A self-similar isochoric implosion for fast ignition

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<jats:p>Various gain models have shown the potentially great advantages of fast ignition (FI) inertial confinement fusion (ICF) over its conventional hot spot ignition counterpart (e.g. Atzeni S. 1999<jats:italic>Phys. Plasmas</jats:italic><jats:bold>6</jats:bold>3316; Tabak M.<jats:italic>et al</jats:italic>2006<jats:italic>Fusion Sci. Technol.</jats:italic><jats:bold>49</jats:bold>254). These gain models, however, all assume nearly uniform density fuel assemblies. In contrast, conventional ICF implosions yield hollowed fuel assemblies with a high-density shell of fuel surrounding a low-density, high-pressure hot spot. Hence, to realize fully the advantages of FI, an alternative implosion design must be found which yields nearly isochoric fuel assemblies without substantial hot spots. Here, it is shown that a self-similar spherical implosion of the type originally studied by Guderley (1942<jats:italic>Luftfahrtforschung</jats:italic><jats:bold>19</jats:bold>302) may be employed to yield precisely such quasi-isochoric imploded states. The difficulty remains, however, of accessing these self-similarly imploding configurations from initial conditions representing an actual ICF target, namely a uniform, solid-density shell at rest. Furthermore, these specialized implosions must be realized for practicable drive parameters and at the scales and energies of interest in ICF. A direct-drive implosion scheme is presented which meets all of these requirements and reaches a nearly isochoric assembled density of 300 g cm<jats:sup>−3</jats:sup>and areal density of 2.4 g cm<jats:sup>−2</jats:sup>using 485 kJ of laser energy.</jats:p>

収録刊行物

  • Nuclear Fusion

    Nuclear Fusion 47 (9), 1147-1156, 2007-08-22

    IOP Publishing

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