Simulations of laser imprint for Nova experiments and for ignition capsules Page: 3 of 31
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Simulations of laser imprint for Nova experiments and for
S.V. Weber, S.G. Glendinning, D.H. Kalantar, M.H. Key, B.A. Remington, J.E.
Lawrence Livermore National Laboratory,
Livermore, California 94550
Rutherford Appleton Laboratory, Chilton, Didcot, United Kingdom
C.P. Verdon, and J.P. Knauer
Laboratory for Laser Energetics, University of Rochester, Rochester, NY 14623
(November 8, 1996)
In direct drive ICF, nonuniformities in laser illumination seed ripples at the
ablation front in a process called "imprint". These nonuniformities grow dur-
ing the capsule implosion and, if initially large enough, can penetrate the
capsule shell, impede ignition, or degrade burn. Imprint has been simulated
for recent experiments performed on the Nova laser at LLNL examining a
variety of beam smoothing conditions. Most used laser intensities similar to
the early part of an ignition capsule pulse shape, I ~ 1013 W/cm2. The simu-
lations matched most of the measurements of imprint modulation. The effect
of imprint upon National Ignition Facility (NIF) direct drive ignition capsules
has also been simulated. Imprint is predicted to give modulation comparable
to an intrinsic surface finish of ~10 nm RMS. Modulation growth was ex-
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Weber, S.V.; Glendinning, S.G.; Kalantar, D.H.; Key, M.H.; Remington, B.A.; Rothenberg, J.E. et al. Simulations of laser imprint for Nova experiments and for ignition capsules, article, November 8, 1996; California. (https://digital.library.unt.edu/ark:/67531/metadc692918/m1/3/?rotate=270: accessed May 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.