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Title: Measurement and simulation of the temperature evolution of a short pulse laser heated buried layer target

Short pulse laser heated buried layers experiments have been performed on the Orion laser facility to study the time-resolved emission characteristics of plasmas with mass densities ≥ 1 g/cc and electron temperatures > 500 eV. Our streak camera measurements focused on the K-shell emission lines of He-like and H-like aluminum from a buried aluminum layer. The data were analyzed by comparison to synthetic spectra generated with the non-local thermodynamic equilibrium (NLTE) radiation transfer code Cretin, which yielded maximum temperatures of nearly 800 eV at near solid density. The time precise history of the temperature evolution was reproduced with a 1-D radiation hydrodynamic code; however, the known effect of lateral transport of energy out of the focal spot made exacting agree with theory difficult. Furthermore, we have observed densities of ≥ 1 g/cc and temperatures of > 500 eV using the 1-D analysis, which supports the idea that the aluminum plasma is locally hotter than inferred from our spatially integrating measurements and that modeling requires the inclusion of 2-dimensional effects.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Atomic Weapons Establishment, Aldermaston (United Kingdom)
Publication Date:
Report Number(s):
LLNL-JRNL-736647
Journal ID: ISSN 1574-1818; 889378
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
High Energy Density Physics
Additional Journal Information:
Journal Volume: 25; Journal Issue: C; Journal ID: ISSN 1574-1818
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; High-density plasma; Short pulse laser; X-ray spectroscopy
OSTI Identifier:
1463018

Marley, E. V., Shepherd, R., Beiersdorfer, P., Brown, G., Chen, H., Dunn, J., Foord, M., Scott, H., London, R., Steel, A. B., Hoarty, D., James, S., Brown, C. R. D., Hill, M., Allan, P., and Hobbs, L.. Measurement and simulation of the temperature evolution of a short pulse laser heated buried layer target. United States: N. p., Web. doi:10.1016/j.hedp.2017.09.002.
Marley, E. V., Shepherd, R., Beiersdorfer, P., Brown, G., Chen, H., Dunn, J., Foord, M., Scott, H., London, R., Steel, A. B., Hoarty, D., James, S., Brown, C. R. D., Hill, M., Allan, P., & Hobbs, L.. Measurement and simulation of the temperature evolution of a short pulse laser heated buried layer target. United States. doi:10.1016/j.hedp.2017.09.002.
Marley, E. V., Shepherd, R., Beiersdorfer, P., Brown, G., Chen, H., Dunn, J., Foord, M., Scott, H., London, R., Steel, A. B., Hoarty, D., James, S., Brown, C. R. D., Hill, M., Allan, P., and Hobbs, L.. 2017. "Measurement and simulation of the temperature evolution of a short pulse laser heated buried layer target". United States. doi:10.1016/j.hedp.2017.09.002. https://www.osti.gov/servlets/purl/1463018.
@article{osti_1463018,
title = {Measurement and simulation of the temperature evolution of a short pulse laser heated buried layer target},
author = {Marley, E. V. and Shepherd, R. and Beiersdorfer, P. and Brown, G. and Chen, H. and Dunn, J. and Foord, M. and Scott, H. and London, R. and Steel, A. B. and Hoarty, D. and James, S. and Brown, C. R. D. and Hill, M. and Allan, P. and Hobbs, L.},
abstractNote = {Short pulse laser heated buried layers experiments have been performed on the Orion laser facility to study the time-resolved emission characteristics of plasmas with mass densities ≥ 1 g/cc and electron temperatures > 500 eV. Our streak camera measurements focused on the K-shell emission lines of He-like and H-like aluminum from a buried aluminum layer. The data were analyzed by comparison to synthetic spectra generated with the non-local thermodynamic equilibrium (NLTE) radiation transfer code Cretin, which yielded maximum temperatures of nearly 800 eV at near solid density. The time precise history of the temperature evolution was reproduced with a 1-D radiation hydrodynamic code; however, the known effect of lateral transport of energy out of the focal spot made exacting agree with theory difficult. Furthermore, we have observed densities of ≥ 1 g/cc and temperatures of > 500 eV using the 1-D analysis, which supports the idea that the aluminum plasma is locally hotter than inferred from our spatially integrating measurements and that modeling requires the inclusion of 2-dimensional effects.},
doi = {10.1016/j.hedp.2017.09.002},
journal = {High Energy Density Physics},
number = C,
volume = 25,
place = {United States},
year = {2017},
month = {9}
}