Hanex Simulations of Laser-Target Interactions: 1. Radiation Processes

Abstract

Numerical simulations of the laser-target interaction and subsequent plasma blowoff expansion for the PHAROS III experiment are presented using the HANEX code. This report emphasize the properties of the radiation field and the photo-absorption physics in the background gas. The multi-frequency radiation transport technique employed in HANEX is fully described. Likewise, the phenomenological treatment in HANEX for the ionization, dissociation, and heating in the background gas resulting from radiation deposition is presented. The evolution of the background due to radiation deposition is studied from the time of the peak of the laser pulse to 60 nsec later. Model spectra of the heated plasma blowoff predict strong emission lines from highly ionized nitrogen and aluminum in the cavity. Keywords: Laser plasmas, Blast waves, Photo-chemistry, Radiation.

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Document Details

Document Type
Technical Report
Publication Date
Jun 08, 1988
Accession Number
ADA197965

Entities

People

  • Ellis Hyman
  • John L. Giulliani Jr.
  • Margaret Mulbradon

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Blast
  • Blast Waves
  • Chemistry
  • Classification
  • Dissociation
  • Electrons
  • Energy
  • Energy Transfer
  • Frequency
  • Ionization
  • Laser Pulses
  • Laser Target Interactions
  • Laser Targets
  • Physics Laboratories
  • Security
  • Simulations
  • Spectra

Fields of Study

  • Physics

Readers

  • Molecular Photonics/Laser Physics
  • Pulsed Power and Plasma Physics.

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers