B. Yaakobi

Simulations and measurements of hot-electron generation driven by the multibeam two-plasmon-decay instability

R. K. Follett, J. F. Myatt, J. G. Shaw, A. A. Solodov et autres

Multibeam experiments relevant to direct-drive inertial confinement fusion show the importance of nonlinear saturation mechanisms in the common-wave two-plasmon-decay (TPD) instability. Planar-target experiments on the OMEGA laser used hard x-ray measurements to study the influence of the linear common-wave growth rate on …

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Systematic Fuel Cavity Asymmetries in Directly Driven Inertial Confinement Fusion Implosions

Rahul Shah, B. M. Haines, F. J. Wysocki, J.F. Benage et autres

We present narrow-band self-emission x-ray images from a titanium tracer layer placed at the fuel-shell interface in 60-laser-beam implosion experiments at the OMEGA facility. The images are acquired during deceleration with inferred convergences of ∼9-14. Novel here is that a systematically observed …

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Measurements of hot-electron temperature in laser-irradiated plasmas

A. A. Solodov, B. Yaakobi, D. H. Edgell, R. K. Follett et autres

In a recently published work [Yaakobi et al., Phys. Plasmas 19, 012704 (2012)] we reported on measuring the total energy of hot electrons produced by the interaction of a nanosecond laser with planar CH-coated molybdenum targets, using the Mo Kα emission. The …

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Progress in Cryogenic Target Implosions on OMEGA

R. L. McCrory, D. D. Meyerhofer, R. Betti, T. R. Boehly et autres

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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 et autres

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, …

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Demonstrating ignition hydrodynamic equivalence in direct-drive cryogenic implosions on OMEGA

V. N. Goncharov, S. P. Regan, T. C. Sangster, R. Betti et autres

Achieving ignition in a direct-drive cryogenic implosion at the National Ignition Facility (NIF) requires reaching central stagnation pressures in excess of 100 Gbar, which is a factor of 3 to 4 less than what is required for indirect-drive designs. The OMEGA Laser …

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Two-Plasmon Decay Mitigation in Direct-Drive Inertial-Confinement-Fusion Experiments Using Multilayer Targets

R. K. Follett, J. A. Delettrez, D. H. Edgell, V. N. Goncharov et autres

Multilayer direct-drive inertial-confinement-fusion targets are shown to significantly reduce two-plasmon decay (TPD) driven hot-electron production while maintaining high hydrodynamic efficiency. Implosion experiments on the OMEGA laser used targets with silicon layered between an inner beryllium and outer silicon-doped plastic ablator. A factor-of-5 …

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Spherical strong-shock generation for shock-ignition inertial fusion

W. Theobald, R. Nora, W. Seka, M. Lafon et autres

Recent experiments on the Laboratory for Laser Energetics' OMEGA laser have been carried out to produce strong shocks in solid spherical targets with direct laser illumination. The shocks are launched at pressures of several hundred Mbars and reach Gbar upon convergence. The …

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Polar-direct-drive experiments on the National Ignition Facilitya)

M. Hohenberger, P. B. Radha, J. F. Myatt, S. Le Pape et autres

To support direct-drive inertial confinement fusion experiments at the National Ignition Facility (NIF) [G. H. Miller, E. I. Moses, and C. R. Wuest, Opt. Eng. 43, 2841 (2004)] in its indirect-drive beam configuration, the polar-direct-drive (PDD) concept [S. Skupsky et al., Phys. …

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Gigabar Spherical Shock Generation on the OMEGA Laser

R. Nora, W. Theobald, R. Betti, F. J. Marshall et autres

This Letter presents the first experimental demonstration of the capability to launch shocks of several-hundred Mbar in spherical targets--a milestone for shock ignition [R. Betti et al., Phys. Rev. Lett. 98, 155001 (2007)]. Using the temporal delay between the launching of the …

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Fast-Electron Temperature Measurements in Laser Irradiation at $10^{14}$ W/cm$^2$

A. A. Solodov, B. Yaakobi, J. F. Myatt, C. Stöeckl et autres

Fuel Cavity Asymmetry at the Onset of Deceleration in ICF

Rahul Shah, F.J. Wysocki, V. Yu. Glebov, P. Hakel et autres