Measuring the principal Hugoniot of inertial-confinement-fusion-relevant TMPTA plastic foams
Résumé
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 for fusion-relevant foams are not well characterized, and many
simulations rely on modeling such foams as a homogeneous medium with the foam average density. To address
this issue, an experiment was performed using 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/cm$^3$, 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 $\alpha$-quartz reference layer, while streaked optical pyrometry provided the temperature of the shocked material. The measurements confirm that, for the 20–120 GPa pressure range accessed, this material can indeed be well described using the equation of state of the homogeneous medium at the foam density.
Domaines
Physique [physics]| Origine | Fichiers produits par l'(les) auteur(s) |
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