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Author Hammer, J. H. ♦ Eddleman, J. L. ♦ Springer, P. T. ♦ Tabak, M. ♦ Toor, A. ♦ Wong, K. L. ♦ Zimmerman, G. B. ♦ Deeney, C. ♦ Humphreys, R. ♦ Nash, T. J. ♦ Sanford, T. W. ♦ Spielman, R. B. ♦ De Groot, J. S.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION ♦ IMPLOSIONS ♦ RAYLEIGH-TAYLOR INSTABILITY ♦ PINCH DEVICES ♦ PLASMA SIMULATION ♦ PINCH EFFECT ♦ MAGNETOHYDRODYNAMICS ♦ KRYPTON ♦ X RADIATION ♦ ACCELERATORS ♦ INSTABILITY GROWTH RATES ♦ LINEAR Z PINCH DEVICES
Abstract Z-pinch implosions driven by the SATURN device [D. D. Bloomquist {ital et} {ital al}., {ital Proceedings} {ital of} {ital the} 6{ital th} {ital Institute} {ital of} {ital Electrical} {ital and} {ital Electronics} {ital Engineers} ({ital IEEE}) {ital Pulsed} {ital Power} {ital Conference}, Arlington, VA, edited by P. J. Turchi and B. H. Bernstein (IEEE, New York, 1987), p. 310] at Sandia National Laboratory are modeled with a two-dimensional radiation magnetohydrodynamic (MHD) code, showing strong growth of the magneto-Rayleigh{endash}Taylor (MRT) instability. Modeling of the linear and nonlinear development of MRT modes predicts growth of bubble-spike structures that increase the time span of stagnation and the resulting x-ray pulse width. Radiation is important in the pinch dynamics, keeping the sheath relatively cool during the run-in and releasing most of the stagnation energy. The calculations give x-ray pulse widths and magnitudes in reasonable agreement with experiments, but predict a radiating region that is too dense and radially localized at stagnation. We also consider peaked initial density profiles with constant imploding sheath velocity that should reduce MRT instability and improve performance. Krypton simulations show an output x-ray power {approx_gt}80 TW for the peaked profile. {copyright} {ital 1996 American Institute of Physics.}
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-05-01
Publisher Department Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publisher Place United States
Journal Physics of Plasmas
Volume Number 3
Issue Number 5
Organization Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)


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