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Indirect drive experiments utilizing multiple beam cones in cylindrical hohlraums on OMEGA

1998; American Institute of Physics; Volume: 5; Issue: 5 Linguagem: Inglês

10.1063/1.872866

1527-2419

T. J. Murphy, J. M. Wallace, N. D. Delamater, Cris W. Barnes, P. L. Gobby, A. Hauer, E. L. Lindman, G. R. Magelssen, J. B. Moore, J. A. Oertel, R. Watt, O. L. Landen, Peter Amendt, M. D. Cable, C. D. Decker, B. A. Hammel, Joachim Koch, L. J. Suter, R. E. Turner, R. J. Wallace, F. J. Marshall, D. K. Bradley, R. S. Craxton, R. L. Keck, J. P. Knauer, R. L. Kremens, Jeremy D. Schnittman,

Laser-induced spectroscopy and plasma

Current plans for time-dependent control of flux asymmetry in the National Ignition Facility [J. A. Paisner, J. D. Boyes, S. A. Kumpan, and M. Sorem, “The National Ignition Facility Project,” ICF Quart. 5, 110 (1995)] hohlraums rely on multiple beam cones with different laser power temporal profiles in each cone. Experiments with multiple beam cones have begun on the Omega laser facility [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] at the University of Rochester. In addition to allowing symmetry experiments similar to those performed on Nova [A. Hauer et al., Rev. Sci. Instrum. 66, 672 (1995)], the Omega facility allows multiple beam cones to be moved independently to confirm our ability to model the resulting implosion image shapes. Results indicate that hohlraum symmetry behaves similarly with multiple rings of beams as with a single ring, but with the weighted beam spot position used to parametrize the beam pointing.