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Related Experiment Videos

Laser-accelerated protons with energy-dependent beam direction.

F Lindau1, O Lundh, A Persson

  • 1Department of Physics, Lund Institute of Technology, P.O. Box 118, S-22100 Lund, Sweden.

Physical Review Letters
|December 31, 2005
PubMed
Summary
This summary is machine-generated.

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Proton beams from laser-driven targets deviate from the target normal. This deviation, influenced by laser pulse characteristics and proton energy, is explained by electron acceleration and shock wave dynamics.

Area of Science:

  • Plasma Physics
  • Laser-Induced Acceleration
  • Particle Beams

Background:

  • Intense femtosecond laser pulses interacting with thin foils generate high-energy proton beams.
  • Understanding proton beam spatial distribution is crucial for applications in particle acceleration and fusion energy.

Purpose of the Study:

  • Investigate the spatial distribution of laser-accelerated protons.
  • Analyze the factors influencing proton beam deviation from the target normal.

Main Methods:

  • Experimental study of proton beams generated by femtosecond laser pulses interacting with thin foils.
  • Oblique irradiation of targets to observe beam dynamics.

Main Results:

  • Proton beams were observed to deviate from the target normal, directing towards the laser forward direction.

Related Experiment Videos

  • Beam deviation angle increases with amplified spontaneous emission pedestal level and duration.
  • Proton beam deviation also increases with proton energy for a given laser pulse.

    • Conclusions:

    • The observed proton beam deviation is attributed to a combination of electron acceleration mechanisms and target normal sheath acceleration.
    • Laser-induced shock waves locally deforming the target rear surface play a significant role.