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Regan, S. P.; Sangster, T. C.; Meyerhofer, D. D.; Anderson, K.; Betti, R.; Boehly, T. R.; Collins, T. J. B.; Craxton, R. S.; Delettrez, J. A.; Epstein, R.; Gotchev, O. V.; Glebov, V. Yu.; Goncharov, V. N.; Harding, D. R.; Jaanimagi, P. A.; Knauer, J. P.; Loucks, S. J.; Lund, L. D.; Marozas, J. A.; Marshall, F. J.; Mccrory, R. L.; Mckenty, P. W.; Morse, S. F. B.; Radha, P. B.; Seka, W.; Skupsky, S.; Sawada, H.; Smalyuk, V. A.; Soures, J. M.; Stoeckl, C.; Yaakobi, B.; Frenje, J. A.; Li, C. K.; Petrasso, R. D.; Séguin, F. H.

Direct-drive inertial confinement fusion implosions on omega. (English) Zbl 1132.85330

Astrophys. Space Sci. 298, No. 1-2, 227-233 (2005).
Summary: Direct-drive inertial confinement fusion (ICF) creates extreme states of matter. In current direct-drive cryogenic target implosions on the 60-beam OMEGA laser system, the compressed target has a measured pressure of 5 Gbar. These targets are hydrodynamically scaled from ignition targets for the National Ignition Facility. The ignition targets are predicted to have peak pressures of 3 Tbar after the target ignites. ICF target acceleration and deceleration are realized when hot, low-density plasma pushes against cold, high-density plasma, making the target implosion inherently susceptible to the Rayleigh-Taylor hydrodynamic instability (RTI). The unstable RTI growth causes mixing of cold, high-density shell plasma with the low-density, hot-spot plasma and reduces the primary neutron yield of the implosion. The strategy to control the RTI growth is to reduce the seeds (e.g., laser imprint and target-surface roughness) and the growth rates of the dominant modes. This paper reports on our recent experiments, progress in validating the hydrodynamics codes that are used to design future high-gain cryogenic DT targets, and techniques to improve target performance. A brief description is given of a new high energy petawatt laser-OMEGA EP (extended performance)-that is being added to the OMEGA compression facility.

MSC:

85A05 Galactic and stellar dynamics
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