| Shrnutí: | Wetted-foam layers are of significant interest for inertial confinement fusion capsules, due to the
control they provide over the convergence ratio of the implosion, and the opportunity this affords
to minimize hydrodynamic instability growth. However, the equation of state (EOS) for fusion
relevant foams is not well characterized, and many simulations rely on modelling such foams as
a homogeneous medium with the foam average density. To address this question, an experiment
was performed using the the VULCAN Nd:glass laser at the Central Laser Facility. The aim was
to measure the principal Hugoniot of TMPTA plastic foams at 260 mg/cm3
, corresponding to the
density of liquid DT-wetted-foam layers, and their ‘hydrodynamic equivalent’ capsules. A VISAR
was used to obtain the shock velocity of both the foam and an α-quartz reference layer, while
streaked optical pyrometry provided the temperature of the shocked material. The measurements
confirm that, for the pressure range accessed, this material can indeed be well described using the
equation of state of the homogeneous medium at the foam density.
|
|---|