Scaling of Pressure with Intensity in Laser-Driven Shocks and Effects of Hot X-ray Preheat

Colvin, J D; Kalantar, D H

doi:10.1063/1.2263589

Title: Scaling of Pressure with Intensity in Laser-Driven Shocks and Effects of Hot X-ray Preheat

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Abstract

To drive shocks into solids with a laser we either illuminate the material directly, or to get higher pressures, illuminate a plastic ablator that overlays the material of interest. In both cases the illumination intensity is low, <<10{sup 13} W/cm{sup 2}, compared to that for traditional laser fusion targets. In this regime, the laser beam creates and interacts with a collisional, rather than a collisionless, plasma. We present scaling relationships for shock pressure with intensity derived from simulations for this low-intensity collisional plasma regime. In addition, sometimes the plastic-ablator targets have a thin flashcoating of Al on the plastic surface as a shine-through barrier; this Al layer can be a source of hot x-ray preheat. We discuss how the preheat affects the shock pressure, with application to simulating VISAR measurements from experiments conducted on various lasers on shock compression of Fe.

Authors:: Colvin, J D; Kalantar, D H

Publication Date:: Mon Aug 29 00:00:00 EDT 2005

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 883506

Report Number(s):: UCRL-CONF-215123
Journal ID: ISSN 0094-243X; IM #324333; TRN: US200615%%76

DOE Contract Number:: W-7405-ENG-48

Resource Type:: Conference

Resource Relation:: Journal Volume: 845; Conference: Presented at: American Physical Society Topical Conference on Shock Compression of Condensed Matter, Baltimore, MD, United States, Jul 31 - Aug 05, 2005

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COLLISIONAL PLASMA; COMPRESSION; ILLUMINANCE; LASERS; PLASMA; PLASTICS; TARGETS

Citation Formats


                    Colvin, J D, and Kalantar, D H. Scaling of Pressure with Intensity in Laser-Driven Shocks and Effects of Hot X-ray Preheat.  United States: N. p., 2005. 
        Web.  doi:10.1063/1.2263589.

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                    Colvin, J D, & Kalantar, D H. Scaling of Pressure with Intensity in Laser-Driven Shocks and Effects of Hot X-ray Preheat.  United States.  https://doi.org/10.1063/1.2263589

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                    Colvin, J D, and Kalantar, D H. 2005.  
        "Scaling of Pressure with Intensity in Laser-Driven Shocks and Effects of Hot X-ray Preheat".  United States.  https://doi.org/10.1063/1.2263589.  https://www.osti.gov/servlets/purl/883506.

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@article{osti_883506,

  title        = {Scaling of Pressure with Intensity in Laser-Driven Shocks and Effects of Hot X-ray Preheat},

  author       = {Colvin, J D and Kalantar, D H},

  abstractNote = {To drive shocks into solids with a laser we either illuminate the material directly, or to get higher pressures, illuminate a plastic ablator that overlays the material of interest. In both cases the illumination intensity is low, <<10{sup 13} W/cm{sup 2}, compared to that for traditional laser fusion targets. In this regime, the laser beam creates and interacts with a collisional, rather than a collisionless, plasma. We present scaling relationships for shock pressure with intensity derived from simulations for this low-intensity collisional plasma regime. In addition, sometimes the plastic-ablator targets have a thin flashcoating of Al on the plastic surface as a shine-through barrier; this Al layer can be a source of hot x-ray preheat. We discuss how the preheat affects the shock pressure, with application to simulating VISAR measurements from experiments conducted on various lasers on shock compression of Fe.},

  doi          = {10.1063/1.2263589},

  url          = {https://www.osti.gov/biblio/883506},
  journal      = {},

  issn         = {0094-243X},

  number       = ,

  volume       = 845,

  place        = {United States},

  year         = {Mon Aug 29 00:00:00 EDT 2005},

  month        = {Mon Aug 29 00:00:00 EDT 2005}

}

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