Radiative properties of high wire number tungsten arrays with implosion times up to 250 ns

Details Radiative properties of high wire number tungsten arrays with implosion times up to 250 ns Radiative properties of high wire number tungsten arrays with implosion times up to 250 ns

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999phpl....6.3576d&link_type=abstract

Physics of Plasmas, Volume 6, Issue 9, pp. 3576-3586 (1999).

Physics

25

Theta Pinch, Fueling, Heating And Ignition, X- And Gamma-Ray Instruments

Scientific paper

High wire number, 25-mm-diameter tungsten wire arrays have been imploded on the 8-MA Saturn generator [R. B. Spielman et al., AIP Conference Proceeding 195, 3 (American Institute of Physics, Woodbury, NY 1989)], operating in a long-pulse mode. By varying the mass of the arrays from 710 to 6140 μg/cm, implosion times of 130-250 ns have been obtained with implosion velocities of 50-25 cm/μs, respectively. These Z-pinch implosions produced plasmas with millimeter diameters that radiated 600-800 kJ of x-rays, with powers of 20-49 TW; the corresponding pulsewidths were 19-7.5 ns, with risetimes ranging from 6.5 to 4.0 ns. These powers and pulsewidths are similar to those achieved with 50-ns implosion times on Saturn. Two-dimensional, radiation-magnetohydrodynamic calculations indicate that the imploding shells in these long implosion time experiments are comparable in width to those in the short-pulse cases. This can be due to lower initial perturbations. A heuristic wire array model suggests that the reduced perturbations, in the long-pulse cases, may be due to the individual wire merger occurring well before the acceleration of the shell. The experiments and modeling suggest that 150-200 ns implosion time Z-pinches could be employed for high-power, x-ray source applications.

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