Two-Dimensional Effects in Laser-Solid Simulation Studies.
Final rept. 1 Jun 71-31 Jul 73,
CALSPAN CORP BUFFALO N Y
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The objective of this program is to study the two-dimensional wave motions induced in a target by high-power laser radiation. For these studies the target is an axisymmetric, supersonic free-jet of hydrogen gas which is laser irradiated on axis. The transparency of the target permits luminosity and schilieren streak photography of the forward-facing waves that propagate into the high-pressure plenum. Measurements of the axial and lateral luminous plasma growth during the laser pulse and of the axial shock wave growth after the pulse have been obtained for hydrogen gas targets over a range of plenum pressures and laser powers. It has been found that the axial luminous-front growth can be predicted by a deflagration model in this model the velocity scales with the parameter absorbed power divided by gas reservoir pressure to the one-third power. The shock-wave velocity along the axis of symmetry also appears to scale with this parameter. An explanation for this latter result has been proposed. Author
- Plasma Physics and Magnetohydrodynamics