Multiscale Temperature Measurements in Shocked High Explosives Using Raman Thermometry

Raman thermometry (RT) provides an attractive route for measuring the dynamic temperatures of shocked materials given its high time resolution, optical coupling, and its exclusion of material-dependent parameters. In this work, we plan to couple two shock drive sources- laser driven flyer plates and gas gun-driven impactors- to RT for measuring in-situ shock temperatures in single crystalline materials. Initial proof-of-principle experiments with RT and laser driven flyer plates were conducted on single crystal quartz samples and will be followed by experiments on single crystals of 1,3,5,7-Tetranitro-1,3,5,7-tetrazocane (HMX). Implementing RT with laser driven flyer plates will enable benchtop temperature measurements on many micron-scale samples under multiple impact conditions with nanosecond time resolution. We will compare shocked temperatures from benchtop experiments to gas gun experiments which will extend our temperature measurements into longer time and length scales. Ultimately, we aim for these data to provide the vital, yet elusive, experimental temperatures needed to validate current reactive burn models and aid in creating next-generation models.