Actions for Radiation MHD modeling of a proposed dynamic hohlraum [electronic resource].

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Radiation MHD modeling of a proposed dynamic hohlraum [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1997.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
8 pages : digital, PDF file
Additional Creators
Lawrence Livermore National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
In this paper we report 2D radiation magnetohydrodynamic simulations of a dynamic hohlraum target designed to be driven by the Z accelerator at Sandia National Laboratory, Albuquerque New Mexico. Z generates currents up 20 MA with a rise time of 100 ns and peak electrical power of 40 TW. In this design we attempt to reduce the effects of magneto-Rayleigh Taylor (RT) modes by using a distributed initial density profile. Earlier work showed that ``tailoring`` the initial density profile could reduce the sheath acceleration and the number of e-foldings that the RT instability grows during the implosion . As the sheath moves in radially, fresh material is swept up or ``snow plowed``, providing a back pressure that counters the J x B force. A special profile can be found in which the unstable outer surface of the sheath implodes at constant velocity, reducing the classical growth rate to zero, although residual Richtmeyer-Meshkov type instability (instability of the snow-plow shock front) may be present. In practice, it is hard to create tailored initial density profiles due to the difficulty of machining and otherwise manipulating very low density materials. It becomes easier to manufacture these complex targets as the current, energy and load mass increase with large drivers. Z is the first fast pulse power device with enough energy to consider loads of this type.
Report Numbers
E 1.99:ucrl-jc--125849
E 1.99: conf-9705120--
conf-9705120--
ucrl-jc--125849
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
07/01/1997.
"ucrl-jc--125849"
" conf-9705120--"
"DE98051159"
4. international conference on dense Z-pinches, Vancouver (Canada), 28-31 May 1997.
Zimmerman, G.B.; Toor, A.; Hammer, J.H.; Tabak, M.; De Groot, J.S.
Funding Information
W-7405-ENG-48
AC04-94AL85000
View MARC record | catkey: 14739815