The first target experiments on the National Ignition Facility |
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Institution: | (1) Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA 94550, USA;(2) Los Alamos National Laboratory, Los Alamos, NM 87544, USA;(3) Atomic Weapons Establishment, Chilton, UK;(4) Sandia National Laboratory, Albuquerque, NM 87185, USA;(5) Commissariat à l'énergie Atomique, Bruyères-Le-Chatel, France;(6) Laboratory for Laser Energetics, Rochester, NY 14623, USA;(7) Bechtel Nevada, Livermore, CA 94550, USA |
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Abstract: | A first set of shock timing, laser-plasma interaction, hohlraum energetics
and hydrodynamic experiments have been performed using the first 4 beams of
the National Ignition Facility (NIF), in support of indirect drive Inertial
Confinement Fusion (ICF) and High Energy Density Physics (HEDP). In
parallel, a robust set of optical and X-ray spectrometers, interferometer,
calorimeters and imagers have been activated. The experiments have been
undertaken with laser powers and energies of up to 8 TW and 17 kJ in flattop
and shaped 1–9 ns pulses focused with various beam smoothing options. The
experiments have demonstrated excellent agreement between measured and
predicted laser-target coupling in foils and hohlraums, even when extended
to a longer pulse regime unattainable at previous laser facilities,
validated the predicted effects of beam smoothing on intense laser beam
propagation in long scale-length plasmas and begun to test 3D codes by
extending the study of laser driven hydrodynamic jets to 3D geometries. |
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Keywords: | 52 Physics of plasmas and electric discharges 52 57 -z Laser inertial confinement 52 38 -r Laser-plasma interactions |
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