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

Research output: Contribution to journalArticlepeer-review

63 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 languageEnglish
Article number056312
JournalPhysics of Plasmas
Volume15
Issue number5
DOIs
StatePublished - 9 Jun 2008

ASJC Scopus subject areas

  • Condensed Matter Physics

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