Progress on deuterium EOS measurements on Z

Hanson, D. L.; Asay, J. R.; Hall, C. A.; Knudson, M. D.; Bailey, J. E.; Fleming, K. J.; Johnston, R. R.; Clark, B. F.; Bernard, M. A.; Anderson, W. W.; Hassall, G.; Rothman, S. D.
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p1175
Academic Journal
Recent NOVA laser experiments featuring ablatively-generated data on very small liquid deuterium samples have shown an unexpected degree of compressibility in deuterium as it undergoes molecular dissociation to a metallic phase above 25 GPa. To test these controversial results under somewhat different shock loading conditions, we have developed a cryogenic target system on the Sandia Z pulsed radiation source for precision EOS studies of liquid deuterium using radiation-driven shocks. Experiments are underway to develop a constant pressure drive of 10-20 ns duration spatially uniform over a relatively large area (3-4 mm diameter) with minimal preheat effects. Techniques are also being developed to perform fiber-optic-coupled VISAR interferometry, active shock breakout, and optical spectroscopy measurements on the stepped Al pusher plate and liquid deuterium sample in the Z bremsstrahlung environment. Initial VISAR measurements have been able to track the highly reflective metalized shock front propagating in deuterium at pressures of about 55 Gpa.


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