Time-resolved absorption in cryogenic and room-temperature

W. Seka; D. H. Edgell; J. P. Knauer; J. F. Myatt; A. V. Maximov; R. W. Short; T. C. Sangster; C. Stoeckl; R. E. Bahr; R. S. Craxton; J. A. Delettrez; V. N. Goncharov; I. V. Igumenshchev; D. Shvarts

doi:10.1063/1.2898405

Time-resolved absorption in cryogenic and room-temperature

W. Seka, D. H. Edgell, J. P. Knauer, J. F. Myatt, A. V. Maximov, R. W. Short, T. C. Sangster, C. Stoeckl, R. E. Bahr, R. S. Craxton, J. A. Delettrez, V. N. Goncharov, I. V. Igumenshchev, D. Shvarts

Department of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

64 Scopus citations

Abstract

Time-dependent and time-integrated absorption fractions are inferred from scattered-light measurements in room-temperature and cryogenic direct-drive-implosion experiments on OMEGA. The measurements agree reasonably well with hydrodynamic simulations that include nonlocal electron-heat transport. Discrepancies in the time-resolved scattered-light spectra between simulations and experiments remain for complex laser pulse shapes, indicating beam-to-beam energy transfer and commensurate coupling losses. Time-resolved scattered-light spectra near ω2 and 3ω2 as well as time-resolved hard-x-ray measurements indicate the presence of a strongly driven two-plasmon-decay (TPD) instability at high intensities that may influence the observed laser light absorption. Experiments indicate that energetic electron production due to the TPD instability can be mitigated with high- Z -doped plastic shells.

Original language	English
Article number	056312
Journal	Physics of Plasmas
Volume	15
Issue number	5
DOIs	https://doi.org/10.1063/1.2898405
State	Published - 9 Jun 2008

ASJC Scopus subject areas

Condensed Matter Physics

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@article{4fe34b5c7c5e47299e52dfb2e43c6842,

title = "Time-resolved absorption in cryogenic and room-temperature",

abstract = "Time-dependent and time-integrated absorption fractions are inferred from scattered-light measurements in room-temperature and cryogenic direct-drive-implosion experiments on OMEGA. The measurements agree reasonably well with hydrodynamic simulations that include nonlocal electron-heat transport. Discrepancies in the time-resolved scattered-light spectra between simulations and experiments remain for complex laser pulse shapes, indicating beam-to-beam energy transfer and commensurate coupling losses. Time-resolved scattered-light spectra near ω2 and 3ω2 as well as time-resolved hard-x-ray measurements indicate the presence of a strongly driven two-plasmon-decay (TPD) instability at high intensities that may influence the observed laser light absorption. Experiments indicate that energetic electron production due to the TPD instability can be mitigated with high- Z -doped plastic shells.",

author = "W. Seka and Edgell, {D. H.} and Knauer, {J. P.} and Myatt, {J. F.} and Maximov, {A. V.} and Short, {R. W.} and Sangster, {T. C.} and C. Stoeckl and Bahr, {R. E.} and Craxton, {R. S.} and Delettrez, {J. A.} and Goncharov, {V. N.} and Igumenshchev, {I. V.} and D. Shvarts",

note = "Funding Information: This work was supported by the U.S. Department of Energy Office of Inertial Confinement Fusion under Cooperative Agreement No. DE-FC52-08NA28302 and the University of Rochester. The support of DOE does not constitute an endorsement by DOE of the views expressed in this article.",

year = "2008",

month = jun,

day = "9",

doi = "10.1063/1.2898405",

language = "English",

volume = "15",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

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TY - JOUR

T1 - Time-resolved absorption in cryogenic and room-temperature

AU - Seka, W.

AU - Edgell, D. H.

AU - Knauer, J. P.

AU - Myatt, J. F.

AU - Maximov, A. V.

AU - Short, R. W.

AU - Sangster, T. C.

AU - Stoeckl, C.

AU - Bahr, R. E.

AU - Craxton, R. S.

AU - Delettrez, J. A.

AU - Goncharov, V. N.

AU - Igumenshchev, I. V.

AU - Shvarts, D.

N1 - Funding Information: This work was supported by the U.S. Department of Energy Office of Inertial Confinement Fusion under Cooperative Agreement No. DE-FC52-08NA28302 and the University of Rochester. The support of DOE does not constitute an endorsement by DOE of the views expressed in this article.

PY - 2008/6/9

Y1 - 2008/6/9

N2 - Time-dependent and time-integrated absorption fractions are inferred from scattered-light measurements in room-temperature and cryogenic direct-drive-implosion experiments on OMEGA. The measurements agree reasonably well with hydrodynamic simulations that include nonlocal electron-heat transport. Discrepancies in the time-resolved scattered-light spectra between simulations and experiments remain for complex laser pulse shapes, indicating beam-to-beam energy transfer and commensurate coupling losses. Time-resolved scattered-light spectra near ω2 and 3ω2 as well as time-resolved hard-x-ray measurements indicate the presence of a strongly driven two-plasmon-decay (TPD) instability at high intensities that may influence the observed laser light absorption. Experiments indicate that energetic electron production due to the TPD instability can be mitigated with high- Z -doped plastic shells.

AB - Time-dependent and time-integrated absorption fractions are inferred from scattered-light measurements in room-temperature and cryogenic direct-drive-implosion experiments on OMEGA. The measurements agree reasonably well with hydrodynamic simulations that include nonlocal electron-heat transport. Discrepancies in the time-resolved scattered-light spectra between simulations and experiments remain for complex laser pulse shapes, indicating beam-to-beam energy transfer and commensurate coupling losses. Time-resolved scattered-light spectra near ω2 and 3ω2 as well as time-resolved hard-x-ray measurements indicate the presence of a strongly driven two-plasmon-decay (TPD) instability at high intensities that may influence the observed laser light absorption. Experiments indicate that energetic electron production due to the TPD instability can be mitigated with high- Z -doped plastic shells.

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U2 - 10.1063/1.2898405

DO - 10.1063/1.2898405

M3 - Article

AN - SCOPUS:44649203324

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VL - 15

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5

M1 - 056312

ER -

Time-resolved absorption in cryogenic and room-temperature

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