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Title: 2D radiation-magnetohydrodynamic simulations of SATURN imploding Z-pinches

Z-pinch implosions driven by the SATURN device at Sandia National Laboratory are modeled with a 2D radiation magnetohydrodynamic (MHD) code, showing strong growth of magneto-Rayleigh 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. 2D krypton simulations show an output x-ray power > 80 TW for the peaked profile.
Authors:
; ;  [1]
  1. and others
Publication Date:
OSTI Identifier:
192472
Report Number(s):
UCRL-JC-122340; CONF-951182-7
ON: DE96005395; TRN: 96:006491
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 37. annual meeting of the American Physical Society Division of Plasma Physics, Louisville, KY (United States), 6-10 Nov 1995; Other Information: PBD: 6 Nov 1995
Research Org:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
07 ISOTOPE AND RADIATION SOURCE TECHNOLOGY; 66 PHYSICS; LINEAR Z PINCH DEVICES; RAYLEIGH-TAYLOR INSTABILITY; IMPLOSIONS; X-RAY SOURCES; MAGNETOHYDRODYNAMICS; ALUMINIUM; PLASMA SIMULATION