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Title: Understanding the effects of radiative preheat and self-emission from shock heating on equation of state measurement at 100s of Mbar using spherically converging shock waves in a NIF hohlraum

Abstract

Over the last six years many experiments have been done at the National Ignition Facility to measure the Hugoniot of materials, such as CH plastic at extreme pressures, up to 800 Mbar. The “Gbar” design employs a strong spherically converging shock launched through a solid ball of material using a hohlraum radiation drive. Here, the shock front conditions are characterized using x-ray radiography. In this paper we examine the role of radiation in heating the unshocked material in front of the shock to understand the impact it has on equation of state measurements and how it drives the measured data off the theoretical Hugoniot curve. In particular, the two main sources of radiation heating are the preheating of the unshocked material by the high-energy kilo-electron-volt x-rays in the hohlraum and the heating of the material in front of the shock, as the shocked material becomes hot enough to radiate significantly. Using our model, we estimate that preheating can reach 4 eV in unshocked material, and that radiation heating can begin to drive data off the Hugoniot significantly, as pressures reach above 400 Mb.

Authors:
ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [2]; ORCiD logo [3];  [4]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Rochester, NY (United States)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1581494
Alternate Identifier(s):
OSTI ID: 1634006
Report Number(s):
LLNL-JRNL-781432
Journal ID: ISSN 2468-2047; TRN: US2201284
Grant/Contract Number:  
AC02-76SF00515; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Matter and Radiation at Extremes
Additional Journal Information:
Journal Volume: 5; Journal Issue: 1; Journal ID: ISSN 2468-2047
Publisher:
China Academy of Engineering Physics (CAEP)/AIP Publishing
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Physical radiation effects; Shock waves; Plasma heating; Hugoniot curve; Radiography; Black body radiation; Equations of state; Atomic and molecular physics; Hydrodynamics simulations

Citation Formats

Nilsen, Joseph, Kritcher, Andrea L., Martin, Madison E., Tipton, Robert E., Whitley, Heather D., Swift, Damian C., Döppner, Tilo, Bachmann, Benjamin L., Lazicki, Amy E., Kostinski, Natalie B., Maddox, Brian R., Collins, Gilbert W., Glenzer, Siegfried H., and Falcone, Roger W. Understanding the effects of radiative preheat and self-emission from shock heating on equation of state measurement at 100s of Mbar using spherically converging shock waves in a NIF hohlraum. United States: N. p., 2019. Web. doi:10.1063/1.5131748.
Nilsen, Joseph, Kritcher, Andrea L., Martin, Madison E., Tipton, Robert E., Whitley, Heather D., Swift, Damian C., Döppner, Tilo, Bachmann, Benjamin L., Lazicki, Amy E., Kostinski, Natalie B., Maddox, Brian R., Collins, Gilbert W., Glenzer, Siegfried H., & Falcone, Roger W. Understanding the effects of radiative preheat and self-emission from shock heating on equation of state measurement at 100s of Mbar using spherically converging shock waves in a NIF hohlraum. United States. https://doi.org/10.1063/1.5131748
Nilsen, Joseph, Kritcher, Andrea L., Martin, Madison E., Tipton, Robert E., Whitley, Heather D., Swift, Damian C., Döppner, Tilo, Bachmann, Benjamin L., Lazicki, Amy E., Kostinski, Natalie B., Maddox, Brian R., Collins, Gilbert W., Glenzer, Siegfried H., and Falcone, Roger W. Tue . "Understanding the effects of radiative preheat and self-emission from shock heating on equation of state measurement at 100s of Mbar using spherically converging shock waves in a NIF hohlraum". United States. https://doi.org/10.1063/1.5131748. https://www.osti.gov/servlets/purl/1581494.
@article{osti_1581494,
title = {Understanding the effects of radiative preheat and self-emission from shock heating on equation of state measurement at 100s of Mbar using spherically converging shock waves in a NIF hohlraum},
author = {Nilsen, Joseph and Kritcher, Andrea L. and Martin, Madison E. and Tipton, Robert E. and Whitley, Heather D. and Swift, Damian C. and Döppner, Tilo and Bachmann, Benjamin L. and Lazicki, Amy E. and Kostinski, Natalie B. and Maddox, Brian R. and Collins, Gilbert W. and Glenzer, Siegfried H. and Falcone, Roger W.},
abstractNote = {Over the last six years many experiments have been done at the National Ignition Facility to measure the Hugoniot of materials, such as CH plastic at extreme pressures, up to 800 Mbar. The “Gbar” design employs a strong spherically converging shock launched through a solid ball of material using a hohlraum radiation drive. Here, the shock front conditions are characterized using x-ray radiography. In this paper we examine the role of radiation in heating the unshocked material in front of the shock to understand the impact it has on equation of state measurements and how it drives the measured data off the theoretical Hugoniot curve. In particular, the two main sources of radiation heating are the preheating of the unshocked material by the high-energy kilo-electron-volt x-rays in the hohlraum and the heating of the material in front of the shock, as the shocked material becomes hot enough to radiate significantly. Using our model, we estimate that preheating can reach 4 eV in unshocked material, and that radiation heating can begin to drive data off the Hugoniot significantly, as pressures reach above 400 Mb.},
doi = {10.1063/1.5131748},
journal = {Matter and Radiation at Extremes},
number = 1,
volume = 5,
place = {United States},
year = {2019},
month = {12}
}

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Figures / Tables:

FIG. 1 FIG. 1: (a) Schematic of the solid spherical CH target with Ge-doped GDP ablator used in the Gbar experiments. (b) Schematic of the experimental setup. Solid spherical target of CH is shock compressed using a hohlraum radiation drive, then backlit with∼9 keV Zn He-α x-rays to generate a time-resolved (“streaked”)more » 1D image of the shock compression vs time. (c) Radiograph for the 9-keV x-ray backlighter vs time and radius, showing the shock wave converging to the central hot-spot. The vertical axis covers 8 ns and the horizontal axis covers a diameter of 0.2 cm. Details of the experiment are in Ref. 5.« less

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