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
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 so...
| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2020-01-01
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| Series: | Matter and Radiation at Extremes |
| Online Access: | http://dx.doi.org/10.1063/1.5131748 |
| _version_ | 1818501734889160704 |
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| author | Joseph Nilsen Andrea L. Kritcher Madison E. Martin Robert E. Tipton Heather D. Whitley Damian C. Swift Tilo Döppner Benjamin L. Bachmann Amy E. Lazicki Natalie B. Kostinski Brian R. Maddox Gilbert W. Collins Siegfried H. Glenzer Roger W. Falcone |
| author_facet | Joseph Nilsen Andrea L. Kritcher Madison E. Martin Robert E. Tipton Heather D. Whitley Damian C. Swift Tilo Döppner Benjamin L. Bachmann Amy E. Lazicki Natalie B. Kostinski Brian R. Maddox Gilbert W. Collins Siegfried H. Glenzer Roger W. Falcone |
| author_sort | Joseph Nilsen |
| collection | DOAJ |
| description | 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. 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. |
| first_indexed | 2024-12-10T21:00:20Z |
| format | Article |
| id | doaj.art-e89650349eeb4f2d9aef6b4754bb4073 |
| institution | Directory Open Access Journal |
| issn | 2468-080X |
| language | English |
| last_indexed | 2024-12-10T21:00:20Z |
| publishDate | 2020-01-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | Matter and Radiation at Extremes |
| spelling | doaj.art-e89650349eeb4f2d9aef6b4754bb40732022-12-22T01:33:50ZengAIP Publishing LLCMatter and Radiation at Extremes2468-080X2020-01-0151018401018401-710.1063/1.5131748003001MREUnderstanding 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 hohlraumJoseph Nilsen0Andrea L. Kritcher1Madison E. Martin2Robert E. Tipton3Heather D. Whitley4Damian C. Swift5Tilo Döppner6Benjamin L. Bachmann7Amy E. Lazicki8Natalie B. Kostinski9Brian R. Maddox10Gilbert W. Collins11Siegfried H. Glenzer12Roger W. Falcone13Lawrence Livermore National Laboratory, Livermore, California 94551, USALawrence Livermore National Laboratory, Livermore, California 94551, USALawrence Livermore National Laboratory, Livermore, California 94551, USALawrence Livermore National Laboratory, Livermore, California 94551, USALawrence Livermore National Laboratory, Livermore, California 94551, USALawrence Livermore National Laboratory, Livermore, California 94551, USALawrence Livermore National Laboratory, Livermore, California 94551, USALawrence Livermore National Laboratory, Livermore, California 94551, USALawrence Livermore National Laboratory, Livermore, California 94551, USALawrence Livermore National Laboratory, Livermore, California 94551, USALawrence Livermore National Laboratory, Livermore, California 94551, USAUniversity of Rochester, Rochester, New York 14627, USASLAC National Accelerator, Menlo Park, California 94025, USAUniversity of California Berkeley, Berkeley, California 94720, USAOver 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. 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.http://dx.doi.org/10.1063/1.5131748 |
| spellingShingle | Joseph Nilsen Andrea L. Kritcher Madison E. Martin Robert E. Tipton Heather D. Whitley Damian C. Swift Tilo Döppner Benjamin L. Bachmann Amy E. Lazicki Natalie B. Kostinski Brian R. Maddox Gilbert W. Collins Siegfried H. Glenzer Roger W. Falcone 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 Matter and Radiation at Extremes |
| 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| url | http://dx.doi.org/10.1063/1.5131748 |
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