Modeling of laser knife-edge and pinhole experiments

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We describe simulations of experiments involving laser illumination of a metallic knife edge in the Optical Sciences Laboratory (OSL) at LLNL, and pinhole closure in the Beamlet experiment at LLNL. The plasma evolution is modeled via LASNEX. In OSL, the calculated phases of a probe beam are found to exhibit the same behavior as in experiment but to be consistently larger. The motion of a given phase � contour tends to decelerate at high intensities. At fixed intensity, the speed decreases with atomic mass. We then calculate the plasmas associated with 4-leaf pinholes on the Beamlet transport spatial filter. We ... continued below

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Auerbach, J M; Boley, C D; Estabrook, K G; Feit, M D & Rubenchik, A M June 29, 1998.

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We describe simulations of experiments involving laser illumination of a metallic knife edge in the Optical Sciences Laboratory (OSL) at LLNL, and pinhole closure in the Beamlet experiment at LLNL. The plasma evolution is modeled via LASNEX. In OSL, the calculated phases of a probe beam are found to exhibit the same behavior as in experiment but to be consistently larger. The motion of a given phase � contour tends to decelerate at high intensities. At fixed intensity, the speed decreases with atomic mass. We then calculate the plasmas associated with 4-leaf pinholes on the Beamlet transport spatial filter. We employ a new propagation code to follow a realistic input beam through the entire spatial filter, including the plasmas. The detailed behavior of the output wavefronts is obtained. We show how closure depends on the orientation and material of the pinhole blades. As observed in experiment, a diamond orientation is preferable to a square orientation, and tantalum performs better than stainless

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  • 3rd Annual International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, Monterey, CA, June 7-12, 1998

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  • Other: DE00003073
  • Report No.: UCRL-JC-129613
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 3073
  • Archival Resource Key: ark:/67531/metadc682343

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  • June 29, 1998

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  • July 25, 2015, 2:20 a.m.

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  • May 6, 2016, 11:29 p.m.

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Auerbach, J M; Boley, C D; Estabrook, K G; Feit, M D & Rubenchik, A M. Modeling of laser knife-edge and pinhole experiments, article, June 29, 1998; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc682343/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.