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The high-foot implosion campaign on the National Ignition Facility

2014; American Institute of Physics; Volume: 21; Issue: 5 Linguagem: Inglês

10.1063/1.4874330

1527-2419

O. A. Hurricane, D. A. Callahan, D. T. Casey, E. L. Dewald, Thomas Dittrich, T. Döppner, M. A. Barrios, D. E. Hinkel, L. Berzak Hopkins, P. Kervin, J. L. Kline, S. Le Pape, T. Ma, A. G. MacPhee, J. L. Milovich, J. D. Moody, A. Pak, P. K. Patel, H.-S. Park, B. A. Remington, H. F. Robey, J. D. Salmonson, P. T. Springer, R. Tommasini, L. R. Benedetti, J. A. Caggiano, P. M. Celliers, C. Cerjan, Rebecca Dylla‐Spears, D. H. Edgell, M.J. Edwards, D. N. Fittinghoff, G. P. Grim, N. Guler, N. Izumi, J. A. Frenje, M. Gatu Johnson, S. W. Haan, R. Hatarik, H. W. Herrmann, S. F. Khan, J. P. Knauer, B. Kozioziemski, A. L. Kritcher, G. A. Kyrala, S. A. MacLaren, F. E. Merrill, P. Michel, J. E. Ralph, J. S. Ross, J. R. Rygg, M. B. Schneider, B. K. Spears, K. Widmann, C. B. Yeamans,

Atomic and Molecular Physics

The “High-Foot” platform manipulates the laser pulse-shape coming from the National Ignition Facility laser to create an indirect drive 3-shock implosion that is significantly more robust against instability growth involving the ablator and also modestly reduces implosion convergence ratio. This strategy gives up on theoretical high-gain in an inertial confinement fusion implosion in order to obtain better control of the implosion and bring experimental performance in-line with calculated performance, yet keeps the absolute capsule performance relatively high. In this paper, we will cover the various experimental and theoretical motivations for the high-foot drive as well as cover the experimental results that have come out of the high-foot experimental campaign. At the time of this writing, the high-foot implosion has demonstrated record total deuterium-tritium yields (9.3×1015) with low levels of inferred mix, excellent agreement with implosion simulations, fuel energy gains exceeding unity, and evidence for the “bootstrapping” associated with alpha-particle self-heating.