Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session YO05: ICF: Equations of State
9:30 AM–12:06 PM,
Friday, October 21, 2022
Room: Ballroom 111 B
Chair: Marius Millot, LLNL; Arijit Bose, University of Delaware
Abstract: YO05.00010 : Stagnating Plasma Piston: A New Method to Measure Thermal Conductivity at Planetary Core Conditions
11:18 AM–11:30 AM
Presenter:
Tyler M Perez
(Johns Hopkins University)
Authors:
Tyler M Perez
(Johns Hopkins University)
June K Wicks
(Johns Hopkins University)
Raymond F Smith
(Lawrence Livermore Natl Lab)
Patrick LaChapelle
(Johns Hopkins University)
Jon H Eggert
(Lawrence Livermore Natl Lab)
Dayne E Fratanduono
(Lawrence Livermore Natl Lab)
Yuan Ping
(Lawrence Livermore Natl Lab)
Connor Krill
(Johns Hopkins University)
At the OMEGA laser at the Laboratory for Laser Energetics (LLE), we use the stagnating plasma-piston compression technique to smoothly and quasi-isentropically compress iron samples up to 190 GPa while simultaneously sending a >20,000 K thermal pulse through the sample. Each sample consists of three planar targets of different thicknesses arranged in a stair-step shape. By using a streaked optical pyrometer (SOP), we obtain time-resolved thermal emission curves from each step thickness on the side opposite to the heat source. To analyze the data, we compare the results to the output from a finite element code (FEniCS) that models the thermal pulse as a square wave temperature boundary condition and models the compression with uniform mesh shortening and density increase. The finite element model is put through a differential evolution minimization algorithm to find the best thermal conductivity parameters and the timing and temperature of the thermal boundary condition. Hydrocode simulations of the plasma-piston setup help constrain this boundary condition. Initial results suggest a moderately high value for thermal conductivity compared to most other experimental studies.
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