Observation of ionization trends in a laboratory photoionized plasma experiment at Z
- Univ. of Nevada, Reno, NV (United States)
- Univ. of Nevada, Reno, NV (United States); Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
We report experimental and modeling results for the charge state distribution of laboratory photoionized neon plasmas in the first systematic study over nearly an order of magnitude range of ionization parameter ξ ∝ F/Ne. The range of ξ is achieved by flexibility in the experimental platform to adjust either the x-ray drive flux F at the sample or the electron number density Ne or both. Experimental measurements of photoionized plasma conditions over such a range of parameters enable a stringent test of atomic kinetics models used within codes that are applied to photoionized plasmas in the laboratory and astrophysics. From experimental transmission data, ion areal densities are extracted by spectroscopic analysis that is independent of atomic kinetics modeling. The measurements reveal the net result of the competition between photon-driven ionization and electron-driven recombination atomic processes as a function of ξ as it affects the charge state distribution. Results from radiation-hydrodynamics modeling calculations with detailed inline atomic kinetics modeling are compared with the experimental results. There is good agreement in the mean charge and overall qualitative similarities in the trends observed with ξ but significant quantitative differences in the fractional populations of individual ions.
- Research Organization:
- Univ. of Nevada, Reno, NV (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- NA0003875; SC0014451; NA0003843; NA0003525; AC52-07NA27344
- OSTI ID:
- 1822256
- Alternate ID(s):
- OSTI ID: 1834760; OSTI ID: 1868167; OSTI ID: 1970608
- Report Number(s):
- LLNL-JRNL-834935; TRN: US2214448
- Journal Information:
- Physical Review E, Vol. 104, Issue 3; ISSN 2470-0045
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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