J Bailey

Publications (2)0 Total impact

• Conference Proceeding: Multi-keV photon production on the Z accelerator

  C.A. Coverdale, C. Deeney, M.R. Douglas, J Bailey, K.G. Whitney, J.P. Apruzese, J.W. Thornhill, J Davis, R Schneider
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  ABSTRACT: Summary form only given, as follows. Numerous pulsed power machines over the last 25 years have pursued the use Z-pinch loads as sources of radiation. Load designs have included gas puffs and wire arrays, with emissions from the K-shell (argon, aluminum, titanium), L-shell (nickel), and M-shell (tungsten) ail being studied. To expand the range of photon energies available from Z-pinch loads, experiments have been performed on the Z accelerator at Sandia National Labs using molybdenum wire arrays and stainless steel wire arrays. The 40 mm diameter Mo loads were designed to optimize the implosion time by varying the wire array mass. These arrays radiated in the L-shell and produced up to 135 kJ of 2-3 keV, a substantial increase over what has previously been achieved near this photon energy. The stainless steel wire arrays, which radiate primarily in the Fe K-shell at 6.7 keV, were 55 mm diameter arrays, also designed to optimize the implosion time through mass variations. These arrays generated approximately 50 kJ of Fe K-shell. Plans for further optimization of these sources will be discussed and comparisons to other Z-pinch sources will be made
  Plasma Science, 2000. ICOPS 2000. IEEE Conference Record - Abstracts. The 27th IEEE International Conference on; 02/2000
• Conference Proceeding: Improved dynamics and radiated powers from titanium Z-pinch implosions by employing nested wire arrays

  C. Deeney, C.A. Coverdale, M.R. Douglas, J. Bailey, J.W. Thornhill, K.G. Whitney, J.P. Apruzese, J. Davis, R. Clark, R. Schnelder
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  ABSTRACT: Summary form only given, as follows. Recent experiments on the 20-MA Z accelerator at SNL using nested, nickel-clad titanium wire arrays measured titanium K-shell (4800 eV) powers up to 15 TW, a 50% improvement over previous titanium measurements. Outer wire load diameters varied from 40 mm to 60 mm, with the inner arrays always being half the mass at half the initial diameter of the outer array. The nested wire arrays showed substantial improvements in Ti K-shell power over single Ti wire arrays, with faster risetimes (3 vs 5.5 ns) and narrower pulses (4 vs 7 ns). This power increase corresponded with the production of tighter pinches, i.c. 2 mm diameters versus 3 mm with single arrays. In addition, the efficiency of producing Ti K-shell emissions during the first pulse is seen to increase with increased implosion velocities when nested configurations are used. In this paper, comparisons will be made with previous, single array Ti experiments, and with one and two dimensional radiation-magneto-hydrodynamic calculations
  Plasma Science, 2000. ICOPS 2000. IEEE Conference Record - Abstracts. The 27th IEEE International Conference on; 02/2000