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Title: Dynamic Compression #2: Laser-Driven Experiments

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1415552
Report Number(s):
LLNL-CONF-743351
DOE Contract Number:
AC52-07NA27344
Resource Type:
Conference
Resource Relation:
Conference: Presented at: AIRAPT, Summer School, Beijing, China, Aug 16 - Aug 18, 2017
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 42 ENGINEERING

Citation Formats

Eggert, J. Dynamic Compression #2: Laser-Driven Experiments. United States: N. p., 2017. Web.
Eggert, J. Dynamic Compression #2: Laser-Driven Experiments. United States.
Eggert, J. 2017. "Dynamic Compression #2: Laser-Driven Experiments". United States. doi:. https://www.osti.gov/servlets/purl/1415552.
@article{osti_1415552,
title = {Dynamic Compression #2: Laser-Driven Experiments},
author = {Eggert, J},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 8
}

Conference:
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  • We demonstrate the recently developed technique of laser driven isentropic compression (ICE) for dynamically compressing Al samples at high loading rates close to the room temperature isentrope and up to peak stresses above 100GPa. Upon analysis of the unloading profiles from a multi-stepped Al/LiF target a continuous path through Stress-Density space may be calculated. For materials with phase transformations ramp compression techniques reveals the location of equilibrium phase boundaries and provide information on the kinetics of the lattice re-ordering.
  • The measurement of compression is described in the context of the Inertial Confinement Fusion Program's transition from thin walled exploding pusher targets, to thicker walled targets which are designed to lead the way towards ablative type implosions which will result in higher fuel density and rho R at burn time. Several general aspects relating to the current state of affairs in compression experiments are discussed.
  • Laser shock compression experiments on precompressed samples offer the possibility to explore extreme material states unreachable by static or single-shock compression techniques alone. We have found significant increases in static compression pressure in a wide-opening and thin diamond precompression cell. This suggests that the precompression target is adaptable to advanced coupling techniques with laser-driven dynamic compression methods. The novel coupling techniques proposed give the potential to access outstanding material states required in planetary and condensed-matter physics.
  • Using the Los Alamos high explosive pulsed power (HEPP) system, isentropic equation of state (EOS) data may be obtained for a wide range of materials. Current pulses with risetimes of {approx}500 ns and current densities exceeding 400 MA/m, create continuous magnetic loading of samples at megabar pressures. We will summarize the technique and the problems that had to be overcome to perform the HEPP-ICE experiments at these pressures. We will then present our EOS results obtained with the conventional Lagrangian analysis and the Hayes 'Backward' integration method, and compare the data with the published principal isentrope of OFHC copper.
  • Abstract not provided.