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Area of Science:

  • Laser-plasma interactions
  • Plasma physics
  • High-energy-density physics

Background:

  • Ion acceleration via laser-driven plasma channels is a key area in high-energy-density physics.
  • Plasma instabilities like filamentation and hosing can disrupt laser propagation and energy deposition.
  • Nonlinear coherent structures, such as vortices and postsolitons, can form in laser-plasma interactions.

Purpose of the Study:

  • To investigate the role of plasma instabilities and nonlinear structures in preventing ion acceleration.
  • To explore methods for controlling these instabilities through plasma density tailoring.
  • To demonstrate an experimental setup for studying coherent structures and their impact on ion acceleration.

Main Methods:

  • Laser-plasma experiments using ultrashort laser pulses.
  • Analysis of plasma channel formation and evolution.
  • Observation and characterization of plasma instabilities (filamentation, hosing).
  • Identification of nonlinear coherent structures (vortices, postsolitons).
  • Tailoring of longitudinal plasma density ramps.

Main Results:

  • Ion acceleration was prevented by the onset of multiple plasma instabilities and nonlinear coherent structures.
  • Laser pulse energy was depleted into these structures under specific conditions (plasma density ~10% critical density, gradient ~250 μm).
  • Control over instability onset was achieved by tailoring the plasma density ramp.

Conclusions:

  • Plasma instabilities and nonlinear structures significantly hinder ion acceleration from laser-driven plasma channels.
  • Precise control of plasma density gradients is crucial for managing these instabilities.
  • A long-pulse experimental setup can generate isolated coherent structures for further research into polarimetry and ion acceleration efficiency.