmitt, M J Schmitt, W Seka, W T Shmayda, M J Shoup, A Shvydky, S Skupsky, A A Solodov, C Stoeckl, W Theobald, J Ulreich, M D Wittman, K M Woo, B Yaakobi, J D Zuegel

Physical review letters 2016 Jul 8

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A record fuel hot-spot pressure P_{hs}=56±7 Gbar was inferred from x-ray and nuclear diagnostics for direct-drive inertial confinement fusion cryogenic, layered deuterium-tritium implosions on the 60-beam, 30-kJ, 351-nm OMEGA Laser System. When hydrodynamically scaled to the energy of the National Ignition Facility, these implosions achieved a Lawson parameter ∼60% of the value required for ignition [A. Bose et al., Phys. Rev. E 93, 011201(R) (2016)], similar to indirect-drive implosions [R. Betti et al., Phys. Rev. Lett. 114, 255003 (2015)], and nearly half of the direct-drive ignition-threshold pressure. Relative to symmetric, one-dimensional simulations, the inferred hot-spot pressure is approximately 40% lower. Three-dimensional simulations suggest that low-mode distortion of the hot spot seeded by laser-drive nonuniformity and target-positioning error reduces target performance.

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PMID: 27447511

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