The Potential of Fast Ignition and Related Experiments with a Petawatt Laser Facility |
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| Authors: | M H Key E M Campbell T E Cowan S P Hatchett E A Henry J A Koch A B Langdon B F Lasinski A MacKinnon A A Offenberger D M Pennington M D Perry T J Phillips T C Sangster M S Singh R A Snavely M A Stoyer M Tsukamoto K B Wharton S C Wilks |
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| Affiliation: | (1) Lawrence Livermore National Laboratory, P.O. Box 808, L-473, Livermore, CA 94550, USA |
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| Abstract: | A model of energy gain induced by fast ignition of thermonuclear burn in compressed deuterium-tritium fuel, is used to show the potential for 300× gain with a driver energy of 1 MJ, if the National Ignition Facility (NIF) were to be adapted for fast ignition. The physics of fast ignition has been studied using a petawatt laser facility at the Lawrence Livermore National Laboratory. Laser plasma interaction in a preformed plasma on a solid target leads to relativistic self-focusing evidenced by x-ray images. Absorption of the laser radiation transfers energy to an intense source of relativistic electrons. Good conversion efficiency into a wide angular distribution is reported. Heating by the electrons in solid density CD2 produces 0.5 to 1 keV temperature, inferred from the D-D thermo-nuclear neutron yield. |
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