Impact of beam smoothing method on direct drive target performance for the NIF

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The impact of smoothing method on the performance of a direct drive target is modeled and examined in terms of its l-mode spectrum. In particular, two classes of smoothing methods are compared, smoothing by spectral dispersion (SSD) and the induced spatial incoherence (ISI) method. It is found that SSD using sinusoidal phase modulation (FM) results in poor smoothing at low l-modes and therefore inferior target performance at both peak velocity and ignition. Modeling of the hydrodynamic nonlinearity shows that saturation tends to reduce the difference between target performance for the smoothing methods considered. However, using SSD with more generalized phase ... continued below

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13 p.

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Rothenberg, J.E. & Weber, S.V. November 1, 1996.

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The impact of smoothing method on the performance of a direct drive target is modeled and examined in terms of its l-mode spectrum. In particular, two classes of smoothing methods are compared, smoothing by spectral dispersion (SSD) and the induced spatial incoherence (ISI) method. It is found that SSD using sinusoidal phase modulation (FM) results in poor smoothing at low l-modes and therefore inferior target performance at both peak velocity and ignition. Modeling of the hydrodynamic nonlinearity shows that saturation tends to reduce the difference between target performance for the smoothing methods considered. However, using SSD with more generalized phase modulation results in a smoothed spatial spectrum, and therefore target performance, which is identical to that obtained with the ISI or similar method where random phase plates are present in both methods and identical beam divergence is assumed.

Physical Description

13 p.

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INIS; OSTI as DE97051943

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  • 2. annual solid state lasers for applications to inertial confinement fusion (ICF), Paris (France), 22-25 Oct 1996

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  • Other: DE97051943
  • Report No.: UCRL-JC--124509
  • Report No.: CONF-9610225--22
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 461409
  • Archival Resource Key: ark:/67531/metadc675757

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Office of Scientific & Technical Information Technical Reports

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  • November 1, 1996

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  • July 25, 2015, 2:21 a.m.

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  • Feb. 16, 2016, 7:49 p.m.

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Rothenberg, J.E. & Weber, S.V. Impact of beam smoothing method on direct drive target performance for the NIF, article, November 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc675757/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.