Laboratory Observation of Secondary Shock Formation Ahead of a Strongly Radiative Blast Wave

Authors: Hansen, J.; Edwards, M.; Froula, D.; Edens, A.; Gregori, G.; Ditmire, T.

Source: Astrophysics and Space Science, Volume 307, Numbers 1-3, January 2007 , pp. 219-225(7)

Publisher: Springer

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Abstract:

We have previously reported the experimental discovery of a second shock forming ahead of a radiative shock propagating in Xe. The initial shock is spherical, radiative, with a high Mach number, and it sends a supersonic radiative heat wave far ahead of itself. The heat wave rapidly slows to a transonic regime and when its Mach number drops to two with respect to the downstream plasma, the heat wave drives a second shock ahead of itself to satisfy mass and momentum conservation in the heat wave reference frame. We now show experimental data from a range of mixtures of Xe and N2, gradually changing the properties of the initial shock and the environment into which the shock moves and radiates (the radiative conductivity and the heat capacity). We have successfully observed second shock formation over the entire range from 100% Xe mass fraction to 100% N2. The formation radius of the second shock as a function of Xe mass fraction is consistent with an analytical estimate.

Keywords: Heat wave; Radiative; Shock; Supernova

Document Type: Research Article

DOI: http://dx.doi.org/10.1007/s10509-007-9292-3

Affiliations: Email: hansen46@llnl.gov

Publication date: January 1, 2007

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