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Related Experiment Videos

Soft-x-ray emission dynamics in picosecond laser-produced plasmas

Gizzi1, Giulietti, Willi

  • 1Istituto di Fisica Atomica e Molecolare, Area della Ricerca del CNR, 56010 Ghezzano, Pisa, Italy.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|November 23, 2000
PubMed
Summary

Picosecond laser experiments reveal plasma dynamics in fluorine salts. Emission intensity peaks rapidly, followed by decay influenced by target material, indicating radiation cooling in higher-atomic-number targets.

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Area of Science:

  • Plasma physics
  • Atomic physics
  • Laser-matter interaction

Background:

  • Understanding plasma evolution is crucial for applications like inertial confinement fusion.
  • Fluorine salts offer a unique medium for studying laser-produced plasmas.
  • K-shell emission provides insights into high-temperature plasma conditions.

Purpose of the Study:

  • Investigate temporal evolution of plasma parameters using picosecond laser irradiation.
  • Analyze K-shell emission from H-like and He-like fluorine.
  • Determine the influence of target composition on plasma decay dynamics.

Main Methods:

  • Generated plasmas using prepulse-free picosecond laser irradiation of five different fluorine salts.
  • Employed picosecond-time-resolved X-ray spectroscopy.

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  • Measured K-shell emission from H-like and He-like fluorine ions.

    • Main Results:

    • Fluorine line emission intensity peaked rapidly, comparable to laser pulse rise time.
    • Emission decay rate correlated with the atomic number of the alkali component.
    • Observed clear evidence of radiation cooling effects in targets with higher atomic numbers (higher-Z).

    Conclusions:

    • Plasma parameters evolve rapidly following picosecond laser excitation.
    • The decay dynamics are significantly influenced by radiative processes, particularly in high-Z targets.
    • Radiation cooling is a key mechanism affecting plasma evolution in these fluorine salt systems.