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Area of Science:

  • Particle Physics
  • Accelerator Physics
  • Plasma Physics

Background:

  • Conventional accelerators face energy limits due to electrical breakdown.
  • Plasma wakefield accelerators (PWFA) offer a path to higher energies and more compact, affordable colliders.
  • Efficient acceleration of both electrons and positrons is crucial for electron-positron colliders.

Purpose of the Study:

  • To demonstrate a novel PWFA regime suitable for accelerating positrons.
  • To enable efficient energy transfer within a single positron bunch for collider applications.

Main Methods:

  • A single positron bunch excites a plasma wakefield.
  • Energy transfer occurs from the front to the rear of the same bunch.
  • The accelerating field is 'self-loaded' by the positron bunch.

Main Results:

  • Approximately one billion positrons gained 5 GeV of energy over 1.3 meters.
  • Positrons achieved a narrow energy spread (1.8% RMS).
  • About 30% of the wake's energy was extracted by the positrons.

Conclusions:

  • This self-loading PWFA regime efficiently accelerates positrons.
  • The method is highly attractive for boosting energies in electron-positron colliders.
  • Enables compact and cost-effective future particle accelerators.