Performance of Direct-Drive Cryogenic Targets on OMEGA
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چکیده
LLE Review, Volume 113 16 Introduction In the inertial confinement fusion (ICF) approach to fusion, a spherical shell filled with a deuterium–tritium (DT) mixture is compressed to reach a temperature of 10 to 12 keV in the lower-density central core region (hot spot) to initiate a burn wave through the higher-density colder main fuel surrounding the core.1–3 The main fuel areal density (tR) at that time must be large enough to burn a significant fraction of the fuel.1,2 The peak areal density depends mainly on the fuel adiabat (defined as a ratio of the shell pressure to the Fermi-degenerate pressure at the shell density) and laser energy:4
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First Results from Cryogenic Target Implosions on OMEGA
LLE Review, Volume 90 49 Introduction The base-line direct-drive ignition target design for the National Ignition Facility (NIF)1 is a thick cryogenic DT-ice layer enclosed in a thin CH shell.2,3 In direct-drive inertial confinement fusion (ICF)4 a spherical target is illuminated by a large number of laser beams to provide a spherically symmetric implosion. Target implosions with cryogenic DT f...
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The compression of direct-drive, spherical implosions is studied using cryogenic D2 targets on the 60-beam, 351-nm OMEGA laser with intensities ranging from approximately 3x10(14) to approximately 1x10(15) W/cm2. The hard-x-ray signal from hot electrons generated by laser-plasma instabilities increases with laser intensity, while the areal density decreases. Mitigating hot-electron production, ...
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