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Ablating Ion Velocity Distributions in Short-Pulse-Heated Solids via X-Ray Doppler Shifts.

Author information

Affiliations

  • 1. Department of Astrophysical Sciences, Princeton University, Princeton, 08544 New Jersey, USA.
      Authors
    • Kraus BF 1, 2
    (1 author)
  • 2. Princeton Plasma Physics Laboratory, Princeton University, Princeton, 08540 New Jersey, USA.
      Authors
    • Kraus BF 1, 2
    • Gao L 2
    • Fox W 2
    • Hill KW 2
    • Bitter M 2
    • Efthimion PC 2
    (6 authors)
  • 3. Electrical and Computer Engineering Department, Colorado State University, Fort Collins, 80523 Colorado, USA.
      Authors
    • Moreau A 3
    • Hollinger R 3
    • Wang S 3
    • Song H 3
    • Rocca JJ 3
    (5 authors)

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Physical Review Letters, 01 Dec 2022, 129(23):235001
https://doi.org/10.1103/physrevlett.129.235001 PMID: 36563203 

Abstract 

Solids ablate under laser irradiation, but experiments have not previously characterized the initiation of this process at ultrarelativistic laser intensities. We present first measurements of bulk ion velocity distributions as ablation begins, captured as a function of depth via Doppler-shifted x-ray line emission from two viewing angles. Bayesian analysis indicates that bulk ions are either nearly stationary or flowing outward at the plasma sound speed. The measurements quantitatively constrain the laser-plasma ablation mechanism, suggesting that a steplike electrostatic potential structure drives solid disassembly.

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Read article at publisher's site: https://doi.org/10.1103/physrevlett.129.235001

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Funding 

Funders who supported this work.

Fusion Energy Sciences (1)

Lawrence Livermore National Laboratory (1)

Office of Naval Research (1)

Office of Science

    Princeton Plasma Physics Laboratory (1)

    U.S. Department of Energy

      University of Chicago