Speaker
Dr
William Evans
(Lawrence Livermore Natl Laboratory)
Description
We have developed a unique device, a dynamic diamond anvil cell (dDAC), which repetitively applies a time-dependent load/pressure profile to a sample. We are adapting this device to pulsed synchrotron radiation to time-resolve and take "snapshots" of pressure-induced transitions and phenomena. This capability allows studies of the kinetics of phase transitions and metastable phases at compression strain rates of up to 500 GPa/sec (~0.16 s-1 for a metal). Our approach adapts electromechanical piezoelectric actuators to a conventional diamond anvil cell design, which enables precise specification and control of a time-dependent applied load/pressure. This capability addresses the sparsely studied regime of dynamic phenomena between static research and dynamic shock-driven experiments. We present an overview of our work and experimental measurements that can be made with this device.
This work performed under the auspices of the US DOE by LLNL under Contract DE-AC52-07NA27344. HPCAT use is supported by DOE-BES, DOE-NNSA, NSF, and the W.M. Keck Foundation. APS is supported by DOE-BES, under Contract No. DE-AC02-06CH11357.
Primary author
Dr
William Evans
(Lawrence Livermore Natl Laboratory)
Co-authors
Dr
Hyunchae Cynn
(Lawrence Livermore Natl Laboratory)
Dr
Magnus Lipp
(Lawrence Livermore Natl Laboratory)
