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Physical Review Letters
Lemke, R.W.; Sinars, Daniel S. ; Waisman, E.M.; Cuneo, M.E. ; Yu, E.P.; Haill, Thomas A. ; Hanshaw, Heath L. ; Brunner, Thomas A. ; Jennings, C.A.; Stygar, William A. ; Desjarlais, Michael P. ; Mehlhorn, Thomas A. ; Porter, J.L.
X-ray production by imploding wire-array Z pinches is studied using radiation magnetohydrodynamics simulation. It is found that the density distribution created by ablating wire material influences both x-ray power production, and how the peak power scales with applied current. For a given array there is an optimum ablation rate that maximizes the peak x-ray power, and produces the strongest scaling of peak power with peak current. This work is consistent with trends in wire-array Z pinch x-ray power scaling experiments on the Z accelerator. © 2009 The American Physical Society.
Physics of Plasmas
Yu, Edmund Y. ; Cuneo, M.E. ; Desjarlais, Michael P. ; Lemke, Raymond W. ; Sinars, Daniel S. ; Haill, Thomas A. ; Waisman, E.M.; Bennett, G.R.; Jennings, C.A.; Mehlhorn, T.A.; Brunner, T.A.; Hanshaw, H.L.; Porter, J.L.; Stygar, W.A.; Rudakov, L.I.
The implosion phase of a wire-array Z pinch is investigated using three-dimensional (3D) simulations, which model the mass ablation phase and its associated axial instability using a mass injection boundary condition. The physical mechanisms driving the trailing mass network are explored, and it is found that in 3D the current paths though the trailing mass can reduce bubble growth on the imploding plasma sheath, relative to the 2D (r,z) equivalent. Comparison between the simulations and a high quality set of experimental radiographs is presented. © 2008 American Institute of Physics.
Lemke, Raymond W. ; Sinars, Daniel S. ; Yu, Edmund Y. ; Haill, Thomas A. ; Brunner, Thomas A. ; Hanshaw, Heath L. ; Cuneo, M.E. ; Desjarlais, Michael P. ; Mehlhorn, Thomas A.
Mattsson, Thomas M. ; Desjarlais, Michael P. ; Knudson, Marcus D.
Desjarlais, Michael P. ; Vogler, Tracy V.
Carpenter, John H. ; Desjarlais, Michael P. ; Wills, Ann E.
Lemke, Raymond W. ; Haill, Thomas A. ; Yu, Edmund Y. ; Sinars, Daniel S. ; Hanshaw, Heath L. ; Brunner, Thomas A. ; Cuneo, M.E. ; Desjarlais, Michael P. ; Mehlhorn, Thomas A.
Desjarlais, Michael P. ; Dolan, Daniel H. ; Lemke, Raymond W.
Nature
Desjarlais, Michael P. ; Mattsson, Thomas M.
Hanshaw, Heath L. ; Lemke, Raymond W. ; Yu, Edmund Y. ; Desjarlais, Michael P. ; Mehlhorn, Thomas A.
Proceedings APS Shock Compression of Condensed Matter 2007
Desjarlais, Michael P. ; Mattsson, Thomas M.
Knudson, Marcus D. ; Desjarlais, Michael P. ; Lemke, Raymond W.
Desjarlais, Michael P. ; Knudson, Marcus D. ; Lemke, Raymond W.
Knudson, Marcus D. ; Lemke, Raymond W. ; Desjarlais, Michael P.
Cuneo, M.E. ; Lemke, Raymond W. ; Desjarlais, Michael P. ; Jennings, Christopher A. ; Sinars, Daniel S.
Proposed for publication in Physical Review Letters.
Desjarlais, Michael P. ; Mattsson, Thomas M.
Mehlhorn, Thomas A. ; Yu, Edmund Y. ; Vesey, Roger A. ; Cuneo, M.E. ; Jones, Brent M. ; Knudson, Marcus D. ; Sinars, Daniel S. ; Robinson, Allen C. ; Trucano, Timothy G. ; Brunner, Thomas A. ; Desjarlais, Michael P. ; Garasi, Christopher J. ; Haill, Thomas A. ; Hanshaw, Heath L. ; Lemke, Raymond W. ; Oliver, Bryan V. ; Peterson, Kyle J.
Desjarlais, Michael P.
Alexander, Charles S. ; Thompson, Aidan P. ; Chhabildas, Lalit C. ; Furnish, Michael D. ; Dolan, Daniel H. ; Davis, Jean-Paul D. ; Lemke, Raymond W. ; Desjarlais, Michael P. ; Hertel, Eugene S.
Modine, N.A. ; Wright, Alan F. ; Muller, Richard P. ; Sears, Mark P. ; Wills, Ann E. ; Desjarlais, Michael P.
A finite temperature version of 'exact-exchange' density functional theory (EXX) has been implemented in Sandia's Socorro code. The method uses the optimized effective potential (OEP) formalism and an efficient gradient-based iterative minimization of the energy. The derivation of the gradient is based on the density matrix, simplifying the extension to finite temperatures. A stand-alone all-electron exact-exchange capability has been developed for testing exact exchange and compatible correlation functionals on small systems. Calculations of eigenvalues for the helium atom, beryllium atom, and the hydrogen molecule are reported, showing excellent agreement with highly converged quantumMonte Carlo calculations. Several approaches to the generation of pseudopotentials for use in EXX calculations have been examined and are discussed. The difficult problem of finding a correlation functional compatible with EXX has been studied and some initial findings are reported.
Mattsson, Thomas M. ; Desjarlais, Michael P.
Lemke, Raymond W. ; Vesey, Roger A. ; Desjarlais, Michael P. ; Cuneo, M.E. ; Mehlhorn, Thomas A.
Cuneo, M.E. ; Leifeste, Gordon T. ; Smith, Ian C. ; Stygar, William A. ; Sinars, Daniel S. ; Bennett, Guy R. ; Yu, Edmund Y. ; Lemke, Raymond W. ; Desjarlais, Michael P. ; Adams, Richard G. ; Bliss, David E. ; Jones, Michael J.
Mattsson, Thomas M. ; Desjarlais, Michael P.
Desjarlais, Michael P.
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