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Title: Lineshape measurements of He- β spectra on the ORION laser facility

Here, we have utilized a newly developed high-resolution X-ray spectrometer to measure the shapes of spectral lines produced from laser-irradiated targets on the Orion laser facility in the United Kingdom. We present measurements of the He-β spectra of chlorine and chromium from targets irradiated by either a long-pulse or a short-pulse laser beam. The experimental conditions provide a spread in plasma density ranging from about 10 19 to about 10 24 cm –3. We present spectral calculations that show that the relative intensities of the Li-like satellite lines can be used to infer the density in the lower range, especially if the lithiumlike satellite lines are well resolved. In addition, we use the Stark-broadened width of the He-β line to infer densities above about 10 22 cm –3. In the case of a short-pulse irradiated chromium foil, we find that the He-like chromium is produced at a density of almost 8 g/cm 3, i.e., solid density. In addition, we can infer the electron temperature from the observation of dielectronic recombination satellite lines.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [2] ;  [2] ; ORCiD logo [2] ;  [2] ; ORCiD logo [2] ;  [2] ;  [3] ;  [4]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. AWE plc, Reading (United Kingdom)
  3. Vienna International Centre, Vienna (Austria)
  4. Imperial College, London (United Kingdom)
Publication Date:
Report Number(s):
LLNL-JRNL-695535
Journal ID: ISSN 1070-664X
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 10; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 70 PLASMA PHYSICS AND FUSION
OSTI Identifier:
1411700
Alternate Identifier(s):
OSTI ID: 1421103

Beiersdorfer, P., Brown, G. V., Shepherd, R., Allan, P., Brown, C. R. D., Hill, M. P., Hoarty, D. J., Hobbs, L. M. R., James, S. F., Chung, H. K., and Hill, E.. Lineshape measurements of He-β spectra on the ORION laser facility. United States: N. p., Web. doi:10.1063/1.4965233.
Beiersdorfer, P., Brown, G. V., Shepherd, R., Allan, P., Brown, C. R. D., Hill, M. P., Hoarty, D. J., Hobbs, L. M. R., James, S. F., Chung, H. K., & Hill, E.. Lineshape measurements of He-β spectra on the ORION laser facility. United States. doi:10.1063/1.4965233.
Beiersdorfer, P., Brown, G. V., Shepherd, R., Allan, P., Brown, C. R. D., Hill, M. P., Hoarty, D. J., Hobbs, L. M. R., James, S. F., Chung, H. K., and Hill, E.. 2016. "Lineshape measurements of He-β spectra on the ORION laser facility". United States. doi:10.1063/1.4965233. https://www.osti.gov/servlets/purl/1411700.
@article{osti_1411700,
title = {Lineshape measurements of He-β spectra on the ORION laser facility},
author = {Beiersdorfer, P. and Brown, G. V. and Shepherd, R. and Allan, P. and Brown, C. R. D. and Hill, M. P. and Hoarty, D. J. and Hobbs, L. M. R. and James, S. F. and Chung, H. K. and Hill, E.},
abstractNote = {Here, we have utilized a newly developed high-resolution X-ray spectrometer to measure the shapes of spectral lines produced from laser-irradiated targets on the Orion laser facility in the United Kingdom. We present measurements of the He-β spectra of chlorine and chromium from targets irradiated by either a long-pulse or a short-pulse laser beam. The experimental conditions provide a spread in plasma density ranging from about 1019 to about 1024 cm–3. We present spectral calculations that show that the relative intensities of the Li-like satellite lines can be used to infer the density in the lower range, especially if the lithiumlike satellite lines are well resolved. In addition, we use the Stark-broadened width of the He-β line to infer densities above about 1022 cm–3. In the case of a short-pulse irradiated chromium foil, we find that the He-like chromium is produced at a density of almost 8 g/cm3, i.e., solid density. In addition, we can infer the electron temperature from the observation of dielectronic recombination satellite lines.},
doi = {10.1063/1.4965233},
journal = {Physics of Plasmas},
number = 10,
volume = 23,
place = {United States},
year = {2016},
month = {10}
}