New laser driver for physics modeling codes using unstructured 3d grids

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We present a status report on the current state of development, testing and application of a new scheme for laser beam evolution and power deposition on three-dimensional unstructured grids. The scheme is being encapsulated in a C++ library for convenient porting to existing modeling codes. We have added a new ray propagator that is second order in time, allowing rays to refract within computational zones as well as at zone interfaces. In a globally constant free-electron density gradient on a randomized hexahedral mesh,the new integrator produces ray trajectories that agree with analytic results to within machine roundoff. A new method ... continued below

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242 Kilobytes

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Kaiser, T; Milovich, J L; Prasad, M K & Shestakov, A I February 1, 1999.

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Description

We present a status report on the current state of development, testing and application of a new scheme for laser beam evolution and power deposition on three-dimensional unstructured grids. The scheme is being encapsulated in a C++ library for convenient porting to existing modeling codes. We have added a new ray propagator that is second order in time, allowing rays to refract within computational zones as well as at zone interfaces. In a globally constant free-electron density gradient on a randomized hexahedral mesh,the new integrator produces ray trajectories that agree with analytic results to within machine roundoff. A new method for computing the inverse-bremmstrahlung energy deposition rate that captures its highly non-uniform spatial dependence within a zone has also been added. This allows accurate trajectories without the necessity of sub-stepping in time. Other enhancements (not discussed) include multiple user-configurable beams, computation of the electron oscillation velocity in the laser electric field and energy-deposition accounting. Results of laser-driven simulations are presented in a companion paper.

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242 Kilobytes

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  • Nuclear Explosives Development Conference, Las Vegas, NV, October 25-30, 1998

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  • Other: DE00007715
  • Report No.: UCRL-JC-131380
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 7715
  • Archival Resource Key: ark:/67531/metadc723265

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  • February 1, 1999

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  • Sept. 29, 2015, 5:31 a.m.

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  • May 6, 2016, 10:56 p.m.

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Kaiser, T; Milovich, J L; Prasad, M K & Shestakov, A I. New laser driver for physics modeling codes using unstructured 3d grids, article, February 1, 1999; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc723265/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.