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

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:
;
Publication Date:
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; 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.
Colvin, J D, & Kalantar, D H. Scaling of Pressure with Intensity in Laser-Driven Shocks and Effects of Hot X-ray Preheat. United States. doi:10.1063/1.2263589.
Colvin, J D, and Kalantar, D H. Mon . "Scaling of Pressure with Intensity in Laser-Driven Shocks and Effects of Hot X-ray Preheat". United States. doi:10.1063/1.2263589. https://www.osti.gov/servlets/purl/883506.
@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},
journal = {},
number = ,
volume = 845,
place = {United States},
year = {Mon Aug 29 00:00:00 EDT 2005},
month = {Mon Aug 29 00:00:00 EDT 2005}
}

Conference:
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