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Title: An automated design process for short pulse laser driven opacity experiments

Journal Article · · High Energy Density Physics
 [1];  [2];  [3];  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Florida, Gainesville, FL (United States). Nuclear Engineering Program. Dept. of Materials Science and Engineering
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of Florida, Gainesville, FL (United States). Nuclear Engineering Program. Dept. of Materials Science and Engineering

Stellar-relevant conditions can be reached by heating a buried layer target with a short pulse laser. Previous design studies of iron buried layer targets found that plasma conditions are dominantly controlled by the laser energy while the accuracy of the inferred opacity is limited by tamper emission and optical depth effects. In this paper, we developed a process to simultaneously optimize laser and target parameters to meet a variety of design goals. We explored two sets of design cases: a set focused on conditions relevant to the upper radiative zone of the sun (electron temperatures of 200 to 400 eV and densities greater than 1/10 of solid density) and a set focused on reaching temperatures consistent with deep within the radiative zone of the sun (500 to 1000 eV) at a fixed density. We found optimized designs for iron targets and determined that the appropriate dopant, for inferring plasma conditions, depends on the goal temperature: magnesium for up to 300 eV, aluminum for 300 to 500 eV, and sulfur for 500 to 1000 eV. The optimal laser energy and buried layer thickness increase with goal temperature. The accuracy of the inferred opacity is limited to between 11% and 31%, depending on the design. Finally, overall, short pulse laser heated iron experiments reaching stellar-relevant conditions have been designed with consideration of minimizing tamper emission and optical depth effects while meeting plasma condition and x-ray emission goals.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1432970
Alternate ID(s):
OSTI ID: 1549014
Report Number(s):
LLNL-JRNL-736425; TRN: US1802801
Journal Information:
High Energy Density Physics, Vol. 26; ISSN 1574-1818
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

References (42)

X‐ray spectroscopic studies of hot, dense iron plasma formed by subpicosecond high intensity KrF laser irradiation journal December 1996
K-shell spectra from hot dense aluminum layers buried in carbon and heated by ultrashort laser pulses journal September 2003
Picosecond Time-Resolved X-Ray Absorption Spectroscopy of Ultrafast Aluminum Plasmas journal January 2005
Heating of buried layer targets by 1ω and 2ω pulses using the HELEN CPA laser journal May 2007
Measurements of emission spectra from hot, dense germanium plasma in short pulse laser experiments journal January 2010
Measurements of Electron Transport in Foils Irradiated with a Picosecond Time Scale Laser Pulse journal May 2011
Observations of the Effect of Ionization-Potential Depression in Hot Dense Plasma journal June 2013
The first data from the Orion laser; measurements of the spectrum of hot, dense aluminium journal December 2013
Measurement of x-ray emission and thermal transport in near-solid-density plasmas heated by 130 fs laser pulses journal October 1998
A comparison of theory and experiment for high density, high temperature germanium spectra journal January 2010
Electron temperature and density characterization using L-shell spectroscopy of laser irradiated buried iron layer targets journal August 2014
Surprising Sun: A New Step Towards a Complete Picture? journal November 2004
Constraining Solar Abundances Using Helioseismology journal April 2004
Helioseismological Implications of Recent Solar Abundance Determinations journal January 2005
New Solar Opacities, Abundances, Helioseismology, and Neutrino Fluxes journal January 2005
On plasma radiative properties in stellar conditions journal September 2009
Helioseismology and solar abundances journal March 2008
The solar chemical composition journal October 2006
Absorption measurements demonstrating the importance of Δ n =0 transitions in the opacity of iron journal July 1992
Spectroscopic absorption measurements of an iron plasma journal December 1992
XUV opacity measurements and comparison with models journal July 1995
Measurements of extreme uv opacities in hot dense Al, Fe, and Ho journal February 1996
Opacity Studies of Iron in the 15–30eV Temperature Range
  • Chenais‐Popovics, Claude; Merdji, Hamed; Missalla, Thomas
  • The Astrophysical Journal Supplement Series, Vol. 127, Issue 2 https://doi.org/10.1086/313354
journal April 2000
Absorption spectroscopy of mid and neighboring Z plasmas: Iron, nickel,copper and germanium journal September 2009
Opacity of iron, nickel, and copper plasmas in the x-ray wavelength range: Theoretical interpretation of 2 p 3 d absorption spectra journal September 2011
Iron-Plasma Transmission Measurements at Temperatures Above 150 eV journal December 2007
Diagnosis of x-ray heated Mg/Fe opacity research plasmas journal November 2008
Experimental investigation of opacity models for stellar interior, inertial fusion, and high energy density plasmas journal May 2009
A higher-than-predicted measurement of iron opacity at solar interior temperatures journal December 2014
Computational design of short pulse laser driven iron opacity experiments journal February 2017
Modelling K shell spectra from short pulse heated buried microdot targets journal June 2017
Failure analysis of parameter-induced simulation crashes in climate models journal January 2013
Three-dimensional HYDRA simulations of National Ignition Facility targets journal May 2001
Advances in NLTE modeling for integrated simulations journal January 2010
A new global equation of state model for hot, dense matter journal September 1995
A new quotidian equation of state (QEOS) for hot dense matter journal January 1988
Model uncertainties of local-thermodynamic-equilibrium K-shell spectroscopy journal September 2016
Fast-electron-relaxation measurement for laser-solid interaction at relativistic laser intensities journal November 2007
Scaling Hot-Electron Generation to High-Power, Kilojoule-Class Laser-Solid Interactions journal December 2010
Target-heating effects on the Kα1,2-emission spectrum from solid targets heated by laser-generated hot electrons journal April 2011
Time-resolved K α spectroscopy measurements of hot-electron equilibration dynamics in thin-foil solid targets: collisional and collective effects journal September 2015
A streaked X-ray spectroscopy platform for rapidly heated, near-solid density plasmas journal August 2016

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