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  • Helium as a Surrogate for Deuterium in LPI Studies

  • Matthias Geissel, Adam J. Harvey-Thompson, Matthew R. Weis, Jeffrey R. Fein, David Ampleford, David E. Bliss, Aaron M. Hansen, Christopher Jennings, Mark W. Kimmel, Patrick Rambo, Jonathon E. Shores, Ian C. Smith, C. Shane Speas, John L. Porter, Fabrizio Consoli
  • Journal:
    Laser and Particle Beams / Volume 2023 / 2023
    Published online by Cambridge University Press:
    01 January 2024, e2
    • Article
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  • Helium or neopentane can be used as surrogate gas fill for deuterium (D2) or deuterium-tritium (DT) in laser-plasma interaction studies. Surrogates are convenient to avoid flammability hazards or the integration of cryogenics in an experiment. To test the degree of equivalency between deuterium and helium, experiments were conducted in the Pecos target chamber at Sandia National Laboratories. Observables such as laser propagation and signatures of laser-plasma instabilities (LPI) were recorded for multiple laser and target configurations. It was found that some observables can differ significantly despite the apparent similarity of the gases with respect to molecular charge and weight. While a qualitative behaviour of the interaction may very well be studied by finding a suitable compromise of laser absorption, electron density, and LPI cross sections, a quantitative investigation of expected values for deuterium fills at high laser intensities is not likely to succeed with surrogate gases.

The Second Part of King Henry IV
  • 2nd edition
  • William Shakespeare
  • Edited by Giorgio Melchiori
  • With contributions by Adam Hansen
  • Published online:
    16 August 2019
    Print publication:
    03 May 2007
  • The New Cambridge Shakespeare appeals to students worldwide for its up-to-date scholarship and emphasis on performance. The series features line-by-line commentaries and textual notes on the plays and poems. Introductions are regularly refreshed with accounts of new critical, stage and screen interpretations. This second edition retains Giorgio Melchiori's text of Shakespeare's The Second Part of King Henry IV. Melchiori argues that the play forms an unplanned sequel to the First Part, itself a 'remake' of an old, non-Shakespearean play. In the Second Part, Shakespeare deliberately exploits Falstaff's popular appeal and the resulting rich humour adds a comic dimension to the play, rendering it a unique blend of history, morality play and comedy. Among modern editions, Melchiori's is the one most firmly based on the quarto. This second edition includes a new section by Adam Hansen on recent stage, film and critical interpretations.

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