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Area of Science:

  • Plasma physics
  • Particle acceleration
  • Accelerator physics

Background:

  • Plasma wakefield acceleration (PWFA) offers a pathway to higher accelerating gradients compared to conventional accelerators.
  • Hollow or donut-shaped electron beams are proposed as drivers for PWFA, potentially overcoming limitations of traditional driver profiles.

Purpose of the Study:

  • To investigate the feasibility of positron acceleration using hollow electron driver beams in a plasma.
  • To determine the achievable accelerating gradients and energy gain for positrons under these conditions.

Main Methods:

  • Particle-in-cell simulations were employed to model the interaction of a hollow electron beam with a plasma.
  • Analysis focused on the resulting electric fields and their impact on a trailing positron beam.

Main Results:

  • A hollow electron beam creates an electron-free region, establishing favorable accelerating and focusing fields for positrons.
  • Accelerating gradients of approximately 10 GV/m were achieved for Facility for Advanced Accelerator Experimental Tests (FACET)-like parameters.
  • Simulations demonstrated the acceleration of a 23-GeV positron beam to 35.4 GeV with low energy spread (0.4%) and emittance over 140 cm.

Conclusions:

  • Hollow electron beams are a promising driver configuration for efficient positron plasma wakefield acceleration.
  • The study confirms the potential for high-gradient acceleration and precise beam control in PWFA schemes.