Illumination uniformity requirements for direct drive inertial confinement fusion

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The requirements for laser uniformity are discussed in terms of the {ell}-mode spectrum. It is shown that the choice of smoothing methods can significantly alter this spectrum and that this choice should be made in the context of the target physics. Although two dimensional smoothing by spectral dispersion yields a high quality near field beam profile, it results in poor smoothing for low spatial frequency. The partially coherent light method (fiber smoothing) leads to superior smoothing at low spatial frequencies, but has very poor near field beam quality. As a result, it may be desirable to use partially coherent light ... continued below

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12 p.

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Rothenberg, J. E.; Eimerl, D.; Key, M. H. & Weber, S. V. July 11, 1995.

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Description

The requirements for laser uniformity are discussed in terms of the {ell}-mode spectrum. It is shown that the choice of smoothing methods can significantly alter this spectrum and that this choice should be made in the context of the target physics. Although two dimensional smoothing by spectral dispersion yields a high quality near field beam profile, it results in poor smoothing for low spatial frequency. The partially coherent light method (fiber smoothing) leads to superior smoothing at low spatial frequencies, but has very poor near field beam quality. As a result, it may be desirable to use partially coherent light during the driver pulse foot (at low intensity and when minimizing the laser imprint is critical) and smoothing by spectral dispersion during the main pulse.

Physical Description

12 p.

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INIS; OSTI as DE96000074

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  • 1. annual solid-state lasers for application to inertial confinement fusion meeting, Monterey, CA (United States), 30 May - 2 Jun 1995

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  • Other: DE96000074
  • Report No.: UCRL-JC--121195
  • Report No.: CONF-9505264--23
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 110680
  • Archival Resource Key: ark:/67531/metadc621852

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Office of Scientific & Technical Information Technical Reports

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  • July 11, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 16, 2016, 7:48 p.m.

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Rothenberg, J. E.; Eimerl, D.; Key, M. H. & Weber, S. V. Illumination uniformity requirements for direct drive inertial confinement fusion, article, July 11, 1995; California. (digital.library.unt.edu/ark:/67531/metadc621852/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.