Radiation effects of hydrodynamic perturbation growth due to non-uniform laser irradiation

Naofumi Ohnishi, Hideo Nagatomo, Hiroaki Nishimura, Hideaki Takabe, Tatsuhiko Yamanaka

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The initial imprint caused by the spatial non-uniformity of laser intensity which generates a mass perturbation is one of the critical issues for directly driven laser fusion research. To mitigate such laser imprint a foam-hybrid target, which has low-density foam layer and is coated with high-Z material, was proposed. In such targets, the X-ray radiation plays a significant role in the formation of the initial imprint. For short wavelength perturbations, a clear suppression of the perturbation growth is observed in the foam-hybrid target. The perturbation growth is reduced by radiation preheating since the ablation surface is smoothed. Moreover, the emitted X-rays from the coated high-Z material suppresses the hydrodynamic instability at the interface of plastic and foam. However, the ablation structure is sensitive to the opacity model. Thus, it is important to analyze the role different radiation models play in the hydrodynamics. In this work we will compare both CRE and LTE models.

Original languageEnglish
Pages (from-to)551-560
Number of pages10
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Volume71
Issue number2-6
DOIs
Publication statusPublished - 2001 Oct 15

Keywords

  • Hydrodynamicc instability
  • Inertial confinement fusion
  • Laser imprint
  • Radiation hydrodynamics
  • Shock wave
  • X-ray radiation

ASJC Scopus subject areas

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy

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