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Enhanced relativistic-electron beam collimation using two consecutive laser pulses.

Sophia Malko1,2, Xavier Vaisseau3, Frederic Perez4

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This study explores controlling relativistic electron beams (REBs) using a double laser pulse technique. Optimizing laser focus and timing effectively collimates REBs by leveraging self-generated magnetic fields.

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Area of Science:

  • Plasma Physics
  • Laser-Plasma Interactions
  • High-Energy-Density Physics

Background:

  • Relativistic electron beams (REBs) are crucial for various applications.
  • Efficient collimation of REBs in solid targets remains a challenge.
  • Laser-driven REBs offer a pathway for compact particle sources.

Purpose of the Study:

  • To investigate the double laser pulse technique for REB collimation in solid targets.
  • To understand the influence of laser parameters on REB focusing.
  • To evaluate the effectiveness of magnetic field guiding for REB collimation.

Main Methods:

  • Utilized a double collinear laser pulse scheme focused onto a solid target.
  • Varied intensity ratio and time delay between the two laser pulses.
  • Employed Cu-Kα and Counter-streaming Two-plasmas (CTR) imaging diagnostics to analyze REB components.

Main Results:

  • Demonstrated control over REB collimation by adjusting laser focus size ratio and time delay.
  • Identified a clear dependence of maximum REB collimation on laser focal spot size ratio.
  • Correlated collimation effects with the dynamics of the generated magnetic field.

Conclusions:

  • The double laser pulse approach provides a viable method for controlling REB collimation.
  • Magnetic field generation and dynamics play a critical role in guiding REBs.
  • Optimizing laser parameters enables tailored REB focusing for specific applications.