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

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 equatio...

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Main Authors: R. Roycroft, P. A. Bradley, E. McCary, B. Bowers, H. Smith, G. M. Dyer, B. J. Albright, S. Blouin, P. Hakel, H. J. Quevedo, E. L. Vold, L. Yin, B. M. Hegelich
Format: Article
Language:English
Published: AIP Publishing LLC 2021-01-01
Series:Matter and Radiation at Extremes
Online Access:http://dx.doi.org/10.1063/5.0026595
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spelling doaj-aa613d8d5aff4366b2634599e71c23202021-02-02T21:33:07ZengAIP Publishing LLCMatter and Radiation at Extremes2468-080X2021-01-0161014403014403-1010.1063/5.0026595Experiments and simulations of isochorically heated warm dense carbon foam at the Texas Petawatt LaserR. Roycroft0P. A. Bradley1E. McCary2B. Bowers3H. Smith4G. M. Dyer5B. J. Albright6S. Blouin7P. Hakel8H. J. Quevedo9E. L. Vold10L. Yin11B. M. Hegelich12The University of Texas at Austin, Austin, Texas 78712, USALos Alamos National Laboratory, Los Alamos, New Mexico 87545, USAThe University of Texas at Austin, Austin, Texas 78712, USAThe University of Texas at Austin, Austin, Texas 78712, USAThe University of Texas at Austin, Austin, Texas 78712, USASLAC National Accelerator Laboratory, Menlo Park, California 94025, USALos Alamos National Laboratory, Los Alamos, New Mexico 87545, USALos Alamos National Laboratory, Los Alamos, New Mexico 87545, USALos Alamos National Laboratory, Los Alamos, New Mexico 87545, USAThe University of Texas at Austin, Austin, Texas 78712, USALos Alamos National Laboratory, Los Alamos, New Mexico 87545, USALos Alamos National Laboratory, Los Alamos, New Mexico 87545, USAThe University of Texas at Austin, Austin, Texas 78712, USAAn 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.http://dx.doi.org/10.1063/5.0026595
collection DOAJ
language English
format Article
sources DOAJ
author R. Roycroft
P. A. Bradley
E. McCary
B. Bowers
H. Smith
G. M. Dyer
B. J. Albright
S. Blouin
P. Hakel
H. J. Quevedo
E. L. Vold
L. Yin
B. M. Hegelich
spellingShingle R. Roycroft
P. A. Bradley
E. McCary
B. Bowers
H. Smith
G. M. Dyer
B. J. Albright
S. Blouin
P. Hakel
H. J. Quevedo
E. L. Vold
L. Yin
B. M. Hegelich
Experiments and simulations of isochorically heated warm dense carbon foam at the Texas Petawatt Laser
Matter and Radiation at Extremes
author_facet R. Roycroft
P. A. Bradley
E. McCary
B. Bowers
H. Smith
G. M. Dyer
B. J. Albright
S. Blouin
P. Hakel
H. J. Quevedo
E. L. Vold
L. Yin
B. M. Hegelich
author_sort R. Roycroft
title Experiments and simulations of isochorically heated warm dense carbon foam at the Texas Petawatt Laser
title_short Experiments and simulations of isochorically heated warm dense carbon foam at the Texas Petawatt Laser
title_full Experiments and simulations of isochorically heated warm dense carbon foam at the Texas Petawatt Laser
title_fullStr Experiments and simulations of isochorically heated warm dense carbon foam at the Texas Petawatt Laser
title_full_unstemmed Experiments and simulations of isochorically heated warm dense carbon foam at the Texas Petawatt Laser
title_sort experiments and simulations of isochorically heated warm dense carbon foam at the texas petawatt laser
publisher AIP Publishing LLC
series Matter and Radiation at Extremes
issn 2468-080X
publishDate 2021-01-01
description 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.
url http://dx.doi.org/10.1063/5.0026595
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