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Title: X-ray-line coincidence photopumping in a potassium-chlorine mixed plasma

Abstract

Exploiting the multiple long pulse capability and suite of x-ray diagnostics of the Orion laser, we have set out to explore line coincidence photopuming—the enhancement in population of an atomic level brought on by resonant absorption of x rays from a different emitting ion. Unlike previous work, the two ions are in the same plasma and so the experiment is an x-ray analog of the well-known Bowen resonance fluorescence mechanism that operates in astrophysical situations in the optical region. Herein, our measurements have shown enhanced fluorescence in a chlorine plasma, attributable to line coincident photopumping from co-mixed potassium ions. To detect this relatively low signal-to-noise phenomenon, the data from multiple shots are combined, and the statistical method of bootstrapping is used to assign a confidence value to the measured enhancement, resulting in an estimate of the enhancement of 39 ± 18 16 % compared to the null case, where no pumping occurs. The experimental results have been compared to coupled radiation-transport and radiation hydrodynamics simulations using the CRETIN code together with the NYM radiation hydrodynamics model and agreement has been found, with the simulations also predicting modest enhancement.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [2]; ORCiD logo [3]; ORCiD logo [3];  [3]; ORCiD logo [4]
  1. AWE Plc., Aldermaston (United Kingdom)
  2. Univ. of Oxford (United Kingdom). Clarendon Lab.
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Imperial College London (United Kingdom). The Blackett Lab.; Univ. of Oxford (United Kingdom). Clarendon Lab.
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1779581
Report Number(s):
LLNL-JRNL-821544
Journal ID: ISSN 2469-9926; 1033112; TRN: US2209665
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review A
Additional Journal Information:
Journal Volume: 101; Journal Issue: 5; Journal ID: ISSN 2469-9926
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; Atomic spectra; dark matter; x-ray astronomy; x-ray generation in plasmas

Citation Formats

Hobbs, L. R., Burridge, D., Hill, M. P., Hoarty, D. J., Brown, C. D., Charles, R., Cooper, G., James, S. F., Wilson, L. A., Babbage, W., Hatfield, P. W., Beiersdorfer, P., Nilsen, J., Scott, H., and Rose, S. J. X-ray-line coincidence photopumping in a potassium-chlorine mixed plasma. United States: N. p., 2020. Web. doi:10.1103/physreva.101.053431.
Hobbs, L. R., Burridge, D., Hill, M. P., Hoarty, D. J., Brown, C. D., Charles, R., Cooper, G., James, S. F., Wilson, L. A., Babbage, W., Hatfield, P. W., Beiersdorfer, P., Nilsen, J., Scott, H., & Rose, S. J. X-ray-line coincidence photopumping in a potassium-chlorine mixed plasma. United States. https://doi.org/10.1103/physreva.101.053431
Hobbs, L. R., Burridge, D., Hill, M. P., Hoarty, D. J., Brown, C. D., Charles, R., Cooper, G., James, S. F., Wilson, L. A., Babbage, W., Hatfield, P. W., Beiersdorfer, P., Nilsen, J., Scott, H., and Rose, S. J. Thu . "X-ray-line coincidence photopumping in a potassium-chlorine mixed plasma". United States. https://doi.org/10.1103/physreva.101.053431. https://www.osti.gov/servlets/purl/1779581.
@article{osti_1779581,
title = {X-ray-line coincidence photopumping in a potassium-chlorine mixed plasma},
author = {Hobbs, L. R. and Burridge, D. and Hill, M. P. and Hoarty, D. J. and Brown, C. D. and Charles, R. and Cooper, G. and James, S. F. and Wilson, L. A. and Babbage, W. and Hatfield, P. W. and Beiersdorfer, P. and Nilsen, J. and Scott, H. and Rose, S. J.},
abstractNote = {Exploiting the multiple long pulse capability and suite of x-ray diagnostics of the Orion laser, we have set out to explore line coincidence photopuming—the enhancement in population of an atomic level brought on by resonant absorption of x rays from a different emitting ion. Unlike previous work, the two ions are in the same plasma and so the experiment is an x-ray analog of the well-known Bowen resonance fluorescence mechanism that operates in astrophysical situations in the optical region. Herein, our measurements have shown enhanced fluorescence in a chlorine plasma, attributable to line coincident photopumping from co-mixed potassium ions. To detect this relatively low signal-to-noise phenomenon, the data from multiple shots are combined, and the statistical method of bootstrapping is used to assign a confidence value to the measured enhancement, resulting in an estimate of the enhancement of 39±1816% compared to the null case, where no pumping occurs. The experimental results have been compared to coupled radiation-transport and radiation hydrodynamics simulations using the CRETIN code together with the NYM radiation hydrodynamics model and agreement has been found, with the simulations also predicting modest enhancement.},
doi = {10.1103/physreva.101.053431},
journal = {Physical Review A},
number = 5,
volume = 101,
place = {United States},
year = {Thu May 21 00:00:00 EDT 2020},
month = {Thu May 21 00:00:00 EDT 2020}
}

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