Session C3 - Equation of State I.
MIXED session, Monday morning, July 28
101,
A knowledge of a material's equation-of-state (EOS) is essential for hydrodynamic calculations. Although laser experiments investigate the pressure range between those attainable by gas guns (<few Mbar) and UGT's (>10Mbar) where no other data exist, it is still advantageous to obtain high accuracy data to discriminate between EOS models which have been compared with gas gun and UGT data to a few percent in pressure. The AWE HELEN laser is being used to obtain high pressure Hugoniot data by the impedance match method. Indirect drive generates pressures up to 10Mbar in the aluminium reference material. Shock velocities are obtained by observing the visible light emitted on break-out from the surface of the target using optical streak cameras.Experiments have been performed on copper and brominated plastic.Attention to target fabrication and metrology, diagnostic calibration, shock uniformity and attenuation and data analysis have enabled us to measure shock velocities to an accuracy of ~1it intact.