Quasi-spherical direct drive fusion simulations for the Z machine and future accelerators.

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We explored the potential of Quasi-Spherical Direct Drive (QSDD) to reduce the cost and risk of a future fusion driver for Inertial Confinement Fusion (ICF) and to produce megajoule thermonuclear yield on the renovated Z Machine with a pulse shortening Magnetically Insulated Current Amplifier (MICA). Analytic relationships for constant implosion velocity and constant pusher stability have been derived and show that the required current scales as the implosion time. Therefore, a MICA is necessary to drive QSDD capsules with hot-spot ignition on Z. We have optimized the LASNEX parameters for QSDD with realistic walls and mitigated many of the risks. ... continued below

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50 p.

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VanDevender, J. Pace; McDaniel, Dillon Heirman; Roderick, Norman Frederick & Nash, Thomas J. November 1, 2007.

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Description

We explored the potential of Quasi-Spherical Direct Drive (QSDD) to reduce the cost and risk of a future fusion driver for Inertial Confinement Fusion (ICF) and to produce megajoule thermonuclear yield on the renovated Z Machine with a pulse shortening Magnetically Insulated Current Amplifier (MICA). Analytic relationships for constant implosion velocity and constant pusher stability have been derived and show that the required current scales as the implosion time. Therefore, a MICA is necessary to drive QSDD capsules with hot-spot ignition on Z. We have optimized the LASNEX parameters for QSDD with realistic walls and mitigated many of the risks. Although the mix-degraded 1D yield is computed to be {approx}30 MJ on Z, unmitigated wall expansion under the > 100 gigabar pressure just before burn prevents ignition in the 2D simulations. A squeezer system of adjacent implosions may mitigate the wall expansion and permit the plasma to burn.

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50 p.

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  • Report No.: SAND2007-7178
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/922753 | External Link
  • Office of Scientific & Technical Information Report Number: 922753
  • Archival Resource Key: ark:/67531/metadc901370

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  • November 1, 2007

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 7, 2016, 8:05 p.m.

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VanDevender, J. Pace; McDaniel, Dillon Heirman; Roderick, Norman Frederick & Nash, Thomas J. Quasi-spherical direct drive fusion simulations for the Z machine and future accelerators., report, November 1, 2007; United States. (digital.library.unt.edu/ark:/67531/metadc901370/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.