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Investigation of femtosecond collisional ionization rates in a solid-density aluminium plasma

Author

Listed:
  • S. M. Vinko

    (Clarendon Laboratory, University of Oxford)

  • O. Ciricosta

    (Clarendon Laboratory, University of Oxford)

  • T. R. Preston

    (Clarendon Laboratory, University of Oxford)

  • D. S. Rackstraw

    (Clarendon Laboratory, University of Oxford)

  • C.R.D. Brown

    (AWE Aldermaston)

  • T. Burian

    (Institute of Physics ASCR)

  • J. Chalupský

    (Institute of Physics ASCR)

  • B. I. Cho

    (Center for Relativistic Laser Science, Institute for Basic Science (IBS)
    Gwangju Institute of Science and Technology)

  • H.-K. Chung

    (Atomic and Molecular Data Unit, Nuclear Data Section, IAEA)

  • K. Engelhorn

    (Lawrence Berkeley National Laboratory)

  • R. W. Falcone

    (Lawrence Berkeley National Laboratory
    University of California)

  • R. Fiokovinini

    (Clarendon Laboratory, University of Oxford)

  • V. Hájková

    (Institute of Physics ASCR)

  • P. A. Heimann

    (SLAC National Accelerator Laboratory)

  • L. Juha

    (Institute of Physics ASCR)

  • H. J. Lee

    (SLAC National Accelerator Laboratory)

  • R. W. Lee

    (University of California)

  • M. Messerschmidt

    (National Science Foundation BioXFEL Science and Technology Center)

  • B. Nagler

    (SLAC National Accelerator Laboratory)

  • W. Schlotter

    (SLAC National Accelerator Laboratory)

  • J. J. Turner

    (SLAC National Accelerator Laboratory)

  • L. Vysin

    (Institute of Physics ASCR)

  • U. Zastrau

    (IOQ, Friedrich-Schiller-Universität Jena)

  • J. S. Wark

    (Clarendon Laboratory, University of Oxford)

Abstract

The rate at which atoms and ions within a plasma are further ionized by collisions with the free electrons is a fundamental parameter that dictates the dynamics of plasma systems at intermediate and high densities. While collision rates are well known experimentally in a few dilute systems, similar measurements for nonideal plasmas at densities approaching or exceeding those of solids remain elusive. Here we describe a spectroscopic method to study collision rates in solid-density aluminium plasmas created and diagnosed using the Linac Coherent light Source free-electron X-ray laser, tuned to specific interaction pathways around the absorption edges of ionic charge states. We estimate the rate of collisional ionization in solid-density aluminium plasmas at temperatures ~30 eV to be several times higher than that predicted by standard semiempirical models.

Suggested Citation

  • S. M. Vinko & O. Ciricosta & T. R. Preston & D. S. Rackstraw & C.R.D. Brown & T. Burian & J. Chalupský & B. I. Cho & H.-K. Chung & K. Engelhorn & R. W. Falcone & R. Fiokovinini & V. Hájková & P. A. He, 2015. "Investigation of femtosecond collisional ionization rates in a solid-density aluminium plasma," Nature Communications, Nature, vol. 6(1), pages 1-7, May.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7397
    DOI: 10.1038/ncomms7397
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