One-dimensional isentropic compression

Abstract

The generation of nearly isentropic pressure‐density states in a molecular fluid sample, e.g. H_2O is examined by a series of one‐dimensional finite difference calculations. We employ a series of buffer materials of increasing shock impedance (Lexan, Al, Fe, W) behind the sample and impact it with a composite flyer plate of the same series of materials. In the case of H_2O impacted at 2.5 km/sec, three‐fold nearly isentropic compression to a pressure of 70 GPa is achieved in 10 μsec with a 3 cm thick composite impactor.

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