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Title: Investigation of the hydrodynamics and emission of a laser heated tamped high-Z target

Abstract

We examine the hydrodynamic expansion and x-ray emission of a laser-heated buried-layer target. This research is motivated by our interest in developing an experimental platform for probing plasma properties under relatively uniform conditions, such as ionization and equation of state. Targets consist of a few thousand angstrom-thick layer of material, embedded in a few microns of the tamper material (typically beryllium), which are irradiated on both sides by an intense few-nanosecond laser pulse. The expansion and emission of our target, composed of a homogeneous mixture of iron, vanadium, and gold, are simulated using the 2-D LASNEX code. Reasonable agreement is found with the time history of the x-ray emission traces (DANTE). Both experiments and simulations exhibit an interesting reduction in the radial size of the emission region with time, as measured using face-on imaging. This is demonstrated to be due to the ablation of the beryllium tamper, which affects the radial confinement of the embedded target. Simulations using a larger diameter beryllium tamper are found to mitigate this effect, improving the one-dimensionality of the expansion.

Authors:
 [1];  [2]; ORCiD logo [2];  [2];  [2]; ORCiD logo [2];  [2];  [2];  [2];  [2]; ORCiD logo [2]
  1. Univ. of Michigan, Ann Arbor, MI (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); General Atomics
OSTI Identifier:
1527280
Alternate Identifier(s):
OSTI ID: 1439533
Report Number(s):
[LLNL-JRNL-744018]
[Journal ID: ISSN 1070-664X; 898078]
Grant/Contract Number:  
[AC52-07NA27344; DEAC52-07NA27344]
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
[ Journal Volume: 25; Journal Issue: 6]; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Gray, William J., Foord, Mark E., Schneider, Marilyn B., Barrios, Maria A., Brown, Greg V., Heeter, Robert F., Jarrott, L. Charlie, Liedahl, Duane A., Marley, Ed V., Mauche, Chris W., and Widmann, Klaus. Investigation of the hydrodynamics and emission of a laser heated tamped high-Z target. United States: N. p., 2018. Web. doi:10.1063/1.5022169.
Gray, William J., Foord, Mark E., Schneider, Marilyn B., Barrios, Maria A., Brown, Greg V., Heeter, Robert F., Jarrott, L. Charlie, Liedahl, Duane A., Marley, Ed V., Mauche, Chris W., & Widmann, Klaus. Investigation of the hydrodynamics and emission of a laser heated tamped high-Z target. United States. doi:10.1063/1.5022169.
Gray, William J., Foord, Mark E., Schneider, Marilyn B., Barrios, Maria A., Brown, Greg V., Heeter, Robert F., Jarrott, L. Charlie, Liedahl, Duane A., Marley, Ed V., Mauche, Chris W., and Widmann, Klaus. Wed . "Investigation of the hydrodynamics and emission of a laser heated tamped high-Z target". United States. doi:10.1063/1.5022169. https://www.osti.gov/servlets/purl/1527280.
@article{osti_1527280,
title = {Investigation of the hydrodynamics and emission of a laser heated tamped high-Z target},
author = {Gray, William J. and Foord, Mark E. and Schneider, Marilyn B. and Barrios, Maria A. and Brown, Greg V. and Heeter, Robert F. and Jarrott, L. Charlie and Liedahl, Duane A. and Marley, Ed V. and Mauche, Chris W. and Widmann, Klaus},
abstractNote = {We examine the hydrodynamic expansion and x-ray emission of a laser-heated buried-layer target. This research is motivated by our interest in developing an experimental platform for probing plasma properties under relatively uniform conditions, such as ionization and equation of state. Targets consist of a few thousand angstrom-thick layer of material, embedded in a few microns of the tamper material (typically beryllium), which are irradiated on both sides by an intense few-nanosecond laser pulse. The expansion and emission of our target, composed of a homogeneous mixture of iron, vanadium, and gold, are simulated using the 2-D LASNEX code. Reasonable agreement is found with the time history of the x-ray emission traces (DANTE). Both experiments and simulations exhibit an interesting reduction in the radial size of the emission region with time, as measured using face-on imaging. This is demonstrated to be due to the ablation of the beryllium tamper, which affects the radial confinement of the embedded target. Simulations using a larger diameter beryllium tamper are found to mitigate this effect, improving the one-dimensionality of the expansion.},
doi = {10.1063/1.5022169},
journal = {Physics of Plasmas},
number = [6],
volume = [25],
place = {United States},
year = {2018},
month = {5}
}

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Free Publicly Available Full Text
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Figures / Tables:

FIG. 1 FIG. 1: Simulated target for Sim1. Left Panel: Edge-on and Right Panel: Face-on. The inner circle represents the iron, vanadium, and gold foil while the outer circle is the beryllium tamper.

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