Abstract
We investigate the ignition and burning of a precompressed laser fusion target when it is rapidly heated by an ion beam with the formation of a temperature peak in the central part of the target. We present the results of our comprehensive numerical simulations of the problem that include the following components: (1) the target compression under the action of a profiled laser pulse, (2) the heating of the compressed target with spatially nonuniform density and temperature distributions by a beam of high-energy ions, and (3) the burning of the target with the initial spatial density distribution formed at the instant of maximum target compression and the initial spatial temperature distribution formed as a result of the compressed-target heating by an ion beam. The dependences of the threshold energies of the igniting ion beam and the thermonuclear gain on the width of the Gaussian beam ion energy spectrum have been established. The peculiarities of fast ignition by an ion beam related to the spatial distribution of parameters for the target precompressed by a laser pulse are discussed.
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Original Russian Text © S.Yu. Gus’kov, N.V. Zmitrenko, D.V. Il’in, V.E. Sherman, 2014, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2014, Vol. 146, No. 5, pp. 1090–1105.
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Gus’kov, S.Y., Zmitrenko, N.V., Il’in, D.V. et al. Fast ignition when heating the central part of an inertial confinement fusion target by an ion beam. J. Exp. Theor. Phys. 119, 958–970 (2014). https://doi.org/10.1134/S1063776114110077
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DOI: https://doi.org/10.1134/S1063776114110077