Laser acceleration of thin flyers

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Description

Laser energy delivered through an optical fiber has been used to accelerate a thin metallic foil to high velocity. Subsequent impact of the foil onto an explosive charge can initiate an explosion. The present computational study addresses the physical processes of laser absorption, energy transport flyer acceleration, and foil impact on HE or on diagnostic materials in associated experiments. The objective has been to gain understanding that will allow optimizing the system for practical HE initiation. The structure of the foil, especially the presence of a thermally insulating layer near the ablation surface, significantly influences foil effectiveness as an initiator. ... continued below

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4 p.

Creation Information

Farnsworth, A.V. Jr. August 1, 1995.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 12 times . More information about this report can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Laser energy delivered through an optical fiber has been used to accelerate a thin metallic foil to high velocity. Subsequent impact of the foil onto an explosive charge can initiate an explosion. The present computational study addresses the physical processes of laser absorption, energy transport flyer acceleration, and foil impact on HE or on diagnostic materials in associated experiments. The objective has been to gain understanding that will allow optimizing the system for practical HE initiation. The structure of the foil, especially the presence of a thermally insulating layer near the ablation surface, significantly influences foil effectiveness as an initiator. These simulations show a marked effect on the acceleration process by that layer, which influences both the onset of full laser power absorption, and the physical competence of the foil on arrival at the HE. The effect on laser absorption is especially noteworthy at low laser intensity, where foil launch is marginal. A role of the glass fiber in absorbing laser energy and contributing ablated material is seen in the calculations and confirmed by experiments.

Physical Description

4 p.

Notes

OSTI as DE95016754

Source

  • American Physical Society biennial conference on shock compression of condensed matter, Seattle, WA (United States), 13-18 Aug 1995

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  • Other: DE95016754
  • Report No.: SAND--95-0827C
  • Report No.: CONF-950846--17
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/102212 | External Link
  • Office of Scientific & Technical Information Report Number: 102212
  • Archival Resource Key: ark:/67531/metadc618668

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • August 1, 1995

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

Description Last Updated

  • April 14, 2016, 8:36 p.m.

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Farnsworth, A.V. Jr. Laser acceleration of thin flyers, report, August 1, 1995; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc618668/: accessed June 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.