High pressure, quasi-isentropic compression experiments on the Omega laser

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The high energy density of pulsed lasers can be used to generate shockless loading in solids to high pressures and compressions but low temperatures. We have used the Omega laser to extend the capabilities of this technique to multi-Mbar pressures and compressions approaching a factor of 2 in aluminum foils. The energy from a 3.7 ns laser pulse is used to drive a strong shock through a 200 {micro}m polystyrene disc. The disc material unloads from a high-pressure state and expands across a 300 {micro}m vacuum gap where it stagnates against the sample to produce a smooth, monotonically increasing load ... continued below

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Lorenz, K; Edwards, M; Jankowski, A; Pollaine, S; Smith, R & Remington, B May 26, 2006.

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The high energy density of pulsed lasers can be used to generate shockless loading in solids to high pressures and compressions but low temperatures. We have used the Omega laser to extend the capabilities of this technique to multi-Mbar pressures and compressions approaching a factor of 2 in aluminum foils. The energy from a 3.7 ns laser pulse is used to drive a strong shock through a 200 {micro}m polystyrene disc. The disc material unloads from a high-pressure state and expands across a 300 {micro}m vacuum gap where it stagnates against the sample to produce a smooth, monotonically increasing load with rise times from a few to {approx} 20 ns. Ramped compression reasing waves having peak pressures of 14-200 GPa (0.14-2.0 Mbar) and peak compressions {rho}/{rho}{sub 0} of 1.1-2.0 were generated in the aluminum samples using laser pulse energies of 400 J to 2 kJ. Wave profiles from a series of successively thicker targets loaded to 120 GPa show the evolution of the high-pressure compression wave within the sample. The initial loading in the sample is shockless, and develops into a shock at a depth of 20-25 {micro}m. We compare these wave profiles with hydrodynamic simulations from which we extract material temperatures and plastic strain rates behind the compression wave. Limitations and future prospects for this new shockless loading technique are discussed.

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  • Journal Name: Elsevier Journal, High Energy Density Physics, vol. 2, n/a, August 28, 2006, pp. 113-125; Journal Volume: 2

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  • Report No.: UCRL-JRNL-221984
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 895434
  • Archival Resource Key: ark:/67531/metadc881646

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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.

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  • May 26, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 29, 2016, 12:37 p.m.

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Lorenz, K; Edwards, M; Jankowski, A; Pollaine, S; Smith, R & Remington, B. High pressure, quasi-isentropic compression experiments on the Omega laser, article, May 26, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc881646/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.