Radiatively cooled plasma and high Mach number jets in wire array Z-pinches

Details Radiatively cooled plasma and high Mach number jets in wire array Z-pinches Radiatively cooled plasma and high Mach number jets in wire array Z-pinches

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...196.2211l&link_type=abstract

American Astronomical Society, 196th AAS Meeting, #22.11; Bulletin of the American Astronomical Society, Vol. 32, p.1281

Astronomy and Astrophysics

Astrophysics

Scientific paper

The generation of plasmas, the dynamic of which depend on radiative losses, is of considerable interest for astrophysics. We will present experiments with wire array z-pinch implosions [1] which show that the parameters of a narrow precursor plasma column [2,3], formed on the array axis, are dominated by radiative cooling. Pressure balance in this system (which is virtually current-free) is provided by the kinetic pressure of cylindrically convergent plasma streams, while the radiative losses determine the final plasma density and diameter. The parameters of the precursor were measured by laser probing, soft x-ray imaging and time-resolved XUV spectroscopy. The observed decrease of the plasma diameter with atomic number of the material (C, Al, W), and the high degree of radial convergence (50 for W) indicate the importance of radiative cooling in the plasma dynamics. In the experiments with conical wire arrays, the formation of supersonic plasma jets was observed and measurements of the jet parameters will be presented. The interaction of this jet with a plasma target could be used for scaled [4] laboratory astrophysics experiments on hydrodynamic instabilities in decelerated plasma flow, and, under different conditions, to study the transition from collisionless to collisional regimes in colliding plasmas. References: 1. M.K. Matzen, Phys. Plasmas v.4, 1519 (1997) 2. S.V. Lebedev et al., Phys. Plasmas v.6, 2016 (1998) 3. J.P. Chittenden et al., Phys. Rev. Letters, v.83, 100 (1999) 4. D. Ryutov et al., ApJ, v.518, 821 (1999)

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