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Title: Ultrafast electron kinetics in short pulse laser-driven dense hydrogen

Dense cryogenic hydrogen is heated by intense femtosecond infrared laser pulses at intensities of $${10}^{15}-{10}^{16}\;$$ W cm–2. Three-dimensional particle-in-cell (PIC) simulations predict that this heating is limited to the skin depth, causing an inhomogeneously heated outer shell with a cold core and two prominent temperatures of about $25$ and $$40\;\mathrm{eV}$$ for simulated delay times up to $$+70\;\mathrm{fs}$$ after the laser pulse maximum. Experimentally, the time-integrated emitted bremsstrahlung in the spectral range of 8–18 nm was corrected for the wavelength-dependent instrument efficiency. The resulting spectrum cannot be fit with a single temperature bremsstrahlung model, and the best fit is obtained using two temperatures of about 13 and $$30\;$$eV. The lower temperatures in the experiment can be explained by missing energy-loss channels in the simulations, as well as the inclusion of hot, non-Maxwellian electrons in the temperature calculation. In conclusion, we resolved the time-scale for laser-heating of hydrogen, and PIC results for laser–matter interaction were successfully tested against the experiment data.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [4] ;  [5] ;  [4] ;  [6] ;  [7] ;  [6] ;  [8] ;  [9] ;  [10] ;  [11] ;  [6] ;  [5] ;  [4] ;  [8] ;  [12] more »;  [13] ;  [14] ;  [15] ;  [4] ;  [4] ;  [15] ;  [16] ;  [6] ;  [4] ;  [13] « less
  1. European XFEL, Hamburg (Germany); Friedrich-Schiller-Univ., Jena (Germany)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. Rostock, Rostock (Germany)
  3. Quantum Wise A/S, Copenhagen (Denmark)
  4. Univ. Rostock, Rostock (Germany)
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  6. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  7. Friedrich-Schiller-Univ., Jena (Germany); Helmholtz-Institut Jena, Jena (Germany)
  8. Univ. of Oxford, Oxford (United Kingdom)
  9. Institut de mineralogie, Paris (France); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  10. Friedrich-Schiller-Univ., Jena (Germany)
  11. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany); The Hamburg Centre for Ultrafast Imaging CUI, Hamburg (Germany)
  12. Univ. of Edinburgh, Edinburgh (United Kingdom)
  13. European XFEL, Hamburg (Germany)
  14. Extreme Matter Institute, GSI Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  15. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  16. Imperial College, London (United Kingdom)
Publication Date:
OSTI Identifier:
1249381
Report Number(s):
SLAC-PUB--16138
Journal ID: ISSN 0953-4075
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Journal of Physics. B, Atomic, Molecular and Optical Physics
Additional Journal Information:
Journal Volume: 48; Journal Issue: 22; Journal ID: ISSN 0953-4075
Publisher:
IOP Publishing
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 43 PARTICLE ACCELERATORS PHYS; OPTICS; electron collision; emission; absorption; scattering of electromagnetic radiation; plasma production; heating by laser beams