Experiments and simulations of isochorically heated warm dense carbon foam at the Texas Petawatt Laser

An experimental and simulation study of warm dense carbon foams at ambient density (ne ∼ 1021 cm−3) is presented. This study of isochorically heated foams is motivated by their potential application in carbon-atmosphere white-dwarf envelopes, where there are modeling uncertainties due to the equation of state. The foams are heated on an approximately picosecond time scale with a laser-accelerated proton beam. The cooling and expansion of the heated foams can be modeled with appropriately initialized radiation-hydrodynamics codes; xRAGE code is used in this work. The primary experimental diagnostic is the streaked optical pyrometer, which images a narrow band of radiation from the rear surface of the heated material. Presented are xRAGE modeling results for both solid aluminum targets and carbonized resorcinol-formaldehyde foam targets, showing that the foam appears to cool slowly on the pyrometer because of partial transparency. So that simulations of cooling foam are processed properly, it is necessary to account for finite optical depth in the photosphere calculation, and the methods for performing that calculation are presented in depth.

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Details

Published: Dec 15, 2020
Vol/Issue: 6(1)

Authors

R

R. Roycroft

The University of Texas at Austin 1 , Austin, Texas 78712,; Los Alamos National Laboratory 2 , Los Alamos, New Mexico 87545,

P

P. A. Bradley

Los Alamos National Laboratory 2 , Los Alamos, New Mexico 87545,

E

E. McCary

The University of Texas at Austin 1 , Austin, Texas 78712,

B

B. Bowers

The University of Texas at Austin 1 , Austin, Texas 78712,

H

H. Smith

The University of Texas at Austin 1 , Austin, Texas 78712,

G

G. M. Dyer

SLAC National Accelerator Laboratory 3 , Menlo Park, California 94025,

B

B. J. Albright

Los Alamos National Laboratory 2 , Los Alamos, New Mexico 87545,

S

S. Blouin

Los Alamos National Laboratory 2 , Los Alamos, New Mexico 87545,

P

P. Hakel

Los Alamos National Laboratory 2 , Los Alamos, New Mexico 87545,

H

H. J. Quevedo

The University of Texas at Austin 1 , Austin, Texas 78712,

E

E. L. Vold

Los Alamos National Laboratory 2 , Los Alamos, New Mexico 87545,

L

L. Yin

Los Alamos National Laboratory 2 , Los Alamos, New Mexico 87545,

B

B. M. Hegelich

The University of Texas at Austin 1 , Austin, Texas 78712,

Funding

Air Force Office of Scientific Research Award: FA9550-14-1-0045

NNSA Cooperative Agreement Award: DE-NA0002008

DARPA-PULSE Award: 12-63- PULSE-FP014

Cite This Article

R. Roycroft, P. A. Bradley, E. McCary, et al. (2020). Experiments and simulations of isochorically heated warm dense carbon foam at the Texas Petawatt Laser. Matter and Radiation at Extremes, 6(1). https://doi.org/10.1063/5.0026595

Experiments and simulations of isochorically heated warm dense carbon foam at the Texas Petawatt Laser

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